subject:(Digital Image Correlation Method)

1. Molteno, Matthew Robert. Measuring fracture properties using digital image and volume correlation: decomposing the J-integral for mixed-mode parameters.

Degree: PhD, Mechanical and Mechatronic Engineering, 2017, Stellenbosch University

URL: http://hdl.handle.net/10019.1/102804

► ENGLISH ABSTRACT: The degradation of material properties over time is one of the core constituents of structural integrity monitoring. For this purpose, the materials’ resistance… (more)

▼ ENGLISH ABSTRACT: The degradation of material properties over time is one of the core constituents of structural integrity monitoring. For this purpose, the materials’ resistance to brittle fracture is the most widely used property in the determination of safe operation and predicting component life. Measuring such properties by conventional methods presents challenges: large numbers of samples are needed, accounting for mixed-mode loading. Non-contact measurements by digital image correlation shows promise in extracting such parameters from in situ loaded structures, accounting for their complex geometry and loading. This thesis aims to develop a framework that allows for the extraction of mixed-mode brittle fracture properties, using three-dimensional (3D) image correlation techniques: multi-camera Digital Image Correlation (stereo-DIC), and Digital Volume Correlation (DVC). The 𝐽-integral method was chosen for obtaining the fracture resistance, with the decomposition method used for determining separate 𝐽𝐼−𝐼𝐼𝐼 components (opening, sliding and shearing: modes I, II and III), and stress intensity factors (𝐾𝐼−𝐼𝐼𝐼), as both methods are resilient to crack tip and displacement errors. The first stage of development is a finite element based method for the removal of experimental displacement artifacts from DIC or DVC results, intended as a pre-processor for the 𝐽-integral. Subsequently, a theoretical derivation is provided to link the two volumetric forms: the volume and the path-area integrals. This results in a proposed ‘hybrid’ integral, which benefits from the resilience to crack-front positional errors of the path-area approach, and resilience to random displacement noise of the volume integral. Initial testing of the 𝐽-integral based decomposition method was on the surface using stereo-DIC and the Arcan fixture to induce mixed-mode loading. The results are verified with mixed-mode fracture toughness values measured from PMMA and compared to literature and ASTM 1820 tests. The typical image correlation errors close to fracture are quantified by a methodology of applying the 𝐽-integral to analytical crack tip fields to which displacement errors are added artificially. It was found that the 𝐽-integral is most prone to DIC errors under anti-symmetric (mode II/III) loading. Testing in the volume used X-ray computed tomography to acquire images and DVC for displacement maps. The measurements were verified on two configurations: a SENT polyurethane composite specimen (mode I), and a shear loaded inclined notch in Magnesium alloy-WE43 (mixed-mode). The 𝐽-integral was verified against values from finite element fields resulting again in larger errors in mixed-loading. Decomposition of the volume integral requires an approach to separate the anti-symmetric 𝐽-integral. Two extensions are proposed: the first using a ratio derived from mode II/III Williams series formulas, and the second using the interaction integral. Both approaches are verified on DVC displacements. This thesis finds that 𝐽 based decomposition offers a… Advisors/Committee Members: Becker, Thorsten Hermann, Stellenbosch University. Faculty of Engineering. Dept. of Mechanical and Mechatronic Engineering..

Subjects/Keywords: Decomposition method; Fracture of materials – Measurement; Digital images; Digital image correlation; UCTD

10 more images…

Record Details Similar Records Cite « Share

❌

APA · Chicago · MLA · Vancouver · CSE | Export to Zotero / EndNote / Reference Manager

APA (6^th Edition):

Molteno, M. R. (2017). Measuring fracture properties using digital image and volume correlation: decomposing the J-integral for mixed-mode parameters. (Doctoral Dissertation). Stellenbosch University. Retrieved from http://hdl.handle.net/10019.1/102804

Chicago Manual of Style (16^th Edition):

Molteno, Matthew Robert. “Measuring fracture properties using digital image and volume correlation: decomposing the J-integral for mixed-mode parameters.” 2017. Doctoral Dissertation, Stellenbosch University. Accessed February 27, 2021. http://hdl.handle.net/10019.1/102804.

MLA Handbook (7^th Edition):

Molteno, Matthew Robert. “Measuring fracture properties using digital image and volume correlation: decomposing the J-integral for mixed-mode parameters.” 2017. Web. 27 Feb 2021.

Vancouver:

Molteno MR. Measuring fracture properties using digital image and volume correlation: decomposing the J-integral for mixed-mode parameters. [Internet] [Doctoral dissertation]. Stellenbosch University; 2017. [cited 2021 Feb 27]. Available from: http://hdl.handle.net/10019.1/102804.

Council of Science Editors:

Molteno MR. Measuring fracture properties using digital image and volume correlation: decomposing the J-integral for mixed-mode parameters. [Doctoral Dissertation]. Stellenbosch University; 2017. Available from: http://hdl.handle.net/10019.1/102804

NSYSU

2. Wang , Jhao-Shun. Analysis of Residual Stress Distribution in ITO Thin Film Coated on Si-Substrate by Applying DIC Technique and Taguchi Method.

Degree: Master, Mechanical and Electro-Mechanical Engineering, 2016, NSYSU

URL: http://etd.lib.nsysu.edu.tw/ETD-db/ETD-search/view_etd?URN=etd-0718116-153028

► In the MEMS process, a thin film is likely to be coated on a substrate. Residual stress is established in the coating upon cooling to… (more)

▼ In the MEMS process, a thin film is likely to be coated on a substrate. Residual stress is established in the coating upon cooling to room temperature because thermal expansion coefficients of the thin film and the substrate are different. The residual stress in the coating not only causes bending but also affects the quality of coating. This thesis discusses the relationship of the residual stress and its distribution with the parameters of the process and the thickness of the ITO thin film that is coated on the Si-substrate. Four parameters of coating process - coating time, sputtering power, working pressure, and argon flow rate â are considered here. In the experiment, each parameter is set to one of three levels, consistent with the Taguchi Method, yielding nine combinations. For each of the nine combinations, three Si-substrates are used. Measurements are made at nine points on each Si-substrate. Two sets of the in-plane displacement of the coating from two different angles of the screen can be measured by using digital image correlation technique. The obtained sets of in-plane displacements can be used to calculate the out-of-plane displacement, the components of residual stress in the x-direction and the y-direction can be calculated using the modified Stoneyâs equation. The equivalent residual stress is calculated from these components of residual stresses, and the coefficient of variation is calculated from the average and standard deviation of the equivalent residual stress at the nine points on the Si-substrate. Finally, the distribution of residual stress in coating is discussed with reference to the experimentally obtained coefficient of variation. The experimental results indicate that the coating time and the sputtering power importantly affect the magnitude of residual stress, but the working pressure and the argon flow rate have very little effect. Additionally, the experimental results show that the residual stress distribution is affected by coating time, sputtering power, argon flow rate and working pressure, in order of declining strength of the effect. The coating time most strongly affects the coating process. As the coating thickness increases, the residual stress decreases and the variation among measurements made of three Si-substrates of same combination declines. Restated, the precision of the experimental measurements improves with the coating thickness, but the distribution of residual stress becomes less uniform. Advisors/Committee Members: T. N. Shiau (chair), Jung-Hung Sun (chair), Chung-Ting Wang (chair), Chi-Hui Chien (committee member).

Subjects/Keywords: Digital Image Correlation Method; Indium Tin Oxide Film; Taguchi Method; Coating Residual Stress; Coating Distribution

Record Details Similar Records Cite « Share

❌

APA · Chicago · MLA · Vancouver · CSE | Export to Zotero / EndNote / Reference Manager

APA (6^th Edition):

Wang , J. (2016). Analysis of Residual Stress Distribution in ITO Thin Film Coated on Si-Substrate by Applying DIC Technique and Taguchi Method. (Thesis). NSYSU. Retrieved from http://etd.lib.nsysu.edu.tw/ETD-db/ETD-search/view_etd?URN=etd-0718116-153028

Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation

Chicago Manual of Style (16^th Edition):

Wang , Jhao-Shun. “Analysis of Residual Stress Distribution in ITO Thin Film Coated on Si-Substrate by Applying DIC Technique and Taguchi Method.” 2016. Thesis, NSYSU. Accessed February 27, 2021. http://etd.lib.nsysu.edu.tw/ETD-db/ETD-search/view_etd?URN=etd-0718116-153028.

Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation

MLA Handbook (7^th Edition):

Wang , Jhao-Shun. “Analysis of Residual Stress Distribution in ITO Thin Film Coated on Si-Substrate by Applying DIC Technique and Taguchi Method.” 2016. Web. 27 Feb 2021.

Vancouver:

Wang J. Analysis of Residual Stress Distribution in ITO Thin Film Coated on Si-Substrate by Applying DIC Technique and Taguchi Method. [Internet] [Thesis]. NSYSU; 2016. [cited 2021 Feb 27]. Available from: http://etd.lib.nsysu.edu.tw/ETD-db/ETD-search/view_etd?URN=etd-0718116-153028.

Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation

Council of Science Editors:

Wang J. Analysis of Residual Stress Distribution in ITO Thin Film Coated on Si-Substrate by Applying DIC Technique and Taguchi Method. [Thesis]. NSYSU; 2016. Available from: http://etd.lib.nsysu.edu.tw/ETD-db/ETD-search/view_etd?URN=etd-0718116-153028

Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation

Univerzitet u Beogradu

3. Balać, Martina M., 1978-. Međusobni uticaj priključaka na stanje napona i deformacija na cilindričnom omotaču posude pod pritiskom.

Degree: Mašinski fakultet, 2016, Univerzitet u Beogradu

URL: https://fedorabg.bg.ac.rs/fedora/get/o:12321/bdef:Content/get

►

Tehničke nauke, mašinstvo - Procesna tehnika / Technical sciences – Mechanical engineering - Procesing technique

Većina istraživača koja se bavi problematikom određivanja i merenja napona… (more)

▼

Tehničke nauke, mašinstvo - Procesna tehnika / Technical sciences – Mechanical engineering - Procesing technique

Većina istraživača koja se bavi problematikom određivanja i merenja napona i deformacija na posudama pod pritiskom, fokusirala se na analizu uticaja jednog priključka na napone i deformacije na posudi. Dosadašnja istraživanja su se oslanjala na analitičke proračune bazirane na teoriji ljuske, numeričke proračune i konvencionalne eksperimentalne metode. Najčešće korišćena konvencionalna metoda je metoda mernih traka. Ograničenja ove metode se ogledaju u lokalnom merenju napona i deformacija, i dobijanju vrednosti izmerene veličine u samo jednoj tački. U okviru ove disertacije sprovedena su eksperimentalna istraživanja, sa ciljem da se pokaže da je moguće primeniti relativno novu metodu digitalne korelacije slika na ispitivanje opreme pod pritiskom. Metoda digitalne korelacije slika omogućava merenja celih polja deformacija, pri čemu se jednim eksperimentalnim merenjem dobija veliki broj podataka koji zamenjuje više desetina mernih traka. Trodimenzionalni optički sistem GOM i softver ARAMIS primenjeni su za izvođenje eksperimentalne analize međusobnog uticaja priključaka na cilindrični omotač posude pod pritiskom, izložene unutrašnjem pritisku. Eksperimentalna istraživanja su obavljena na jednoj posudi pod pritiskom, na čiji su cilindrični omotač sa jedne strane zavarena dva cilindrična priključka, dimenzija DN 50 i DN 32. Sa druge strane omotača pod uglom od 180°, zavarena su dva priključka dimenzija DN 50. Definisana su dva merna mesta. Merno mesto 1 predstavlja oblast između dva priključka različitih dimenzija, a merno mesto 2 predstavlja oblast između dva priključka istih dimenzija. U okviru mernih mesta definisana su i merna polja pomoću kojih se dobija bolja slika o deformacionom polju između priključaka. Eksperimentalno merenje celih polja deformacija omogućava precizno određivanje kritičnih mesta, odnosno mesta najvećih deformacija...

Advisors/Committee Members: Petrović, Aleksandar, 1962-.

Subjects/Keywords: Pressure vessel; nozzles; digital image correlation method; 3D optical analysis; finite element method; strain; stress

Record Details Similar Records Cite « Share

❌

APA · Chicago · MLA · Vancouver · CSE | Export to Zotero / EndNote / Reference Manager

APA (6^th Edition):

Balać, Martina M., 1. (2016). Međusobni uticaj priključaka na stanje napona i deformacija na cilindričnom omotaču posude pod pritiskom. (Thesis). Univerzitet u Beogradu. Retrieved from https://fedorabg.bg.ac.rs/fedora/get/o:12321/bdef:Content/get

Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation

Chicago Manual of Style (16^th Edition):

Balać, Martina M., 1978-. “Međusobni uticaj priključaka na stanje napona i deformacija na cilindričnom omotaču posude pod pritiskom.” 2016. Thesis, Univerzitet u Beogradu. Accessed February 27, 2021. https://fedorabg.bg.ac.rs/fedora/get/o:12321/bdef:Content/get.

Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation

MLA Handbook (7^th Edition):

Balać, Martina M., 1978-. “Međusobni uticaj priključaka na stanje napona i deformacija na cilindričnom omotaču posude pod pritiskom.” 2016. Web. 27 Feb 2021.

Vancouver:

Balać, Martina M. 1. Međusobni uticaj priključaka na stanje napona i deformacija na cilindričnom omotaču posude pod pritiskom. [Internet] [Thesis]. Univerzitet u Beogradu; 2016. [cited 2021 Feb 27]. Available from: https://fedorabg.bg.ac.rs/fedora/get/o:12321/bdef:Content/get.

Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation

Council of Science Editors:

Balać, Martina M. 1. Međusobni uticaj priključaka na stanje napona i deformacija na cilindričnom omotaču posude pod pritiskom. [Thesis]. Univerzitet u Beogradu; 2016. Available from: https://fedorabg.bg.ac.rs/fedora/get/o:12321/bdef:Content/get

Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation

University of Alberta

4. Leung, Cheequn. Examination of Braided Composite Geometric Factors Using Three Dimensional Digital Image Correlation Measurement Techniques.

Degree: MS, Department of Mechanical Engineering, 2012, University of Alberta

URL: https://era.library.ualberta.ca/files/fj2363323

► The objective of this thesis is to develop and validate an optical measurement tool for composite braided structures and use this tool to examine important… (more)

Subjects/Keywords: braided; digital image correlation; composite

Record Details Similar Records Cite « Share

❌

APA · Chicago · MLA · Vancouver · CSE | Export to Zotero / EndNote / Reference Manager

APA (6^th Edition):

Leung, C. (2012). Examination of Braided Composite Geometric Factors Using Three Dimensional Digital Image Correlation Measurement Techniques. (Masters Thesis). University of Alberta. Retrieved from https://era.library.ualberta.ca/files/fj2363323

Chicago Manual of Style (16^th Edition):

Leung, Cheequn. “Examination of Braided Composite Geometric Factors Using Three Dimensional Digital Image Correlation Measurement Techniques.” 2012. Masters Thesis, University of Alberta. Accessed February 27, 2021. https://era.library.ualberta.ca/files/fj2363323.

MLA Handbook (7^th Edition):

Leung, Cheequn. “Examination of Braided Composite Geometric Factors Using Three Dimensional Digital Image Correlation Measurement Techniques.” 2012. Web. 27 Feb 2021.

Vancouver:

Leung C. Examination of Braided Composite Geometric Factors Using Three Dimensional Digital Image Correlation Measurement Techniques. [Internet] [Masters thesis]. University of Alberta; 2012. [cited 2021 Feb 27]. Available from: https://era.library.ualberta.ca/files/fj2363323.

Council of Science Editors:

Leung C. Examination of Braided Composite Geometric Factors Using Three Dimensional Digital Image Correlation Measurement Techniques. [Masters Thesis]. University of Alberta; 2012. Available from: https://era.library.ualberta.ca/files/fj2363323

University of Manchester

5. Aswad, Mohsin Abbas. Residual Stress and Fracture in High Temperature Ceramics.

Degree: 2012, University of Manchester

URL: http://www.manchester.ac.uk/escholar/uk-ac-man-scw:157835

► Recrystallised alumina is used as a high performance crucible material. Its thermal shock resistance is known to be affected by component shape, and also by… (more)

▼ Recrystallised alumina is used as a high performance crucible material. Its thermal shock resistance is known to be affected by component shape, and also by processing variables, since the defects and internal stress at both the microscale (i.e. between grains due to anisotropic crystal properties) and macroscale (i.e. due to differential shrinkage during sintering) influence the fracture strength. The aim of this thesis is to study the nucleation and growth of defects in pure alumina and Cr-doped alumina, and to investigate how their behavior is affected by residual stresses, such those introduce by thermal expansion of the crystal grains.In this thesis, digital image correlation is applied to polycrystalline aluminas (i.e. Cr-doped alumina and pure alumina with average grain 3.6 µm and 1.5 µm respectively) that are stressed in an optical microscope. The defect size and the surface crack opening displacement were measured using digital image correlation. The distribution and population of crack nucleating defects were obtained by in-situ observation of the stressed surface and by analysis with digital image correlation. These data are then compared with independent measurements of the defect population using Hertzian indentation, from which defect populations are derived for the pure and Cr-doped alumina samples.Grain boundary plane and grain orientations in the vicinity of crack nuclei were characterised by electron microscopy. Crack nuclei were shown to develop at boundaries predicted to have high tensile thermal strains, caused by the orientation of the grain boundary plane relative to the adjacent grains, such as basal plane grain facets. The techniques of focused ion beam (FIB) milling and electron backscatter diffraction (EBSD) characterization of the crystallographic orientations and structure of cracked grain boundaries were used to provide data for a model to explain the cracking of these boundaries as a result of the thermal strains and the anisotropic thermal expansion behaviour of alumina. Advisors/Committee Members: Leach, Colin.

Subjects/Keywords: Alumina and Digital Image Correlation

Record Details Similar Records Cite « Share

❌

APA · Chicago · MLA · Vancouver · CSE | Export to Zotero / EndNote / Reference Manager

APA (6^th Edition):

Aswad, M. A. (2012). Residual Stress and Fracture in High Temperature Ceramics. (Doctoral Dissertation). University of Manchester. Retrieved from http://www.manchester.ac.uk/escholar/uk-ac-man-scw:157835

Chicago Manual of Style (16^th Edition):

Aswad, Mohsin Abbas. “Residual Stress and Fracture in High Temperature Ceramics.” 2012. Doctoral Dissertation, University of Manchester. Accessed February 27, 2021. http://www.manchester.ac.uk/escholar/uk-ac-man-scw:157835.

MLA Handbook (7^th Edition):

Aswad, Mohsin Abbas. “Residual Stress and Fracture in High Temperature Ceramics.” 2012. Web. 27 Feb 2021.

Vancouver:

Aswad MA. Residual Stress and Fracture in High Temperature Ceramics. [Internet] [Doctoral dissertation]. University of Manchester; 2012. [cited 2021 Feb 27]. Available from: http://www.manchester.ac.uk/escholar/uk-ac-man-scw:157835.

Council of Science Editors:

Aswad MA. Residual Stress and Fracture in High Temperature Ceramics. [Doctoral Dissertation]. University of Manchester; 2012. Available from: http://www.manchester.ac.uk/escholar/uk-ac-man-scw:157835

Stellenbosch University

6. Huchzermeyer, Richard Lynn. Measuring mechanical properties using digital image correlation: extracting tensile and fracture properties from a single sample.

Degree: MEng, 2017, Stellenbosch University

URL: http://hdl.handle.net/10019.1/102805

► ENGLISH ABSTRACT: Multiple material properties are required to perform structural integrity assessments and reliability estimates on in-service equipment. Conventional material characterization testing approaches do not… (more)

▼ ENGLISH ABSTRACT: Multiple material properties are required to perform structural integrity assessments and reliability estimates on in-service equipment. Conventional material characterization testing approaches do not cater towards the testing of inservice equipment, and therefore ‘near-non-destructive testing’ approaches, in particular the small punch test (SPT), are preferred. The SPT, while capable of determining multiple material properties from a single small sample, does have limitations both in terms the complexity in analysing the resulting data, and the accuracy of the measured properties. These limitations may be addressed through full-field surface displacement analysis techniques facilitated by digital image correlation (DIC). A combined approach to extracting multiple material properties from in-plane (two-dimensional, 2D) surface displacements, measured on a single sample through DIC, has been developed assuming an isotropic linear elastic material. This approach utilizes the virtual fields method (VFM) to obtain Young’s modulus (E) and Poisson’s ratio (v). These tensile stiffness properties (E and v) are in turn input to a non-linear least squares field fitting approach (FF), which is used to obtain the critical stress intensity factor (𝐾𝑓𝑓) associated with a crack or notch in a material. The VFM and FF are applied to two compressively loaded disk shaped sample geometries (containing central notches) as well as an elongated half compact tension sample geometry (W = 25 mm) manufactured from 6 mm thick polymethyl methacrylate (PMMA). The experimental methodology to obtain suitable two-dimensional surface displacement measurements though DIC is described. Furthermore, the implementation of the VFM and the FF is developed on a sample specific basis. Through a comparison to properties determined using standardized ASTM testing, a relative error for the VFM of -1.5 % to 4.6 % in E and 12.9 % to 40.2 % in v is obtained. A concomitant relative error in the FF is determined to be 33 % to 38 % for 𝐾𝑓𝑓. Experimental errors, in particular out of plane rotation, are identified and the limitations of the assumptions made in applying the techniques are examined. Furthermore, the manner in which the error in E and v obtained through the VFM contributes to the associated error in 𝐾𝑓𝑓 identified through the FF is examined. It is found that the FF approach is less sensitive to error in v provided that the error in E is small. The nominally successful combined application of the VFM and the FF to 2D displacement fields measured with DIC on a single sample (assuming a linear elastic isotropic material), strongly motivates for the further development of this approach. The approach could be extended to accommodate out-of-plane deformations measured through DIC and could be developed to extract properties from ductile metallic materials. It is envisioned that this will be addressed in future work, which could lead to the methodology being applied directly to the SPT. A significant first step towards this is… Advisors/Committee Members: Becker, Thorsten Hermann, Stellenbosch University. Faculty of Engineering. Dept. of Mechanical and Mechatronic Engineering..

Subjects/Keywords: Digital image correlation; Tensile architecture; Virtual fields method; Fracture properties; UCTD; Materials – Mechanical properties – Measurement

Record Details Similar Records Cite « Share

❌

APA · Chicago · MLA · Vancouver · CSE | Export to Zotero / EndNote / Reference Manager

APA (6^th Edition):

Huchzermeyer, R. L. (2017). Measuring mechanical properties using digital image correlation: extracting tensile and fracture properties from a single sample. (Thesis). Stellenbosch University. Retrieved from http://hdl.handle.net/10019.1/102805

Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation

Chicago Manual of Style (16^th Edition):

Huchzermeyer, Richard Lynn. “Measuring mechanical properties using digital image correlation: extracting tensile and fracture properties from a single sample.” 2017. Thesis, Stellenbosch University. Accessed February 27, 2021. http://hdl.handle.net/10019.1/102805.

Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation

MLA Handbook (7^th Edition):

Huchzermeyer, Richard Lynn. “Measuring mechanical properties using digital image correlation: extracting tensile and fracture properties from a single sample.” 2017. Web. 27 Feb 2021.

Vancouver:

Huchzermeyer RL. Measuring mechanical properties using digital image correlation: extracting tensile and fracture properties from a single sample. [Internet] [Thesis]. Stellenbosch University; 2017. [cited 2021 Feb 27]. Available from: http://hdl.handle.net/10019.1/102805.

Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation

Council of Science Editors:

Huchzermeyer RL. Measuring mechanical properties using digital image correlation: extracting tensile and fracture properties from a single sample. [Thesis]. Stellenbosch University; 2017. Available from: http://hdl.handle.net/10019.1/102805

Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation

Texas A&M University

7. Song, Ahran. Deformation Analysis of Sand Specimens using 3D Digital Image Correlation for the Calibration of an Elasto-Plastic Model.

Degree: PhD, Civil Engineering, 2012, Texas A&M University

URL: http://hdl.handle.net/1969.1/ETD-TAMU-2012-08-11674

► The use of Digital Image Correlation (DIC) technique has become increasingly popular for displacement measurements and for characterizing localized material deformation. In this study, a… (more)

Subjects/Keywords: Digital image correlation; Finite element method; Local deformation; Triaxial compression test; Sand specimen; Heterogeneous media

Record Details Similar Records Cite « Share

❌

APA · Chicago · MLA · Vancouver · CSE | Export to Zotero / EndNote / Reference Manager

APA (6^th Edition):

Song, A. (2012). Deformation Analysis of Sand Specimens using 3D Digital Image Correlation for the Calibration of an Elasto-Plastic Model. (Doctoral Dissertation). Texas A&M University. Retrieved from http://hdl.handle.net/1969.1/ETD-TAMU-2012-08-11674

Chicago Manual of Style (16^th Edition):

Song, Ahran. “Deformation Analysis of Sand Specimens using 3D Digital Image Correlation for the Calibration of an Elasto-Plastic Model.” 2012. Doctoral Dissertation, Texas A&M University. Accessed February 27, 2021. http://hdl.handle.net/1969.1/ETD-TAMU-2012-08-11674.

MLA Handbook (7^th Edition):

Song, Ahran. “Deformation Analysis of Sand Specimens using 3D Digital Image Correlation for the Calibration of an Elasto-Plastic Model.” 2012. Web. 27 Feb 2021.

Vancouver:

Song A. Deformation Analysis of Sand Specimens using 3D Digital Image Correlation for the Calibration of an Elasto-Plastic Model. [Internet] [Doctoral dissertation]. Texas A&M University; 2012. [cited 2021 Feb 27]. Available from: http://hdl.handle.net/1969.1/ETD-TAMU-2012-08-11674.

Council of Science Editors:

Song A. Deformation Analysis of Sand Specimens using 3D Digital Image Correlation for the Calibration of an Elasto-Plastic Model. [Doctoral Dissertation]. Texas A&M University; 2012. Available from: http://hdl.handle.net/1969.1/ETD-TAMU-2012-08-11674

Univerzitet u Beogradu

8. Mitrović, Nenad R. Naponi i deformacije struktura kompleksne geometrije cevovodne armature.

Degree: Mašinski fakultet, 2013, Univerzitet u Beogradu

URL: https://fedorabg.bg.ac.rs/fedora/get/o:6299/bdef:Content/get

►

Mašinstvo - Procesna tehnika / Mechanical engineering - Procesing technique

Dosadašnja istraživanja u oblasti opreme pod pritiskom, odnosno merenja i određivanja napona i deformacija struktura… (more)

▼

Mašinstvo - Procesna tehnika / Mechanical engineering - Procesing technique

Dosadašnja istraživanja u oblasti opreme pod pritiskom, odnosno merenja i određivanja napona i deformacija struktura kompleksne geometrije su se oslanjala na analitičke proračune najčešće bazirane na teoriji ljuski, numeričke proračune upotrebom računarskih softvera i konvencionalne eksperimentalne metode. Kao jedan od najčešćih zaključaka u svojim radovima, istraživači su naveli nepostojanje adekvatnih eksperimentalnih rezultata u postojećoj literaturi, odnosno iskazali potrebu za detaljnom eksperimentalnom analizom kritičnih mesta za koje nije moguće precizno odrediti veličine pomeranja, deformacija ili napona upotrebom analitičkih obrazaca ili numeričkih modela. Ograničenja korišćenih eksperimentalnih metoda su se ogledala u više aspekata. Prvo, za analizu geometrijskih diskontinuiteta, najčešće su korišćene standardizovane epruvete sa pripremljenim diskontinuitetima i ispitivane na zatezanje. Na osnovu dobijenih rezultata su pravljeni dijagrami sa faktorima koncentracije napona, koji su kasnije primenjivani na probleme geometrijski kompleksnih struktura. Ovakav pristup je davao samo okvirna rešenja, koja nisu bila dovoljno precizna i tačna. Drugo, eksperimenti su sprovođeni konvencionalnim metodama. Ograničenje konvencionalnih metoda je lokalno merenje, odnosno dobijanje vrednosti merenih veličina samo u jednoj tački. Treće, merenja su vršena samo u blizini geometrijskih diskontinuiteta, a ne na samim spojevima geometrijskih oblika, tako da nije bilo moguće merenje najvećih vrednosti deformacija. Jedan od ciljeva ove teze je upravo taj da prevaziđe navedene eksperimentalne probleme, odnosno da pokaže da je moguće primeniti relativno novu metodu digitalne korelacije slika na slučajeve ispitivanja struktura kompleksne geometrije u oblasti cevovodne armature. Metoda korelacije digitalnih slika, prevazilazi ograničenja metode mernih traka, kao najčešće korišćene konvencionalne metode i omogućava merenje Naponi i deformacije struktura kompleksne geometrije cevovodne armature iii celih polja pomeranja i deformacija. Jednim eksperimentalnim merenjem se dobija veliki broj podataka koja zamenjuje više desetina/stotina mernih traka i značajno smanjuje vreme pripreme eksperimenta, a samim tim i troškove. S druge strane, kako se metodom konačnih elemenata dobija kompletno polje pomeranja i deformacija, sama verifikacija numeričkog modelase mnogo jednostavnije sprovodi poređenjem sa rezultatima koji su predstavljeni na isti način. Eksperimentalno merenje celih polja deformacija omogućuje precizno određivanje mesta kritičnih, odnosno najvećih deformacija, kao i pravce glavnih deformacija koje omogućava bolju teorijsku analizu kompleksnih struktura.

Advisors/Committee Members: Petrović, Aleksandar, 1962-.

Subjects/Keywords: Geometrical discontinuity; sphere/cylinder junction; globe valve; digital image correlation method; 3D optical analysis; strain; displacement; finite element method; stress.

Record Details Similar Records Cite « Share

❌

APA · Chicago · MLA · Vancouver · CSE | Export to Zotero / EndNote / Reference Manager

APA (6^th Edition):

Mitrović, N. R. (2013). Naponi i deformacije struktura kompleksne geometrije cevovodne armature. (Thesis). Univerzitet u Beogradu. Retrieved from https://fedorabg.bg.ac.rs/fedora/get/o:6299/bdef:Content/get

Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation

Chicago Manual of Style (16^th Edition):

Mitrović, Nenad R. “Naponi i deformacije struktura kompleksne geometrije cevovodne armature.” 2013. Thesis, Univerzitet u Beogradu. Accessed February 27, 2021. https://fedorabg.bg.ac.rs/fedora/get/o:6299/bdef:Content/get.

Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation

MLA Handbook (7^th Edition):

Mitrović, Nenad R. “Naponi i deformacije struktura kompleksne geometrije cevovodne armature.” 2013. Web. 27 Feb 2021.

Vancouver:

Mitrović NR. Naponi i deformacije struktura kompleksne geometrije cevovodne armature. [Internet] [Thesis]. Univerzitet u Beogradu; 2013. [cited 2021 Feb 27]. Available from: https://fedorabg.bg.ac.rs/fedora/get/o:6299/bdef:Content/get.

Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation

Council of Science Editors:

Mitrović NR. Naponi i deformacije struktura kompleksne geometrije cevovodne armature. [Thesis]. Univerzitet u Beogradu; 2013. Available from: https://fedorabg.bg.ac.rs/fedora/get/o:6299/bdef:Content/get

Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation

NSYSU

9. Su, Fang-I. Effects of Thickness on the Thermal Expansion Coefficient of ITO/PET Film.

Degree: Master, Mechanical and Electro-Mechanical Engineering, 2011, NSYSU

URL: http://etd.lib.nsysu.edu.tw/ETD-db/ETD-search/view_etd?URN=etd-0815111-123009

► In this studing, application of the digital image correlation method (DIC) for determining the coefficient of thermal expansion (CTE) of Indium Tin Oxide/Polyethylene Terephthalate(ITO/PET) thin… (more)

Subjects/Keywords: Coefficient of Thermal Expansion; Indium Tin Oxide Film; Digital Image Correlation Method; Thickness; Polyethylene Terephthalate Substrat

Record Details Similar Records Cite « Share

❌

APA · Chicago · MLA · Vancouver · CSE | Export to Zotero / EndNote / Reference Manager

APA (6^th Edition):

Su, F. (2011). Effects of Thickness on the Thermal Expansion Coefficient of ITO/PET Film. (Thesis). NSYSU. Retrieved from http://etd.lib.nsysu.edu.tw/ETD-db/ETD-search/view_etd?URN=etd-0815111-123009

Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation

Chicago Manual of Style (16^th Edition):

Su, Fang-I. “Effects of Thickness on the Thermal Expansion Coefficient of ITO/PET Film.” 2011. Thesis, NSYSU. Accessed February 27, 2021. http://etd.lib.nsysu.edu.tw/ETD-db/ETD-search/view_etd?URN=etd-0815111-123009.

Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation

MLA Handbook (7^th Edition):

Su, Fang-I. “Effects of Thickness on the Thermal Expansion Coefficient of ITO/PET Film.” 2011. Web. 27 Feb 2021.

Vancouver:

Su F. Effects of Thickness on the Thermal Expansion Coefficient of ITO/PET Film. [Internet] [Thesis]. NSYSU; 2011. [cited 2021 Feb 27]. Available from: http://etd.lib.nsysu.edu.tw/ETD-db/ETD-search/view_etd?URN=etd-0815111-123009.

Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation

Council of Science Editors:

Su F. Effects of Thickness on the Thermal Expansion Coefficient of ITO/PET Film. [Thesis]. NSYSU; 2011. Available from: http://etd.lib.nsysu.edu.tw/ETD-db/ETD-search/view_etd?URN=etd-0815111-123009

Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation

10. Pereira, João. Assessing wood quality by spatial variability of transverse elastic properties within the stem: case study on P. pinaster at the meso scale.

Degree: 2013, RCAAP

URL: https://www.rcaap.pt/detail.jsp?id=oai:repositorio.ipv.pt:10400.19/2630

►

In this work the radial and longitudinal variations of maritime pine (Pinus pinaster Ait.) transverse elastic properties, within the stem, were investigated. Ring-oriented tensile tests… (more)

▼

In this work the radial and longitudinal variations of maritime pine (Pinus pinaster Ait.) transverse elastic properties, within the stem, were investigated. Ring-oriented tensile tests through five radial positions and three height levels were carried out in 750 radial-tangential specimens, at the growth ring scale (meso scale). The strain fields over the gauge section were measured by digital image correlation. A balance between accuracy and spatial resolution was found out in order to assess the gradient strain fields generated by the material heterogeneous mesostructure. A segmentation technique based on image processing and analysis was implemented in order to split each annual ring, at the region of interest, in three main tissues: resin ducts, earlywood (EW) and latewood (LW). Accordingly, transverse elastic moduli of each EW and LW layers were then estimated by two different identification methods: the Anisotropic based method (AbM) and the Virtual fields method (VFM). The VFM was applied to directly identify in-situ Q11 and Q66 stiffness components associated to EW and LW and the AbM was applied to the global ER and GRT evaluation. These effective mechanical properties were used to infer the local ones as a function of mean density, combining the application of a micromechanical model (mixture law) and a unit cell model. The Q11 and Q66 LW/EW ratios were found in the order of 1.32 and 2.45, respectively. These ratios suggest a linear relationship between elastic properties and density. Furthermore, the spatial variability of the elastic properties was analyzed and related to the mesostrucutre heterogeneity, which was given namely by means of density measurements that were taken by x-ray microdensitometry. The results were found in good agreement, presenting significant correlations with density. Specifically, both effective ER and GRT were most often up to approximately 90% determined by mean density.

Neste trabalho investigou-se a variação radial e longitudinal das propriedades elásticas nas direções perpendiculares ao fio de pinheiro bravo (Pinus pinaster Ait.) ao nível do tronco. Foram realizados ensaios de tração na direção radial utilizando provetes com faces orientadas no plano radial-tangencial e à escala do anel de crescimento (escala meso). Os campos de deformações ocorridos na região de interesse (ROI) foram medidos por correlação digital de imagem. Um equilíbrio entre a precisão e a resolução espacial foi encontrado para fora, a fim de avaliar os gradientes nos campos de deformações gerados pela mesoestrutura heterogénea do material. Uma técnica de segmentação baseada em processamento e análise de imagens foi implementado, no sentido de separar, em cada anel anual da ROI, as áreas correspondentes a três tecidos principais: dos canais de resina, do lenho inicial (LI) e do lenho tardio (LF). Por conseguinte, as constantes elásticas transversais de cada tipo de lenho, dentro do anel, foram então estimadas através da aplicação de duas metodologias de identificação distintas: o método baseado na…

Advisors/Committee Members: Xavier, José, Lousada, José, Silva, Abilio.

Subjects/Keywords: Maritime Pine; radial-tangential plane; meso scale; ring-oriented tensile test; digital image correlation; virtual fields method; mechanical properties; microdensitometry

Record Details Similar Records Cite « Share

❌

APA · Chicago · MLA · Vancouver · CSE | Export to Zotero / EndNote / Reference Manager

APA (6^th Edition):

Pereira, J. (2013). Assessing wood quality by spatial variability of transverse elastic properties within the stem: case study on P. pinaster at the meso scale. (Thesis). RCAAP. Retrieved from https://www.rcaap.pt/detail.jsp?id=oai:repositorio.ipv.pt:10400.19/2630

Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation

Chicago Manual of Style (16^th Edition):

Pereira, João. “Assessing wood quality by spatial variability of transverse elastic properties within the stem: case study on P. pinaster at the meso scale.” 2013. Thesis, RCAAP. Accessed February 27, 2021. https://www.rcaap.pt/detail.jsp?id=oai:repositorio.ipv.pt:10400.19/2630.

Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation

MLA Handbook (7^th Edition):

Pereira, João. “Assessing wood quality by spatial variability of transverse elastic properties within the stem: case study on P. pinaster at the meso scale.” 2013. Web. 27 Feb 2021.

Vancouver:

Pereira J. Assessing wood quality by spatial variability of transverse elastic properties within the stem: case study on P. pinaster at the meso scale. [Internet] [Thesis]. RCAAP; 2013. [cited 2021 Feb 27]. Available from: https://www.rcaap.pt/detail.jsp?id=oai:repositorio.ipv.pt:10400.19/2630.

Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation

Council of Science Editors:

Pereira J. Assessing wood quality by spatial variability of transverse elastic properties within the stem: case study on P. pinaster at the meso scale. [Thesis]. RCAAP; 2013. Available from: https://www.rcaap.pt/detail.jsp?id=oai:repositorio.ipv.pt:10400.19/2630

Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation

Brno University of Technology

11. Kováříková, Sabina. Využití DIC při měření zbytkových napětí metodou vrtání otvoru: Application of DIC method in residual stress measurement using hole drilling method.

Degree: 2020, Brno University of Technology

URL: http://hdl.handle.net/11012/193602

► This thesis deals with measurement of residual stress by hole drilling method. This method is based on drilling a hole and measurement of deformation in… (more)

Subjects/Keywords: Zbytková napětí; odvrtávací metoda; digitální korelace obrazu; DIC; Residual stress; Hole-Drilling method; Digital Image Correlation; DIC

Record Details Similar Records Cite « Share

❌

APA · Chicago · MLA · Vancouver · CSE | Export to Zotero / EndNote / Reference Manager

APA (6^th Edition):

Kováříková, S. (2020). Využití DIC při měření zbytkových napětí metodou vrtání otvoru: Application of DIC method in residual stress measurement using hole drilling method. (Thesis). Brno University of Technology. Retrieved from http://hdl.handle.net/11012/193602

Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation

Chicago Manual of Style (16^th Edition):

Kováříková, Sabina. “Využití DIC při měření zbytkových napětí metodou vrtání otvoru: Application of DIC method in residual stress measurement using hole drilling method.” 2020. Thesis, Brno University of Technology. Accessed February 27, 2021. http://hdl.handle.net/11012/193602.

Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation

MLA Handbook (7^th Edition):

Kováříková, Sabina. “Využití DIC při měření zbytkových napětí metodou vrtání otvoru: Application of DIC method in residual stress measurement using hole drilling method.” 2020. Web. 27 Feb 2021.

Vancouver:

Kováříková S. Využití DIC při měření zbytkových napětí metodou vrtání otvoru: Application of DIC method in residual stress measurement using hole drilling method. [Internet] [Thesis]. Brno University of Technology; 2020. [cited 2021 Feb 27]. Available from: http://hdl.handle.net/11012/193602.

Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation

Council of Science Editors:

Kováříková S. Využití DIC při měření zbytkových napětí metodou vrtání otvoru: Application of DIC method in residual stress measurement using hole drilling method. [Thesis]. Brno University of Technology; 2020. Available from: http://hdl.handle.net/11012/193602

Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation

Loughborough University

12. Panchal, Dhaval. Failure and damage progression of 3D woven composite structures subjected to out-of-plane loading.

Degree: PhD, 2017, Loughborough University

URL: http://hdl.handle.net/2134/33284

► Three-dimensionally woven composites are a relatively new class of material that offer improved out-of-plane performance by including through-the-thickness mechanical reinforcement compared to traditional laminated composite… (more)

▼ Three-dimensionally woven composites are a relatively new class of material that offer improved out-of-plane performance by including through-the-thickness mechanical reinforcement compared to traditional laminated composite structures. The mechanical properties are highly dependent upon the weave architecture as this dictates the nature of the through the thickness reinforcement and its effect in improving out-of-plane shear strength. A comparison of two testing methods, Short Beam Strength, and Five Point Bending was conducted over a range of span to thickness ratios with the latter found to be more consistent at producing shear failure over a greater range of span to thickness ratios, although evidence of matrix crushing was present in both, and flexural failure in the Short Beam Strength test. Two weave architectures, the orthogonal and angle weave were subjected to the Five Point Bending test and the failure and damage progression behaviour of both weave architectures were characterised using Digital Image Correlation analysis to measure the edge strain through the thickness of the specimens. This testing showed the angle weave architecture had in general a higher failure strength, and more gradual failure due to longer debonding cracks. The orthogonal weave architecture showed a characteristic post-failure response indicative of crack bridging with discrete load recovery and load drop phases. A numerical model developed from previous work builds on the mosaic modelling method and was modified to include cohesive elements in order to simulate interface debonding via the maximum stress criterion. The simulations are consistently 15 20% greater in failure loads, and 8 - 12% greater in failure shear stresses than those found from the averaged experimental results over the range of tested span to thickness ratios. Post failure response was not modelled. The work presented in this thesis is another step towards gaining a thorough understanding of the mechanical properties of 3D woven composite structures, focussing in particular on out of plane shear strength. The modified mosaic modelling method used showed it is effective at modelling the out of plane testing of orthogonal 3D woven composite structures, and offer the potential to predict the failure of larger composite structures of the same construction and 3D woven architecture although developments are still needed in modelling the post failure response.

Subjects/Keywords: 620.1; 3D woven composites; Out-of-plane; Five-point bending; Orthogonal weave; Angle weave; Digital Image Correlation; Mosaic modelling method

Record Details Similar Records Cite « Share

❌

APA · Chicago · MLA · Vancouver · CSE | Export to Zotero / EndNote / Reference Manager

APA (6^th Edition):

Panchal, D. (2017). Failure and damage progression of 3D woven composite structures subjected to out-of-plane loading. (Doctoral Dissertation). Loughborough University. Retrieved from http://hdl.handle.net/2134/33284

Chicago Manual of Style (16^th Edition):

Panchal, Dhaval. “Failure and damage progression of 3D woven composite structures subjected to out-of-plane loading.” 2017. Doctoral Dissertation, Loughborough University. Accessed February 27, 2021. http://hdl.handle.net/2134/33284.

MLA Handbook (7^th Edition):

Panchal, Dhaval. “Failure and damage progression of 3D woven composite structures subjected to out-of-plane loading.” 2017. Web. 27 Feb 2021.

Vancouver:

Panchal D. Failure and damage progression of 3D woven composite structures subjected to out-of-plane loading. [Internet] [Doctoral dissertation]. Loughborough University; 2017. [cited 2021 Feb 27]. Available from: http://hdl.handle.net/2134/33284.

Council of Science Editors:

Panchal D. Failure and damage progression of 3D woven composite structures subjected to out-of-plane loading. [Doctoral Dissertation]. Loughborough University; 2017. Available from: http://hdl.handle.net/2134/33284

13. Echchorfi, Rachid. Dialogue essais - simulation et identification de lois de comportement d’alliage à mémoire de forme en chargement multiaxial : Coupled experimental-numerical study and identification of multiaxial SMA constitutive behavior.

Degree: Docteur es, Mécanique et matériaux, 2013, Paris, ENSAM

URL: http://www.theses.fr/2013ENAM0035

►

Les travaux présentés ont consisté à développer des stratégies d'identification performantes des paramètres des lois de comportement superélastique des Alliages à Mémoire de Forme (AMF).… (more)

▼

Les travaux présentés ont consisté à développer des stratégies d'identification performantes des paramètres des lois de comportement superélastique des Alliages à Mémoire de Forme (AMF). L'objectif est de disposer d'une solution complète de caractérisation, d'identification, et de simulation de structures en AMF soumises à des sollicitations complexes. Une base de données expérimentale unifiée pour un alliage de NiTi superélastique a été établie pour une multitude de trajets de déformation multiaxiaux et à différentes températures : en traction homogène, en compression, en traction-compression et en traction-traction. Une caractérisation expérimentale a été développée sur une plate-forme multiaxiale assemblée au laboratoire durant ce travail. L'emploi de la corrélation d'images a permis d'enrichir la base de données expérimentale en déterminant pour chaque essai les champs cinématiques. Cette collection d'essais a permis de montrer l'importante différence de comportement observée entre les directions de laminage et transverse, bien que le matériau soit faiblement texturé. Des procédures d'identification du comportement thermomécanique des AMF ont été mises en place, basées sur la construction et minimisation d'une fonction objectif régularisée. La première est basée sur l'exploitation des courbes contrainte-déformation moyennes sous chargement homogène et unixial. La seconde exploite la richesse des champs de déformations mesurés en essai hétérogène. Les deux stratégies ont permis d'identifier les huit paramètres gouvernant le comportement superélastique du modèle de Chemisky et al. (Chemisky et al. 2011). Des différences entre les jeux de paramètres identifiés sont caractéristiques des effets d'anisotropie observés. Le succès de cette stratégie démontre sa pertinence et est encourageant pour l'identification de paramètres de lois de comportement anisotropes.

In this work, efficient identification strategies were developed to determine the characteristic parameters of the thermomechanical behavior of pseudoelastic Shape Memory Alloys (SMA). The aim is to obtain a complete solution for characterization, identification and numerical simulation of SMA structures undergoing multiaxial loading paths. A unified experimental database has been constructed to characterize the behavior of superelastic NiTi SMAs. This database includes tension, compression, tension-tension and tension-compression multiaxial tests at different temperatures. A characterization methodology has been developed on a multiaxial testing setup, which has been assembled in the laboratory during this Ph.D. project. Vital information about the strain fields for each test is added to the experimental database through the use of Digital Image Correlation. A significant difference in the thermomechanical behavior between the rolling and transverse directions has been observed, even when the specimens are not strongly textured. Two strategies were developed that rely on the minimization of a regularized cost function for identification of thermomechanical…

Advisors/Committee Members: Meraghni, Fodil (thesis director).

Subjects/Keywords: AMF - NiTi; Superélasticité; Méthode d’identification inverse; Essais multiaxiaux; Corrélation d’images; SMA - NiTi; Superelasticity; Inverse Identification Method; Multiaxial testing; Digital Image Correlation

Record Details Similar Records Cite « Share

❌

APA · Chicago · MLA · Vancouver · CSE | Export to Zotero / EndNote / Reference Manager

APA (6^th Edition):

Echchorfi, R. (2013). Dialogue essais - simulation et identification de lois de comportement d’alliage à mémoire de forme en chargement multiaxial : Coupled experimental-numerical study and identification of multiaxial SMA constitutive behavior. (Doctoral Dissertation). Paris, ENSAM. Retrieved from http://www.theses.fr/2013ENAM0035

Chicago Manual of Style (16^th Edition):

Echchorfi, Rachid. “Dialogue essais - simulation et identification de lois de comportement d’alliage à mémoire de forme en chargement multiaxial : Coupled experimental-numerical study and identification of multiaxial SMA constitutive behavior.” 2013. Doctoral Dissertation, Paris, ENSAM. Accessed February 27, 2021. http://www.theses.fr/2013ENAM0035.

MLA Handbook (7^th Edition):

Echchorfi, Rachid. “Dialogue essais - simulation et identification de lois de comportement d’alliage à mémoire de forme en chargement multiaxial : Coupled experimental-numerical study and identification of multiaxial SMA constitutive behavior.” 2013. Web. 27 Feb 2021.

Vancouver:

Echchorfi R. Dialogue essais - simulation et identification de lois de comportement d’alliage à mémoire de forme en chargement multiaxial : Coupled experimental-numerical study and identification of multiaxial SMA constitutive behavior. [Internet] [Doctoral dissertation]. Paris, ENSAM; 2013. [cited 2021 Feb 27]. Available from: http://www.theses.fr/2013ENAM0035.

Council of Science Editors:

Echchorfi R. Dialogue essais - simulation et identification de lois de comportement d’alliage à mémoire de forme en chargement multiaxial : Coupled experimental-numerical study and identification of multiaxial SMA constitutive behavior. [Doctoral Dissertation]. Paris, ENSAM; 2013. Available from: http://www.theses.fr/2013ENAM0035

Virginia Tech

14. Aidi, Bilel. Experimental and Numerical Analysis of Damage in Notched Composites.

Degree: PhD, Engineering Mechanics, 2016, Virginia Tech

URL: http://hdl.handle.net/10919/82559

► This dissertation contains the results from an experimental study, numerical, and analytical study conducted on quasi-isotropic carbon fiber laminates containing a center hole (notch) subjected… (more)

▼ This dissertation contains the results from an experimental study, numerical, and analytical study conducted on quasi-isotropic carbon fiber laminates containing a center hole (notch) subjected to constant amplitude tension-tension fatigue loading in order to investigate the effect of fatigue damage development on the residual properties. Quasi-static tests were initially performed on notched composites using digital image correlation (DIC) to determine the strain profiles at selected transverse sections of the outer ply of the laminates and the static strength of the laminates. Subsequently, tension-tension fatigue tests were carried out at 70%, 75% and 80% of the nominal static failure load. A finite element model was developed using Abaqus and Digimat in which Digimat was used to implement the damage evolution model via a user-defined material subroutine. Damage initiation has been assessed using Hashin's failure criteria and the Matzenmiller model was adopted for damage evolution. A second finite element model was developed using Abaqus and Autodesk Simulation Composite Analysis (ASCA) in which ASCA was used to implement the user-material subroutine. The subroutine includes a failure initiation criterion based upon multi-continuum theory (MCT) and an energy-based damage evolution law. Numerical and experimental strain results were presented and compared for different section lines on the outer surface of the laminate at different loading stages. Additionally, the experimentally measured notched composite strength was compared with the predictions from the finite element solutions. These results are used as baseline for subsequent comparison with strain profiles obtained using DIC for specimens fatigued at different stress levels and fatigue lifetime fractions. The results showed a significant effect of fatigue damage development on strain redistribution even at early stages of fatigue. The results also showed the capability of DIC technique to identify damage initiation and its location. Furthermore, X-ray computed tomography (CT) was used to examine the sequence of damage development throughout the fatigue lifetime and to connect the observed damage mechanisms with the occurred change of strain profiles. Experimental vibrational modal analysis tests were also conducted to assess the effect of fatigue damage on the residual frequency responses (RFRs). Vibrational measurements were initially performed on pristine notched composites. The results are used as baseline for subsequent comparison with strain profiles obtained with DIC. Finite element models based on the classical plate theory (Kirchhoff) and the shear deformable theory (Mindlin) within the framework of equivalent single-layer and layer-wise concepts as well as the three-dimensional theory of elasticity are developed to predict the natural frequencies of non-fatigued specimen. These models are implemented using the finite element software, Abaqus, to determine the natural frequencies and the corresponding mode shapes. In addition, an analytical model… Advisors/Committee Members: Case, Scott W. (committeechair), Ragab, Saad A. (committee member), Lattimer, Brian Y. (committee member), Cramer, Mark S. (committee member), De Vita, Raffaella (committee member).

Subjects/Keywords: Carbon fiber; notched composite; fatigue; residual properties; digital image correlation (DIC); damage monitoring; vibration; Finite Element Method

Record Details Similar Records Cite « Share

❌

APA · Chicago · MLA · Vancouver · CSE | Export to Zotero / EndNote / Reference Manager

APA (6^th Edition):

Aidi, B. (2016). Experimental and Numerical Analysis of Damage in Notched Composites. (Doctoral Dissertation). Virginia Tech. Retrieved from http://hdl.handle.net/10919/82559

Chicago Manual of Style (16^th Edition):

Aidi, Bilel. “Experimental and Numerical Analysis of Damage in Notched Composites.” 2016. Doctoral Dissertation, Virginia Tech. Accessed February 27, 2021. http://hdl.handle.net/10919/82559.

MLA Handbook (7^th Edition):

Aidi, Bilel. “Experimental and Numerical Analysis of Damage in Notched Composites.” 2016. Web. 27 Feb 2021.

Vancouver:

Aidi B. Experimental and Numerical Analysis of Damage in Notched Composites. [Internet] [Doctoral dissertation]. Virginia Tech; 2016. [cited 2021 Feb 27]. Available from: http://hdl.handle.net/10919/82559.

Council of Science Editors:

Aidi B. Experimental and Numerical Analysis of Damage in Notched Composites. [Doctoral Dissertation]. Virginia Tech; 2016. Available from: http://hdl.handle.net/10919/82559

15. Brown, Kenneth Alexander. Understanding and Exploiting Wind Tunnels with Porous Flexible Walls for Aerodynamic Measurement.

Degree: PhD, Mechanical Engineering, 2016, Virginia Tech

URL: http://hdl.handle.net/10919/73363

► The aerodynamic behavior of wind tunnels with porous, flexible walls formed from tensioned Kevlar has been characterized and new measurement techniques in such wind tunnels… (more)

▼ The aerodynamic behavior of wind tunnels with porous, flexible walls formed from tensioned Kevlar has been characterized and new measurement techniques in such wind tunnels explored. The objective is to bring the aerodynamic capabilities of so-called Kevlar-wall test sections in-line with those of traditional solid-wall test sections. The primary facility used for this purpose is the 1.85-m by 1.85-m Stability Wind Tunnel at Virginia Tech, and supporting data is provided by the 2-m by 2-m Low Speed Wind Tunnel at the Japanese Aerospace Exploration Agency, both of which employ Kevlar-wall test sections that can be replaced by solid-wall test sections. The behavior of Kevlar fabric, both aerodynamically and mechanically, is first investigated to provide a foundation for calculations involving wall interference correction and determination of the boundary conditions at the Kevlar wall. Building upon previous advancements in wall interference corrections for Kevlar-wall test sections, panel method codes are then employed to simulate the wind tunnel flow in the presence of porous, flexible Kevlar walls. An existing two-dimensional panel method is refined by examining the dependency of correction performance on key test section modeling assumptions, and a novel three-dimensional method is presented. Validation of the interference corrections, and thus validation of the Kevlar-wall aerodynamic performance, is accomplished by comparing aerodynamic coefficients between back-to-back tests of models carried out in the solid- and Kevlar-wall test sections. Analysis of the test results identified the existence of three new mechanisms by which Kevlar walls cause wall-interference. Additionally, novel measurements of the boundary conditions are made during the Kevlar-wall tests to characterize the flow at the boundary. Specifically, digital image correlation is used to measure the global deformation of the Kevlar walls under wind loading. Such data, when used in conjunction with knowledge of the pre-tension in the Kevlar wall and the material properties of the Kevlar, yields the pressure loading experienced by the wall. The pressure loading problem constitutes an inverse problem, and significant effort is made towards overcoming the ill-posedness of the problem to yield accurate wall pressure distributions, as well as lift measurements from the walls. Taken as a whole, this document offers a comprehensive view of the aerodynamic performance of Kevlar-wall test sections. Advisors/Committee Members: Devenport, William J. (committeechair), Borgoltz, Aurelien (committee member), Lowe, Kevin T. (committee member), Burdisso, Ricardo A. (committee member), Patil, Mayuresh J. (committee member), Kapania, Rakesh K. (committee member).

Subjects/Keywords: wind tunnel; aerodynamics; aeroacoustics; Kevlar-wall; wall interference; panel method; porosity; inverse problem; digital image correlation; membrane mechanics

11 more images…

Record Details Similar Records Cite « Share

❌

APA · Chicago · MLA · Vancouver · CSE | Export to Zotero / EndNote / Reference Manager

APA (6^th Edition):

Brown, K. A. (2016). Understanding and Exploiting Wind Tunnels with Porous Flexible Walls for Aerodynamic Measurement. (Doctoral Dissertation). Virginia Tech. Retrieved from http://hdl.handle.net/10919/73363

Chicago Manual of Style (16^th Edition):

Brown, Kenneth Alexander. “Understanding and Exploiting Wind Tunnels with Porous Flexible Walls for Aerodynamic Measurement.” 2016. Doctoral Dissertation, Virginia Tech. Accessed February 27, 2021. http://hdl.handle.net/10919/73363.

MLA Handbook (7^th Edition):

Brown, Kenneth Alexander. “Understanding and Exploiting Wind Tunnels with Porous Flexible Walls for Aerodynamic Measurement.” 2016. Web. 27 Feb 2021.

Vancouver:

Brown KA. Understanding and Exploiting Wind Tunnels with Porous Flexible Walls for Aerodynamic Measurement. [Internet] [Doctoral dissertation]. Virginia Tech; 2016. [cited 2021 Feb 27]. Available from: http://hdl.handle.net/10919/73363.

Council of Science Editors:

Brown KA. Understanding and Exploiting Wind Tunnels with Porous Flexible Walls for Aerodynamic Measurement. [Doctoral Dissertation]. Virginia Tech; 2016. Available from: http://hdl.handle.net/10919/73363

University of Alberta

16. Melenka, Garrett W. Three Dimensional Deformation of Orthodontic Brackets.

Degree: MS, Department of Mechanical Engineering, 2012, University of Alberta

URL: https://era.library.ualberta.ca/files/v118rf025

► Braces are commonly used to correct misalignments or malocclusions in the mouth. One particular orthodontic treatment utilizes archwire rotation to control the anterior inclination of… (more)

Subjects/Keywords: Digital Image Correlation; Deformation; Orthodontic Brackets

Record Details Similar Records Cite « Share

❌

APA · Chicago · MLA · Vancouver · CSE | Export to Zotero / EndNote / Reference Manager

APA (6^th Edition):

Melenka, G. W. (2012). Three Dimensional Deformation of Orthodontic Brackets. (Masters Thesis). University of Alberta. Retrieved from https://era.library.ualberta.ca/files/v118rf025

Chicago Manual of Style (16^th Edition):

Melenka, Garrett W. “Three Dimensional Deformation of Orthodontic Brackets.” 2012. Masters Thesis, University of Alberta. Accessed February 27, 2021. https://era.library.ualberta.ca/files/v118rf025.

MLA Handbook (7^th Edition):

Melenka, Garrett W. “Three Dimensional Deformation of Orthodontic Brackets.” 2012. Web. 27 Feb 2021.

Vancouver:

Melenka GW. Three Dimensional Deformation of Orthodontic Brackets. [Internet] [Masters thesis]. University of Alberta; 2012. [cited 2021 Feb 27]. Available from: https://era.library.ualberta.ca/files/v118rf025.

Council of Science Editors:

Melenka GW. Three Dimensional Deformation of Orthodontic Brackets. [Masters Thesis]. University of Alberta; 2012. Available from: https://era.library.ualberta.ca/files/v118rf025

University of Alberta

17. Nazeri, Hamed. An investigation of the strain field and inter-fragmentary movement of a broken hemi-pelvis.

Degree: MS, Department of Mechanical Engineering, 2015, University of Alberta

URL: https://era.library.ualberta.ca/files/jm214r72m

► Pelvic fracture is considered a common and sometimes fatal injury. There are still developments in novel pelvic fixations. In order to investigate the performance of… (more)

Subjects/Keywords: Digital Image Correlation; Crack Evaluation; Pelvis; Strain

Record Details Similar Records Cite « Share

❌

APA · Chicago · MLA · Vancouver · CSE | Export to Zotero / EndNote / Reference Manager

APA (6^th Edition):

Nazeri, H. (2015). An investigation of the strain field and inter-fragmentary movement of a broken hemi-pelvis. (Masters Thesis). University of Alberta. Retrieved from https://era.library.ualberta.ca/files/jm214r72m

Chicago Manual of Style (16^th Edition):

Nazeri, Hamed. “An investigation of the strain field and inter-fragmentary movement of a broken hemi-pelvis.” 2015. Masters Thesis, University of Alberta. Accessed February 27, 2021. https://era.library.ualberta.ca/files/jm214r72m.

MLA Handbook (7^th Edition):

Nazeri, Hamed. “An investigation of the strain field and inter-fragmentary movement of a broken hemi-pelvis.” 2015. Web. 27 Feb 2021.

Vancouver:

Nazeri H. An investigation of the strain field and inter-fragmentary movement of a broken hemi-pelvis. [Internet] [Masters thesis]. University of Alberta; 2015. [cited 2021 Feb 27]. Available from: https://era.library.ualberta.ca/files/jm214r72m.

Council of Science Editors:

Nazeri H. An investigation of the strain field and inter-fragmentary movement of a broken hemi-pelvis. [Masters Thesis]. University of Alberta; 2015. Available from: https://era.library.ualberta.ca/files/jm214r72m

Penn State University

18. Vidvans, Amey Narayan. A modified structure from motion framework based on smartphone imaging for 3D reconstruction of arbitrary shapes.

Degree: 2017, Penn State University

URL: https://submit-etda.libraries.psu.edu/catalog/13939afv5067

► There is a need for scalable open source 3D reconstruction systems for reverse engineering and in other applications involving additive manufacturing. This is because most… (more)

Subjects/Keywords: Reconstruction; Smartphone; Digital Image Correlation; Reverse Engineering

Record Details Similar Records Cite « Share

❌

APA · Chicago · MLA · Vancouver · CSE | Export to Zotero / EndNote / Reference Manager

APA (6^th Edition):

Vidvans, A. N. (2017). A modified structure from motion framework based on smartphone imaging for 3D reconstruction of arbitrary shapes. (Thesis). Penn State University. Retrieved from https://submit-etda.libraries.psu.edu/catalog/13939afv5067

Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation

Chicago Manual of Style (16^th Edition):

Vidvans, Amey Narayan. “A modified structure from motion framework based on smartphone imaging for 3D reconstruction of arbitrary shapes.” 2017. Thesis, Penn State University. Accessed February 27, 2021. https://submit-etda.libraries.psu.edu/catalog/13939afv5067.

Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation

MLA Handbook (7^th Edition):

Vidvans, Amey Narayan. “A modified structure from motion framework based on smartphone imaging for 3D reconstruction of arbitrary shapes.” 2017. Web. 27 Feb 2021.

Vancouver:

Vidvans AN. A modified structure from motion framework based on smartphone imaging for 3D reconstruction of arbitrary shapes. [Internet] [Thesis]. Penn State University; 2017. [cited 2021 Feb 27]. Available from: https://submit-etda.libraries.psu.edu/catalog/13939afv5067.

Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation

Council of Science Editors:

Vidvans AN. A modified structure from motion framework based on smartphone imaging for 3D reconstruction of arbitrary shapes. [Thesis]. Penn State University; 2017. Available from: https://submit-etda.libraries.psu.edu/catalog/13939afv5067

Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation

University of Manchester

19. Aswad, Mohsin Abbas. Residual stress and fracture in high temperature ceramics.

Degree: PhD, 2012, University of Manchester

URL: https://www.research.manchester.ac.uk/portal/en/theses/residual-stress-and-fracture-in-high-temperature-ceramics(2d617cd5-ac5c-4927-8b87-cae0fdcee6da).html ; http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.553453

► Recrystallised alumina is used as a high performance crucible material. Its thermal shock resistance is known to be affected by component shape, and also by… (more)

▼ Recrystallised alumina is used as a high performance crucible material. Its thermal shock resistance is known to be affected by component shape, and also by processing variables, since the defects and internal stress at both the microscale (i.e. between grains due to anisotropic crystal properties) and macroscale (i.e. due to differential shrinkage during sintering) influence the fracture strength. The aim of this thesis is to study the nucleation and growth of defects in pure alumina and Cr-doped alumina, and to investigate how their behavior is affected by residual stresses, such those introduce by thermal expansion of the crystal grains. In this thesis, digital image correlation is applied to polycrystalline aluminas (i.e. Cr-doped alumina and pure alumina with average grain 3.6 µm and 1.5 µm respectively) that are stressed in an optical microscope. The defect size and the surface crack opening displacement were measured using digital image correlation. The distribution and population of crack nucleating defects were obtained by in-situ observation of the stressed surface and by analysis with digital image correlation. These data are then compared with independent measurements of the defect population using Hertzian indentation, from which defect populations are derived for the pure and Cr-doped alumina samples. Grain boundary plane and grain orientations in the vicinity of crack nuclei were characterised by electron microscopy. Crack nuclei were shown to develop at boundaries predicted to have high tensile thermal strains, caused by the orientation of the grain boundary plane relative to the adjacent grains, such as basal plane grain facets. The techniques of focused ion beam (FIB) milling and electron backscatter diffraction (EBSD) characterization of the crystallographic orientations and structure of cracked grain boundaries were used to provide data for a model to explain the cracking of these boundaries as a result of the thermal strains and the anisotropic thermal expansion behaviour of alumina.

Subjects/Keywords: 620.14; Alumina and Digital Image Correlation

Record Details Similar Records Cite « Share

❌

APA · Chicago · MLA · Vancouver · CSE | Export to Zotero / EndNote / Reference Manager

APA (6^th Edition):

Aswad, M. A. (2012). Residual stress and fracture in high temperature ceramics. (Doctoral Dissertation). University of Manchester. Retrieved from https://www.research.manchester.ac.uk/portal/en/theses/residual-stress-and-fracture-in-high-temperature-ceramics(2d617cd5-ac5c-4927-8b87-cae0fdcee6da).html ; http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.553453

Chicago Manual of Style (16^th Edition):

Aswad, Mohsin Abbas. “Residual stress and fracture in high temperature ceramics.” 2012. Doctoral Dissertation, University of Manchester. Accessed February 27, 2021. https://www.research.manchester.ac.uk/portal/en/theses/residual-stress-and-fracture-in-high-temperature-ceramics(2d617cd5-ac5c-4927-8b87-cae0fdcee6da).html ; http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.553453.

MLA Handbook (7^th Edition):

Aswad, Mohsin Abbas. “Residual stress and fracture in high temperature ceramics.” 2012. Web. 27 Feb 2021.

Vancouver:

Aswad MA. Residual stress and fracture in high temperature ceramics. [Internet] [Doctoral dissertation]. University of Manchester; 2012. [cited 2021 Feb 27]. Available from: https://www.research.manchester.ac.uk/portal/en/theses/residual-stress-and-fracture-in-high-temperature-ceramics(2d617cd5-ac5c-4927-8b87-cae0fdcee6da).html ; http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.553453.

Council of Science Editors:

Aswad MA. Residual stress and fracture in high temperature ceramics. [Doctoral Dissertation]. University of Manchester; 2012. Available from: https://www.research.manchester.ac.uk/portal/en/theses/residual-stress-and-fracture-in-high-temperature-ceramics(2d617cd5-ac5c-4927-8b87-cae0fdcee6da).html ; http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.553453

University of Manchester

20. Sandala, Rebecca Sarah. Deformation mechanims of two-phase titanium alloys.

Degree: PhD, 2014, University of Manchester

URL: https://www.research.manchester.ac.uk/portal/en/theses/deformation-mechanims-of-twophase-ttitanium-alloys(50a395c3-70f6-49f7-a3df-41d2f899a851).html ; http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.607111

► Two-phase Ti6246 alloy is a light weight material exhibiting very high strength at higher temperatures compared to the commonly used Ti64 alloy. This particular alloy… (more)

▼ Two-phase Ti6246 alloy is a light weight material exhibiting very high strength at higher temperatures compared to the commonly used Ti64 alloy. This particular alloy is used at the later stages of compressor discs within the aero engines. However, compressor discs undergo a number of cyclic stresses, which could eventually lead to fatigue failure. In order to optimize the microstructure for design and lifing models, an improved understanding of the localised deformation mechanisms is crucial, particularly at the surface, as cracks can be initiated leading to failure and in turn affect the life expectancy of the component. Two-phase alloys in use have very complex lamellar microstructures comprising of a mixture of coarse and fine phases and their role in deformation can be very complex and difficult to understand. The focus of this study was particularly based on the importance of the beta phase in strengthening two-phase microstructures. Therefore, this study has been simplified to compare model lamellar microstructures, which have particular sizes of beta phase in between alpha lamellae. Digital Image Correlation along with high resolution imaging was used to develop a detailed understanding of the localised deformation in these microstructures. Widening the beta phase in-between alpha lamellae caused a more homogenous deformation, while ageing the beta phase with fine secondary alpha strengthened the microstructure. However, all microstructures showed that the single continuous alpha layer at beta grain boundaries depicted the highest amount of deformation, which can be detrimental for the life of the component. The behaviour of slip at the α/β interface not only depended on the size of the phases but also depended on the neighbouring crystallographic orientations and the relationship of the two phases, specifically the alignment of the close packed slip directions. Strain maps of these microstructures were subsequently related to corresponding Schmid factor maps and crystal plasticity models to improve this understanding.

Subjects/Keywords: 669; Deformation; Titanium; Ti6246; Digital Image Correlation

Record Details Similar Records Cite « Share

❌

APA · Chicago · MLA · Vancouver · CSE | Export to Zotero / EndNote / Reference Manager

APA (6^th Edition):

Sandala, R. S. (2014). Deformation mechanims of two-phase titanium alloys. (Doctoral Dissertation). University of Manchester. Retrieved from https://www.research.manchester.ac.uk/portal/en/theses/deformation-mechanims-of-twophase-ttitanium-alloys(50a395c3-70f6-49f7-a3df-41d2f899a851).html ; http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.607111

Chicago Manual of Style (16^th Edition):

Sandala, Rebecca Sarah. “Deformation mechanims of two-phase titanium alloys.” 2014. Doctoral Dissertation, University of Manchester. Accessed February 27, 2021. https://www.research.manchester.ac.uk/portal/en/theses/deformation-mechanims-of-twophase-ttitanium-alloys(50a395c3-70f6-49f7-a3df-41d2f899a851).html ; http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.607111.

MLA Handbook (7^th Edition):

Sandala, Rebecca Sarah. “Deformation mechanims of two-phase titanium alloys.” 2014. Web. 27 Feb 2021.

Vancouver:

Sandala RS. Deformation mechanims of two-phase titanium alloys. [Internet] [Doctoral dissertation]. University of Manchester; 2014. [cited 2021 Feb 27]. Available from: https://www.research.manchester.ac.uk/portal/en/theses/deformation-mechanims-of-twophase-ttitanium-alloys(50a395c3-70f6-49f7-a3df-41d2f899a851).html ; http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.607111.

Council of Science Editors:

Sandala RS. Deformation mechanims of two-phase titanium alloys. [Doctoral Dissertation]. University of Manchester; 2014. Available from: https://www.research.manchester.ac.uk/portal/en/theses/deformation-mechanims-of-twophase-ttitanium-alloys(50a395c3-70f6-49f7-a3df-41d2f899a851).html ; http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.607111

University of New South Wales

21. Hageman, Daniel. A novel approach to the 'pressing problem' of lymphoedema - engineering a foundation for clinical standards and efficacy-based compression therapy.

Degree: Faculty of Engineering, 2019, University of New South Wales

URL: http://handle.unsw.edu.au/1959.4/61757

► Lymphoedema, particularly as manifested in a secondary form following previous intervention or trauma, is a progressive and debilitating disorder, embodied through the gradual volumetric swelling… (more)

▼ Lymphoedema, particularly as manifested in a secondary form following previous intervention or trauma, is a progressive and debilitating disorder, embodied through the gradual volumetric swelling of a patient’s limb(s), often leading to fibrosis as well as loss of limb function in extreme cases. Compression-based therapy, the most prevalent prophylaxis and post-onset treatment approach for lymphoedema, has shown only limited success. A clear lack of standards, i.e., guidelines insuring consistency of structure and function of lymphoedema compression sleeves, hinders progress toward finding a cure for lymphoedema and prevents testing of sleeve efficacy. The body of work included in this thesis highlights the specific areas of focus necessary to move the field forward and sets a path towards comprehensive profiling of compression sleeves, to understand the underlying mechanisms relevant to efficacious treatment at the interface of the sleeve and skin. Current high-resolution commercial pressure sensors proved ineffective for measurement of spatial and temporal pressure profiles of sleeves in situ; limitations of such compliant sensors, and specific areas of needed improvement, were identified. Promising prototypes of flexible, high-resolution custom sensors were also assessed, with preliminary data and their shortfalls leading to definition of technical specifications for the future. Finally, a Digital Image Correlation (DIC)-based approach was applied to map strains of compression sleeves in high resolution and in situ. The DIC-method platform was tested and validated as a means to provide qualitative and quantitative characterisation of compression sleeves as a function of sleeve size, class, and manufacturer independent of lymphoedema state. Unexpected differences in pressure profiles underscore the need for both standardisation of sleeve design as well as follow on studies testing sleeve function in lymphoedema patients. Looking toward the future, testing of efficacy and head-to-head comparison of standardised and bespoke garments will better enable mechanistic understanding of lymphoedema's aetiology, unraveling how the ‘global’ disease state emerges from ‘local’ events, leading to a basis for lymphoedema prevention in the future. Advisors/Committee Members: Knothe Tate, Melissa, Faculty of Engineering, UNSW, Gardner, Lauren, Faculty of Engineering, UNSW, Kilbreath, Sharon, Sydney University, Rockson, Stanley, Stanford University Hospitals.

Subjects/Keywords: Digital Image Correlation; Lymphoedema; Compression sleeves; DIC

Record Details Similar Records Cite « Share

❌

APA · Chicago · MLA · Vancouver · CSE | Export to Zotero / EndNote / Reference Manager

APA (6^th Edition):

Hageman, D. (2019). A novel approach to the 'pressing problem' of lymphoedema - engineering a foundation for clinical standards and efficacy-based compression therapy. (Doctoral Dissertation). University of New South Wales. Retrieved from http://handle.unsw.edu.au/1959.4/61757

Chicago Manual of Style (16^th Edition):

Hageman, Daniel. “A novel approach to the 'pressing problem' of lymphoedema - engineering a foundation for clinical standards and efficacy-based compression therapy.” 2019. Doctoral Dissertation, University of New South Wales. Accessed February 27, 2021. http://handle.unsw.edu.au/1959.4/61757.

MLA Handbook (7^th Edition):

Hageman, Daniel. “A novel approach to the 'pressing problem' of lymphoedema - engineering a foundation for clinical standards and efficacy-based compression therapy.” 2019. Web. 27 Feb 2021.

Vancouver:

Hageman D. A novel approach to the 'pressing problem' of lymphoedema - engineering a foundation for clinical standards and efficacy-based compression therapy. [Internet] [Doctoral dissertation]. University of New South Wales; 2019. [cited 2021 Feb 27]. Available from: http://handle.unsw.edu.au/1959.4/61757.

Council of Science Editors:

Hageman D. A novel approach to the 'pressing problem' of lymphoedema - engineering a foundation for clinical standards and efficacy-based compression therapy. [Doctoral Dissertation]. University of New South Wales; 2019. Available from: http://handle.unsw.edu.au/1959.4/61757

22. Caille, Laetitia. Méthodes de régularisation évanescente pour la complétion de données : Fading regularization methods for data completion.

Degree: Docteur es, Mécanique des solides, génie mecanique, productique, transport et génie civil, 2018, Normandie

URL: http://www.theses.fr/2018NORMC231

►

Les problèmes de complétion de données interviennent dans divers domaines de la physique, tels que la mécanique, l'acoustique ou la thermique. La mesure directe des… (more)

▼

Les problèmes de complétion de données interviennent dans divers domaines de la physique, tels que la mécanique, l'acoustique ou la thermique. La mesure directe des conditions aux limites se heurte souvent à l'impossibilité de placer l'instrumentation adéquate. La détermination de ces données n'est alors possible que grâce à des informations complémentaires. Des mesures surabondantes sur une partie accessible de la frontière mènent à la résolution d'un problème inverse de type Cauchy. Cependant, dans certains cas, des mesures directes sur la frontière sont irréalisables, des mesures de champs plus facilement accessibles permettent de pallier ce problème. Cette thèse présente des méthodes de régularisation évanescente qui permettent de trouver, parmi toutes les solutions de l'équation d'équilibre, la solution du problème de complétion de données qui s'approche au mieux des données de type Cauchy ou de champs partiels. Ces processus itératifs ne dépendent pas d'un coefficient de régularisation et sont robustes vis à vis du bruit sur les données, qui sont recalculées et de ce fait débruitées. Nous nous intéressons, dans un premier temps, à la résolution de problèmes de Cauchy associés à l'équation d'Helmholtz. Une étude numérique complète est menée, en utilisant la méthode des solutions fondamentales en tant que méthode numérique pour discrétiser l'espace des solutions de l'équation d'Helmholtz. Des reconstructions précises attestent de l'efficacité et de la robustesse de la méthode. Nous présentons, dans un second temps, la généralisation de la méthode de régularisation évanescente aux problèmes de complétion de données à partir de mesures de champs partielles. Des simulations numériques, pour l'opérateur de Lamé, dans le cadre des éléments finis et des solutions fondamentales, montrent la capacité de la méthode à compléter et débruiter des données partielles de champs de déplacements et à identifier les conditions aux limites en tout point de la frontière. Nous retrouvons des reconstructions précises et un débruitage efficace des données lorsque l'algorithme est appliqué à des mesures réelles issues de corrélation d'images numériques. Un éventuel changement de comportement du matériau est détecté grâce à l'analyse des résidus de déplacements.

Data completion problems occur in many engineering fields, such as mechanical, acoustical and thermal sciences. Direct measurement of boundary conditions is often confronting with the impossibility of placing the appropriate instrumentation. The determination of these data is then possible only through additional informations. Overprescribed measurements on an accessible part of the boundary lead to the resolution of an inverse Cauchy problem. However, in some cases, direct measurements on the boundary are inaccessible, to overcome this problem field measurements are more easily accessible. This thesis presents fading regularization methods that allow to find, among all the solutions of the equilibrium equation, the solution of the data completion problem which fits at best…

Advisors/Committee Members: Delvare, Franck (thesis director).

Subjects/Keywords: Problèmes de complétion de donnée; Régularisation; Méthode des solutions fondamentales; Inverse problems; Cauchy problems; Data completion problems; Regularization, Method of fundamental solutions; Finite element method; Digital Image Correlation

Record Details Similar Records Cite « Share

❌

APA · Chicago · MLA · Vancouver · CSE | Export to Zotero / EndNote / Reference Manager

APA (6^th Edition):

Caille, L. (2018). Méthodes de régularisation évanescente pour la complétion de données : Fading regularization methods for data completion. (Doctoral Dissertation). Normandie. Retrieved from http://www.theses.fr/2018NORMC231

Chicago Manual of Style (16^th Edition):

Caille, Laetitia. “Méthodes de régularisation évanescente pour la complétion de données : Fading regularization methods for data completion.” 2018. Doctoral Dissertation, Normandie. Accessed February 27, 2021. http://www.theses.fr/2018NORMC231.

MLA Handbook (7^th Edition):

Caille, Laetitia. “Méthodes de régularisation évanescente pour la complétion de données : Fading regularization methods for data completion.” 2018. Web. 27 Feb 2021.

Vancouver:

Caille L. Méthodes de régularisation évanescente pour la complétion de données : Fading regularization methods for data completion. [Internet] [Doctoral dissertation]. Normandie; 2018. [cited 2021 Feb 27]. Available from: http://www.theses.fr/2018NORMC231.

Council of Science Editors:

Caille L. Méthodes de régularisation évanescente pour la complétion de données : Fading regularization methods for data completion. [Doctoral Dissertation]. Normandie; 2018. Available from: http://www.theses.fr/2018NORMC231

Queens University

23. Murray, Christopher. Dynamic Monitoring of Rail and Bridge Displacements Using Digital Image Correlation .

Degree: Civil Engineering, 2013, Queens University

URL: http://hdl.handle.net/1974/8323

► Rail and bridge infrastructure assets are critical elements of Canada’s transportation network and their continued efficient and safe operation is necessary to ensure the nation’s… (more)

▼ Rail and bridge infrastructure assets are critical elements of Canada’s transportation network and their continued efficient and safe operation is necessary to ensure the nation’s economic livelihood. Monitoring technologies that can detect changes in performance as well as precursors to failure are an important element of ensuring this efficient and safe operation. Digital Image Correlation (DIC) is a monitoring technology that has the potential to provide critical data for infrastructure assessment and to replace various conventional sensors with one integrated monitoring solution. In this research, the accuracy of DIC is evaluated using numerical, laboratory and field-based experiments. The sources of error of particular relevance to dynamic measurement using DIC are identified as (i) bias error in the sub-pixel interpolation scheme, (ii) the ratio of sample rate to the frequency of the signal being monitoring and (iii) the signal to noise ratio. It is also shown that the chosen sub-pixel interpolation scheme can greatly affect the accuracy of dynamic measurements. The use of DIC was investigated for field monitoring of both horizontal and vertical railway displacements at sites with good and poor subgrade conditions under dynamic train loading. It is shown that there is a significant benefit to using an absolute displacement measurement system rather than a relative displacement measurement system as the former can capture irrecoverable rail displacements in both the vertical and horizontal directions. Finally, DIC was also used for field monitoring of a very stiff reinforced concrete bridge during static and dynamic load tests. It is shown that when using DIC for deflection monitoring, corrections may have to be made to compensate for errors such as camera jitter and drift to acquire the most accurate results. Two potential correction methods were the use of a fixed reference point and generating composite images using average pixel intensity values from multiple images. It was found that using a fixed reference point was the optimal choice in this bridge test. It is concluded that DIC can be used as an effective displacement measurement tool for bridge assessment because it shows excellent correlation with linear potentiometer results and it can allow measurements to be taken without having to close the bridge.

Subjects/Keywords: Railway ; Bridge ; Particle Image Velocimetry ; Monitoring ; Accuracy ; Digital Image Correlation

Record Details Similar Records Cite « Share

❌

APA · Chicago · MLA · Vancouver · CSE | Export to Zotero / EndNote / Reference Manager

APA (6^th Edition):

Murray, C. (2013). Dynamic Monitoring of Rail and Bridge Displacements Using Digital Image Correlation . (Thesis). Queens University. Retrieved from http://hdl.handle.net/1974/8323

Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation

Chicago Manual of Style (16^th Edition):

Murray, Christopher. “Dynamic Monitoring of Rail and Bridge Displacements Using Digital Image Correlation .” 2013. Thesis, Queens University. Accessed February 27, 2021. http://hdl.handle.net/1974/8323.

Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation

MLA Handbook (7^th Edition):

Murray, Christopher. “Dynamic Monitoring of Rail and Bridge Displacements Using Digital Image Correlation .” 2013. Web. 27 Feb 2021.

Vancouver:

Murray C. Dynamic Monitoring of Rail and Bridge Displacements Using Digital Image Correlation . [Internet] [Thesis]. Queens University; 2013. [cited 2021 Feb 27]. Available from: http://hdl.handle.net/1974/8323.

Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation

Council of Science Editors:

Murray C. Dynamic Monitoring of Rail and Bridge Displacements Using Digital Image Correlation . [Thesis]. Queens University; 2013. Available from: http://hdl.handle.net/1974/8323

Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation

24. Teguedi, Mohamed Cheikh. Comportement local des enrobés recyclés : apport des mesures de champs cinématiques : Local behavior of recycled asphalt pavement : contribution of full-field measurements.

Degree: Docteur es, Génie Civil, 2017, Clermont Auvergne

URL: http://www.theses.fr/2017CLFAC032

►

Les enrobés bitumineux sont des matériaux composites complexes constitués de plusieurs phases : granulats, liants bitumineux et vides. L'assemblage de ces phases définit une microstructure… (more)

▼

Les enrobés bitumineux sont des matériaux composites complexes constitués de plusieurs phases : granulats, liants bitumineux et vides. L'assemblage de ces phases définit une microstructure très complexe qui pilote la réponse macroscopique des enrobés. Classiquement, les réponses mécanique et thermique des enrobés sont caractérisées par des essais à l'échelle macroscopique en supposant que le matériau est homogène et isotrope. À l’échelle des constituants, la caractérisation de ces matériaux nécessite d’utiliser une technique de mesure disposant simultanément d’une bonne résolution spatiale et d’une bonne résolution de mesure. L’enjeu de ce travail est d’une part d’évaluer les possibilités d’utilisation de la méthode de la grille (MG) pour l’analyse des propriétés thermo-mécaniques des enrobés bitumineux, et d’autre part de caractériser, grâce à l’apport de cette méthode, l’effet de l’introduction d’agrégats d’enrobés (AE). L’étude expérimentale comprend des essais de compression et de traction ainsi que des essais de gel-dégel. Les champs cinématiques issus de la MG ont permis d'étudier la réponse de ces matériaux à des échelles allant de l’échelle du constituant jusqu’à celle de l’éprouvette. Les résultats obtenus ont également permis de valider une approche expérimentale innovante pour l’analyse des enrobés en permettant d’accéder à des informations fiables et riches à l’échelle de la microstructure. Certains aspects liés à l'impact du recyclage sur le comportement local de l’enrobé sont également fournis.

Asphalt mixtures are complex composite materials constituted of several phases, namely aggregates, bituminous binder and voids. The assembly of these phases defines a highly complex microstructure, which drives the macroscopic response of asphalt mixtures. Classically, both the mechanical and the thermal responses of asphalt materials are characterized by using experiments at the scale of the mixture assuming that the material is homogeneous. At the scale of their constituents, these materials require a measurement technique featuring simultaneously both a good spatial resolution and a good strain resolution. To date, there are only few experimental studies available in the literature that describe the thermal and mechanical behavior of bituminous mixes at the scale of the constituent. The aim of this work is, on the one hand, to evaluate the possibilities of using the grid method (GM) for the analysis of the thermo-mechanical properties of asphalt mixtures and, on the other hand, to characterize the effect of the recycled asphalt pavement (RAP) inclusion on the local behavior of these materials. Full-field measurements provided by GM allow to study the response of these materials at scales ranging from the component to the mixture itself. These results enable us to validate an innovative experimental approach for the analysis of asphalts. It gives access to reliable and rich information at the scale of the microstructure. Some aspects related to the impact of RAP on the local behavior of asphalt were also…

Advisors/Committee Members: Toussaint, Evelyne (thesis director), Grédiac, Michel (thesis director).

Subjects/Keywords: Enrobé; Agrégats; Méthode de la grille; Corrélation d'images numériques; Gel-dégel; Comportement local; Asphalt; Recycled; RAP; Full-field measurement; Grid method; Digital image correlation; DIC; Freeze-thaw; Local behavior

Record Details Similar Records Cite « Share

❌

APA · Chicago · MLA · Vancouver · CSE | Export to Zotero / EndNote / Reference Manager

APA (6^th Edition):

Teguedi, M. C. (2017). Comportement local des enrobés recyclés : apport des mesures de champs cinématiques : Local behavior of recycled asphalt pavement : contribution of full-field measurements. (Doctoral Dissertation). Clermont Auvergne. Retrieved from http://www.theses.fr/2017CLFAC032

Chicago Manual of Style (16^th Edition):

Teguedi, Mohamed Cheikh. “Comportement local des enrobés recyclés : apport des mesures de champs cinématiques : Local behavior of recycled asphalt pavement : contribution of full-field measurements.” 2017. Doctoral Dissertation, Clermont Auvergne. Accessed February 27, 2021. http://www.theses.fr/2017CLFAC032.

MLA Handbook (7^th Edition):

Teguedi, Mohamed Cheikh. “Comportement local des enrobés recyclés : apport des mesures de champs cinématiques : Local behavior of recycled asphalt pavement : contribution of full-field measurements.” 2017. Web. 27 Feb 2021.

Vancouver:

Teguedi MC. Comportement local des enrobés recyclés : apport des mesures de champs cinématiques : Local behavior of recycled asphalt pavement : contribution of full-field measurements. [Internet] [Doctoral dissertation]. Clermont Auvergne; 2017. [cited 2021 Feb 27]. Available from: http://www.theses.fr/2017CLFAC032.

Council of Science Editors:

Teguedi MC. Comportement local des enrobés recyclés : apport des mesures de champs cinématiques : Local behavior of recycled asphalt pavement : contribution of full-field measurements. [Doctoral Dissertation]. Clermont Auvergne; 2017. Available from: http://www.theses.fr/2017CLFAC032

Université Montpellier II

25. Baldit, Adrien. Etude des interactions hydro-chimio-mécaniques dans les tissus biologiques : application à la nutrition du disque intervertébral. : Analysis of hydro-chemo-mechanical interactions in biological tissues : application to the cell nutrition of intervertebral disc.

Degree: Docteur es, Mécanique et Génie civil, 2013, Université Montpellier II

URL: http://www.theses.fr/2013MON20066

►

Le disque intervertébral est principalement composé de deux types de tissu : le nucleus pulposus au centre contenu par l'annulus fibrosus en périphérie.Le nucleus est… (more)

▼

Le disque intervertébral est principalement composé de deux types de tissu : le nucleus pulposus au centre contenu par l'annulus fibrosus en périphérie.Le nucleus est relativement bien décrit dans la littérature contrairement à l'annulus dont la constitution bi-phasique couplée à une structure à fibres orientées reste délicate à modéliser. La caractérisation hydro-chimio-mécanique représente un point clé dans la compréhension des phénomènes qui régissent le comportement de l'organe.Pour répondre au manque d'information, deux axes de travail sont mis en place : expérimental et numérique.La réalisation de tests de traction cyclique associés à des techniques de corrélation d'images permet de fournir une base de données complète du comportement.Elle est ensuite utilisée pour identifier un modèle hydro-chimio-mécanique qui traduit le comportement non-linéaire, anisotrope, dissipatif ainsi que la sensibilité aux variations d'environnement chimique du tissu observés expérimentalement.L'intérêt majeur de cette méthode est l'identification simultanée de l'ensemble des paramètres du modèle au cours de sollicitations proches des conditions physiologiques sur chacune des éprouvettes.Ce protocole réduit ainsi les incertitudes liées aux variabilités inter-individus et inter-localisations pour obtenir des valeurs de paramètres plus fiables.La formulation identifiée permettra de proposer un modèle compréhensif des transferts de fluide impliqués dans les processus de nutrition cellulaire.Ce sujet s'intègre dans une réflexion plus large relative à la compréhension des couplages hydro-chimio-mécaniques dans les tissus biologiques.L'enjeu est de quantifier l'impact des stimuli mécaniques sur l'évolution des tissus humains et leur adaptation aux conditions environnementales.

Intervertebral disc is mainly divided into two parts : nucleus pulposus surrounding by annulus fibrosus.Nucleus is relatively well described in literature, on the other hand annulus remains difficult to model due to its bi-phasic constitution coupled with an oriented fibres structure.Hydro-chemo-mechanical characterization represent a key point to reach a better understanding of this organ.To overcome this lack of knowledge, two axes are developed in this work : experimental and numerical.Cyclic tensile tests associated to digital image correlation techniques allow to obtain a large amount of data on global tissue behaviour.It permit to identify a hydro-chemo-mechanical model which takes in account the non-linear, anisotropic and dissipative behaviours.It also highlights sensibility to chemical variations in tissue environment observed experimentally.The most important point of this work is the simultaneous parameter identification performed on each sample during solicitations similar to in vivo conditions.This protocol reduce inter-individuals and inter-localisations discrepancies and leads to an accurate bundle of parameters.The formulation aims to accurately model fluid motion inside intervertebral disc tissues which is related to cell nutrition, growth and…

Advisors/Committee Members: Cherblanc, Fabien (thesis director).

Subjects/Keywords: Biomécanique; Tissus mous; Disque intervertébral; Hydro-chimio-mécanique; Corrélation d\'images; Méthode inverse; Biomechanic; Softs tissues; Intervertebral disc; Hydro-chemo-mechanics; Digital image correlation; Inverse method

Record Details Similar Records Cite « Share

❌

APA · Chicago · MLA · Vancouver · CSE | Export to Zotero / EndNote / Reference Manager

APA (6^th Edition):

Baldit, A. (2013). Etude des interactions hydro-chimio-mécaniques dans les tissus biologiques : application à la nutrition du disque intervertébral. : Analysis of hydro-chemo-mechanical interactions in biological tissues : application to the cell nutrition of intervertebral disc. (Doctoral Dissertation). Université Montpellier II. Retrieved from http://www.theses.fr/2013MON20066

Chicago Manual of Style (16^th Edition):

Baldit, Adrien. “Etude des interactions hydro-chimio-mécaniques dans les tissus biologiques : application à la nutrition du disque intervertébral. : Analysis of hydro-chemo-mechanical interactions in biological tissues : application to the cell nutrition of intervertebral disc.” 2013. Doctoral Dissertation, Université Montpellier II. Accessed February 27, 2021. http://www.theses.fr/2013MON20066.

MLA Handbook (7^th Edition):

Baldit, Adrien. “Etude des interactions hydro-chimio-mécaniques dans les tissus biologiques : application à la nutrition du disque intervertébral. : Analysis of hydro-chemo-mechanical interactions in biological tissues : application to the cell nutrition of intervertebral disc.” 2013. Web. 27 Feb 2021.

Vancouver:

Baldit A. Etude des interactions hydro-chimio-mécaniques dans les tissus biologiques : application à la nutrition du disque intervertébral. : Analysis of hydro-chemo-mechanical interactions in biological tissues : application to the cell nutrition of intervertebral disc. [Internet] [Doctoral dissertation]. Université Montpellier II; 2013. [cited 2021 Feb 27]. Available from: http://www.theses.fr/2013MON20066.

Council of Science Editors:

Baldit A. Etude des interactions hydro-chimio-mécaniques dans les tissus biologiques : application à la nutrition du disque intervertébral. : Analysis of hydro-chemo-mechanical interactions in biological tissues : application to the cell nutrition of intervertebral disc. [Doctoral Dissertation]. Université Montpellier II; 2013. Available from: http://www.theses.fr/2013MON20066

26. Affagard, Jean-Sébastien. Identification des propriétés hyperélastiques des muscles de la cuisse à l'état passif : couplage des techniques de corrélation d'images aux techniques d'imagerie médicale : Identification of the hyperelastic properties of the passive thigh muscles : coupling of the image correlation with medical imaging techniques.

Degree: Docteur es, Bio-Ingénierie, Biomécanique, Biomatériaux, 2013, Compiègne

URL: http://www.theses.fr/2013COMP2102

►

La compréhension du comportement musculaire est un champ d’investigation primordial dans divers domaines tels que le sport, le crash automobile et la médecine. Peu de… (more)

▼

La compréhension du comportement musculaire est un champ d’investigation primordial dans divers domaines tels que le sport, le crash automobile et la médecine. Peu de techniques in vivo permettent aujourd’hui de caractériser les propriétés mécaniques du muscle. Aussi, l’objectif de ce travail est de développer une méthode d’identification in vivo à partir demesures de champs de déplacement. La méthode d’identification est composée de 3 étapes interdépendantes. La première consiste à réaliser une IRM de la cuisse pour segmenter manuellement différents tissus musculaires (quadriceps, ischios, gracilis et sartorius) et le tissu adipeux. Un comportement Néo-Hookéen est choisi pour modéliser le comportement hyperélastique (C10, D). Dans un second temps, un dispositif expérimental de compression est développé pour mesurer le champ de déplacement in vivo à partir des techniques d’imagerie échographique et de Corrélation d’Images Numériques. Finalement, une méthode inverse est mise en œuvre pour identifier les paramètres C10 et D de chaque tissu. Par le biais d’un exemple numérique, l’erreur sur les paramètres identifiés est évaluée. Les cartographies des champs de déplacement expérimentaux confirment les observations qualitatives obtenues sur les images échographiques et sont validées par les champs de déformation obtenus par approximation diffuse. Une faible erreur d’identification (C10<3%, D<7%) est obtenue à partir de l’exemple numérique, et les paramètres mécaniques identifiés sont en accord avec la littérature. Ces résultats valident la démarche inverse mise en œuvre qui permettra, à terme, de suivre l’évolution des pathologies et de mener des simulations prédictives.

The understanding of the mechanical behavior of the muscle tissue is an important field of investigation with different applications in medicine, car crash and sport. Currently, few in vivo imaging techniques are able to characterize the mechanical properties of muscle. Thus, this study aims at developing an in vivo identification method based on displacement fieldmeasurements. The identification approach is composed of 3 dependent steps. The first step consists in performing a 2D MRI acquisition of the thigh in order to segment manually the muscle (quadriceps, ischio, gracilis and sartorius) and fat tissues. A Neo-Hookean model is chosen to characterize the hyperelastic behavior (C10, D). Secondly, an experimental compressiondevice is developed to measure the in vivo displacement field using ultrasound and Digital Image Correlation (DIC) techniques. Finally, an inverse method is implemented to identify the C10 and D parameters of each soft tissue. A numerical example is used to quantify the identification error on each parameter. Displacement field measurements confirm the ultrasound observations. They are also validated by the cartographies of the strain fields, which are obtained by the diffuse approximation method. Using the numerical example, the identification leads to low errors on the C10 (< 3%) and D (< 7%) parameters. Identified values of the…

Advisors/Committee Members: Bensamoun, Sabine (thesis director), Feissel, Pierre (thesis director).

Subjects/Keywords: Propriétés mécaniques in vivo; Muscles de la cuisse; Hyperélasticité; Corrélation d'images numériques (CIN); Méthode inverse; In vivo mechanical properties; Thigh muscles; Digital Image correlation (DIC); Medical imaging; Inverse method

Record Details Similar Records Cite « Share

❌

APA · Chicago · MLA · Vancouver · CSE | Export to Zotero / EndNote / Reference Manager

APA (6^th Edition):

Affagard, J. (2013). Identification des propriétés hyperélastiques des muscles de la cuisse à l'état passif : couplage des techniques de corrélation d'images aux techniques d'imagerie médicale : Identification of the hyperelastic properties of the passive thigh muscles : coupling of the image correlation with medical imaging techniques. (Doctoral Dissertation). Compiègne. Retrieved from http://www.theses.fr/2013COMP2102

Chicago Manual of Style (16^th Edition):

Affagard, Jean-Sébastien. “Identification des propriétés hyperélastiques des muscles de la cuisse à l'état passif : couplage des techniques de corrélation d'images aux techniques d'imagerie médicale : Identification of the hyperelastic properties of the passive thigh muscles : coupling of the image correlation with medical imaging techniques.” 2013. Doctoral Dissertation, Compiègne. Accessed February 27, 2021. http://www.theses.fr/2013COMP2102.

MLA Handbook (7^th Edition):

Affagard, Jean-Sébastien. “Identification des propriétés hyperélastiques des muscles de la cuisse à l'état passif : couplage des techniques de corrélation d'images aux techniques d'imagerie médicale : Identification of the hyperelastic properties of the passive thigh muscles : coupling of the image correlation with medical imaging techniques.” 2013. Web. 27 Feb 2021.

Vancouver:

Affagard J. Identification des propriétés hyperélastiques des muscles de la cuisse à l'état passif : couplage des techniques de corrélation d'images aux techniques d'imagerie médicale : Identification of the hyperelastic properties of the passive thigh muscles : coupling of the image correlation with medical imaging techniques. [Internet] [Doctoral dissertation]. Compiègne; 2013. [cited 2021 Feb 27]. Available from: http://www.theses.fr/2013COMP2102.

Council of Science Editors:

Affagard J. Identification des propriétés hyperélastiques des muscles de la cuisse à l'état passif : couplage des techniques de corrélation d'images aux techniques d'imagerie médicale : Identification of the hyperelastic properties of the passive thigh muscles : coupling of the image correlation with medical imaging techniques. [Doctoral Dissertation]. Compiègne; 2013. Available from: http://www.theses.fr/2013COMP2102

The Ohio State University

27. Wildofsky, Jacob. Multi-Scale Computational Modeling of Ni-Base Superalloy Brazed Joints for Gas Turbine Applications.

Degree: MS, Welding Engineering, 2019, The Ohio State University

URL: http://rave.ohiolink.edu/etdc/view?acc_num=osu1574809064215922

► Brazing is a unique process capable of joining materials with minimal damage to the base material properties. Ni-base superalloy brazed joints are used for the… (more)

▼ Brazing is a unique process capable of joining materials with minimal damage to the base material properties. Ni-base superalloy brazed joints are used for the manufacture and repair of high temperature gas turbine engines. However, the mechanical behavior of the brazed joint microstructure is still not fully understood. In addition, there are no standard test methods that include correction factors for the stress concentrations, high tri-axial stress, and potential defects that can reduce the strength of a brazed joint. This project’s goal was to develop a multi-scale model including the damage zone method for the prediction of brazed joint mechanical behavior by investigating shear and tensile loading conditions. The study investigated the impact of a variable braze joint geometry (lap, butt, and pin-in-collar), type of loading (tensile or shear), and form of braze filler metal (foil or paste) had on the mechanical performance of IN718/BNi-2 braze joints. The damage zone method was applied to model and predict the strain concentrations and joint strength of the brazed test samples using finite element analysis in Abaqus software and was validated through digital image correlation measurements. Ultrasonic immersion non-destructive flaw inspection and scanning election microscope fractography work was also completed to better understand the failure mechanisms and their correlation to the microstructure and quality of the brazed joints. Although all sample sets increased in strength with increasing joint area, changes in sample geometry, microstructure, and joint quality impacted the magnitude of the strength. Thermal cycle testing determined that a brazing temperature of 1065 °C, a hold time of 10 minutes, and a joint gap of 75 um or lower is required to maintain a volume of fraction of brittle eutectic intermetallics below 10%. Applying the damage zone model to the foil type experimental results, the failure load was predicted for both double lap and pin-in-collar shear geometries using a single 0.5% maximum principle strain failure criterion at 0.015-in. damage zone length. The single lap shear geometry damage zone criteria differed, requiring an increased 0.6% maximum principle with twice the damage zone length. Overall, the individual damage zone model for each shear sample geometry successfully predicted the failure load with a higher accuracy than the current AWS C3.2 standard. A final set of modeling guidelines have been listed for the development and application of the damage zone method for brazed joints. Advisors/Committee Members: Alexandrov, Boian (Advisor), Benatar, Avraham (Advisor).

Subjects/Keywords: Engineering; Materials Science; Mechanical Engineering; Brazed Joints, Mechanical Properties, Modeling, Damage Zone Method, Nickel Supperalloys, Ultrasonic Non-destructive testing, Digital image correlation, Fractograghy

Record Details Similar Records Cite « Share

❌

APA · Chicago · MLA · Vancouver · CSE | Export to Zotero / EndNote / Reference Manager

APA (6^th Edition):

Wildofsky, J. (2019). Multi-Scale Computational Modeling of Ni-Base Superalloy Brazed Joints for Gas Turbine Applications. (Masters Thesis). The Ohio State University. Retrieved from http://rave.ohiolink.edu/etdc/view?acc_num=osu1574809064215922

Chicago Manual of Style (16^th Edition):

Wildofsky, Jacob. “Multi-Scale Computational Modeling of Ni-Base Superalloy Brazed Joints for Gas Turbine Applications.” 2019. Masters Thesis, The Ohio State University. Accessed February 27, 2021. http://rave.ohiolink.edu/etdc/view?acc_num=osu1574809064215922.

MLA Handbook (7^th Edition):

Wildofsky, Jacob. “Multi-Scale Computational Modeling of Ni-Base Superalloy Brazed Joints for Gas Turbine Applications.” 2019. Web. 27 Feb 2021.

Vancouver:

Wildofsky J. Multi-Scale Computational Modeling of Ni-Base Superalloy Brazed Joints for Gas Turbine Applications. [Internet] [Masters thesis]. The Ohio State University; 2019. [cited 2021 Feb 27]. Available from: http://rave.ohiolink.edu/etdc/view?acc_num=osu1574809064215922.

Council of Science Editors:

Wildofsky J. Multi-Scale Computational Modeling of Ni-Base Superalloy Brazed Joints for Gas Turbine Applications. [Masters Thesis]. The Ohio State University; 2019. Available from: http://rave.ohiolink.edu/etdc/view?acc_num=osu1574809064215922

28. Pétureau, Louis. Stratégie de couplage expérimentation/modélisation dans les matériaux hétérogènes. Identification de propriétés mécaniques locales : Experimentation/modelisation coupling strategies in heterogeneous materials. Identification of local elastic mechanical properties.

Degree: Docteur es, Mécanique des Solides, des Matériaux, des Structures et des Surfaces, 2018, Poitiers

URL: http://www.theses.fr/2018POIT2307

►

Le développement de méthodes d’identification de paramètres de lois de comportement de matériaux est devenu primordial pour avoir accès à la connaissance complète du comportement.… (more)

▼

Le développement de méthodes d’identification de paramètres de lois de comportement de matériaux est devenu primordial pour avoir accès à la connaissance complète du comportement. En effet, les méthodes de mesure optiques, comme la Corrélation d’Images Numériques, permettent d’obtenir les quantités cinématiques de la relation de comportement sous forme de champs de vecteurs. En revanche, les contraintes ne sont généralement pas mesurables et il est nécessaire d’identifier les paramètres de la loi de comportement du matériau considéré pour y avoir accès. Plusieurs méthodes ont vu le jour et permettent de répondre à cette problématique mais la plupart d’entre elles supposent une homogénéité du matériau. Ce mémoire traite de l’application de certaines de ces méthodes, notamment la méthode de l’écart à l’équilibre (MEQ) et la méthode de recalage de modèle éléments finis (MREF), dans des matériaux hétérogènes à microstructure complexe où les propriétés mécaniques évoluent spatialement dans le volume. L’objectif est d’identifier ces propriétés mécaniques locales qui régissent la cinématique mesurée de tels matériaux dans le cadre de l’élasticité linéaire isotrope. Dans un premier temps, les deux méthodes citées sont décrites, implémentées et comparées sur des cas simulés en 2D. La MREF est préférée à la MEQ car plus robuste vis-à-vis des incertitudes de mesure. Basée sur un formalisme itératif, une parallélisation de l’algorithme a été opérée pour diminuer le coût en temps de la méthode. Des expérimentations dans le plan sur des éprouvettes en polyuréthane où les hétérogénéités sont maîtrisées ont permis de valider la méthode. Enfin, deux applications en 3D sur un matériau en mousse polyuréthane et un composite à base de fibres de bois démontrent l’intérêt d’une telle méthode pour l’identification de propriétés mécaniques locales. La mise en évidence d’une relation entre les propriétés locales identifiées et les propriétés locales de la microstructure de ces matériaux est effectuée.

The development of identification methods of material constitutive equation parameters has become fundamental to completely know the mechanical behavior. Indeed, optical methods, such as Digital Image Correlation, allows to get kinematics quantities of the constitutive equation as vectors fields. But, stresses are usually not available experimentally and one has to identify constitutive equation parameters to compute them. Several methods have been developed and answer to that problematic but most of them suppose the materials as homogeneous. This memoir is about the application of some of these methods, such as the equilibrium gap method (EGM) and the finite element model updating method (FEMU), in the case of heterogeneous materials with complex structures where mechanical properties vary spatially in the volume. The objective is to identify these local mechanical properties which rule the measured kinematics of such materials considering the isotropic linear elasticity. Firstly, both methods are detailed, implemented and compared on 2D…

Advisors/Committee Members: Brémand, Fabrice (thesis director), Doumalin, Pascal (thesis director).

Subjects/Keywords: Identification; Élasticité linéaire isotrope; Corrélation d'images numériques; Corrélation d’images volumiques; Méthode des éléments finis; Matériaux hétérogènes.; Isotropic linear elasticity; Digital image correlation; Digital volume correlation; Finite element method; Heterogeneous materials.; 620.112

Record Details Similar Records Cite « Share

❌

APA · Chicago · MLA · Vancouver · CSE | Export to Zotero / EndNote / Reference Manager

APA (6^th Edition):

Pétureau, L. (2018). Stratégie de couplage expérimentation/modélisation dans les matériaux hétérogènes. Identification de propriétés mécaniques locales : Experimentation/modelisation coupling strategies in heterogeneous materials. Identification of local elastic mechanical properties. (Doctoral Dissertation). Poitiers. Retrieved from http://www.theses.fr/2018POIT2307

Chicago Manual of Style (16^th Edition):

Pétureau, Louis. “Stratégie de couplage expérimentation/modélisation dans les matériaux hétérogènes. Identification de propriétés mécaniques locales : Experimentation/modelisation coupling strategies in heterogeneous materials. Identification of local elastic mechanical properties.” 2018. Doctoral Dissertation, Poitiers. Accessed February 27, 2021. http://www.theses.fr/2018POIT2307.

MLA Handbook (7^th Edition):

Pétureau, Louis. “Stratégie de couplage expérimentation/modélisation dans les matériaux hétérogènes. Identification de propriétés mécaniques locales : Experimentation/modelisation coupling strategies in heterogeneous materials. Identification of local elastic mechanical properties.” 2018. Web. 27 Feb 2021.

Vancouver:

Pétureau L. Stratégie de couplage expérimentation/modélisation dans les matériaux hétérogènes. Identification de propriétés mécaniques locales : Experimentation/modelisation coupling strategies in heterogeneous materials. Identification of local elastic mechanical properties. [Internet] [Doctoral dissertation]. Poitiers; 2018. [cited 2021 Feb 27]. Available from: http://www.theses.fr/2018POIT2307.

Council of Science Editors:

Pétureau L. Stratégie de couplage expérimentation/modélisation dans les matériaux hétérogènes. Identification de propriétés mécaniques locales : Experimentation/modelisation coupling strategies in heterogeneous materials. Identification of local elastic mechanical properties. [Doctoral Dissertation]. Poitiers; 2018. Available from: http://www.theses.fr/2018POIT2307

NSYSU

29. Chu, Yu-tsung. DIC on the Thermal Expansion Coefficient Measurements of Palladium at Different Temperature Levels.

Degree: Master, Mechanical and Electro-Mechanical Engineering, 2014, NSYSU

URL: http://etd.lib.nsysu.edu.tw/ETD-db/ETD-search/view_etd?URN=etd-0731114-180308

► In traditional IC packaging, wire bonding is typically performed using gold. In recent years, increasing gold prices have motivated the packaging industry actively to develop… (more)

Subjects/Keywords: Cubic polynomial; Temperature effect; Thermal expansion coefficient; Palladium; Digital image correlation

Record Details Similar Records Cite « Share

❌

APA · Chicago · MLA · Vancouver · CSE | Export to Zotero / EndNote / Reference Manager

APA (6^th Edition):

Chu, Y. (2014). DIC on the Thermal Expansion Coefficient Measurements of Palladium at Different Temperature Levels. (Thesis). NSYSU. Retrieved from http://etd.lib.nsysu.edu.tw/ETD-db/ETD-search/view_etd?URN=etd-0731114-180308

Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation

Chicago Manual of Style (16^th Edition):

Chu, Yu-tsung. “DIC on the Thermal Expansion Coefficient Measurements of Palladium at Different Temperature Levels.” 2014. Thesis, NSYSU. Accessed February 27, 2021. http://etd.lib.nsysu.edu.tw/ETD-db/ETD-search/view_etd?URN=etd-0731114-180308.

Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation

MLA Handbook (7^th Edition):

Chu, Yu-tsung. “DIC on the Thermal Expansion Coefficient Measurements of Palladium at Different Temperature Levels.” 2014. Web. 27 Feb 2021.

Vancouver:

Chu Y. DIC on the Thermal Expansion Coefficient Measurements of Palladium at Different Temperature Levels. [Internet] [Thesis]. NSYSU; 2014. [cited 2021 Feb 27]. Available from: http://etd.lib.nsysu.edu.tw/ETD-db/ETD-search/view_etd?URN=etd-0731114-180308.

Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation

Council of Science Editors:

Chu Y. DIC on the Thermal Expansion Coefficient Measurements of Palladium at Different Temperature Levels. [Thesis]. NSYSU; 2014. Available from: http://etd.lib.nsysu.edu.tw/ETD-db/ETD-search/view_etd?URN=etd-0731114-180308

Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation

NSYSU

30. Gan, Jia-lun. Measurement of the Residual Stress in Cr-Film by Using DIC.

Degree: Master, Mechanical and Electro-Mechanical Engineering, 2015, NSYSU

URL: http://etd.lib.nsysu.edu.tw/ETD-db/ETD-search/view_etd?URN=etd-0725115-143720

► In the past, if a researcher intended to measure the residual stress in a thin film coated on a substrate, the Stoney's equation was adopted… (more)

Subjects/Keywords: digital image correlation; film thickness; residual stress; coating film; cantilever beam

Record Details Similar Records Cite « Share

❌

APA · Chicago · MLA · Vancouver · CSE | Export to Zotero / EndNote / Reference Manager

APA (6^th Edition):

Gan, J. (2015). Measurement of the Residual Stress in Cr-Film by Using DIC. (Thesis). NSYSU. Retrieved from http://etd.lib.nsysu.edu.tw/ETD-db/ETD-search/view_etd?URN=etd-0725115-143720

Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation

Chicago Manual of Style (16^th Edition):

Gan, Jia-lun. “Measurement of the Residual Stress in Cr-Film by Using DIC.” 2015. Thesis, NSYSU. Accessed February 27, 2021. http://etd.lib.nsysu.edu.tw/ETD-db/ETD-search/view_etd?URN=etd-0725115-143720.

Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation

MLA Handbook (7^th Edition):

Gan, Jia-lun. “Measurement of the Residual Stress in Cr-Film by Using DIC.” 2015. Web. 27 Feb 2021.

Vancouver:

Gan J. Measurement of the Residual Stress in Cr-Film by Using DIC. [Internet] [Thesis]. NSYSU; 2015. [cited 2021 Feb 27]. Available from: http://etd.lib.nsysu.edu.tw/ETD-db/ETD-search/view_etd?URN=etd-0725115-143720.

Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation

Council of Science Editors:

Gan J. Measurement of the Residual Stress in Cr-Film by Using DIC. [Thesis]. NSYSU; 2015. Available from: http://etd.lib.nsysu.edu.tw/ETD-db/ETD-search/view_etd?URN=etd-0725115-143720

Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation

		in
And / Or
		in
And / Or
		in
And / Or
		in

Open Access Theses and Dissertations