subject:(digital image correlation)

University of Alberta

1. 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

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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 June 26, 2019. 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. 26 Jun 2019.

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 2019 Jun 26]. 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

2. 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

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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 June 26, 2019. 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. 26 Jun 2019.

Vancouver:

Aswad MA. Residual Stress and Fracture in High Temperature Ceramics. [Internet] [Doctoral dissertation]. University of Manchester; 2012. [cited 2019 Jun 26]. 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

University of Alberta

3. 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

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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 June 26, 2019. https://era.library.ualberta.ca/files/v118rf025.

MLA Handbook (7^th Edition):

Melenka, Garrett W. “Three Dimensional Deformation of Orthodontic Brackets.” 2012. Web. 26 Jun 2019.

Vancouver:

Melenka GW. Three Dimensional Deformation of Orthodontic Brackets. [Internet] [Masters thesis]. University of Alberta; 2012. [cited 2019 Jun 26]. 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

4. 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

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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 June 26, 2019. 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. 26 Jun 2019.

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 2019 Jun 26]. 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

University of Manchester

5. 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

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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 June 26, 2019. 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. 26 Jun 2019.

Vancouver:

Sandala RS. Deformation mechanims of two-phase titanium alloys. [Internet] [Doctoral dissertation]. University of Manchester; 2014. [cited 2019 Jun 26]. 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

Penn State University

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

Degree: 2017, Penn State University

URL: https://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

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APA (6^th Edition):

Vidvans, A. (2017). A modified structure from motion framework based on smartphone imaging for 3D reconstruction of arbitrary shapes. (Thesis). Penn State University. Retrieved from https://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. “A modified structure from motion framework based on smartphone imaging for 3D reconstruction of arbitrary shapes.” 2017. Thesis, Penn State University. Accessed June 26, 2019. https://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. “A modified structure from motion framework based on smartphone imaging for 3D reconstruction of arbitrary shapes.” 2017. Web. 26 Jun 2019.

Vancouver:

Vidvans A. A modified structure from motion framework based on smartphone imaging for 3D reconstruction of arbitrary shapes. [Internet] [Thesis]. Penn State University; 2017. [cited 2019 Jun 26]. Available from: https://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 A. A modified structure from motion framework based on smartphone imaging for 3D reconstruction of arbitrary shapes. [Thesis]. Penn State University; 2017. Available from: https://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

7. 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

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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 June 26, 2019. 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. 26 Jun 2019.

Vancouver:

Aswad MA. Residual stress and fracture in high temperature ceramics. [Internet] [Doctoral dissertation]. University of Manchester; 2012. [cited 2019 Jun 26]. 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

Texas A&M University

8. Cornell, Stephen. Experimental Characterization of Shape Memory Alloys using Digital Image Correlation and Infra-Red Thermography.

Degree: 2015, Texas A&M University

URL: http://hdl.handle.net/1969.1/154987

► Characterization of shape memory alloy materials is demonstrated using modern full-field experimental techniques. The methods presented are designed to reduce the number of experiments required… (more)

Subjects/Keywords: Shape Memory Alloy; Digital Image Correlation; Infra-Red Thermography

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APA (6^th Edition):

Cornell, S. (2015). Experimental Characterization of Shape Memory Alloys using Digital Image Correlation and Infra-Red Thermography. (Thesis). Texas A&M University. Retrieved from http://hdl.handle.net/1969.1/154987

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):

Cornell, Stephen. “Experimental Characterization of Shape Memory Alloys using Digital Image Correlation and Infra-Red Thermography.” 2015. Thesis, Texas A&M University. Accessed June 26, 2019. http://hdl.handle.net/1969.1/154987.

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

MLA Handbook (7^th Edition):

Cornell, Stephen. “Experimental Characterization of Shape Memory Alloys using Digital Image Correlation and Infra-Red Thermography.” 2015. Web. 26 Jun 2019.

Vancouver:

Cornell S. Experimental Characterization of Shape Memory Alloys using Digital Image Correlation and Infra-Red Thermography. [Internet] [Thesis]. Texas A&M University; 2015. [cited 2019 Jun 26]. Available from: http://hdl.handle.net/1969.1/154987.

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

Council of Science Editors:

Cornell S. Experimental Characterization of Shape Memory Alloys using Digital Image Correlation and Infra-Red Thermography. [Thesis]. Texas A&M University; 2015. Available from: http://hdl.handle.net/1969.1/154987

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

The Ohio State University

9. Hutchinson, Nicholas W. Experimental input for the design of metallic glass/crystalline composites.

Degree: PhD, Materials Science and Engineering, 2013, The Ohio State University

URL: http://rave.ohiolink.edu/etdc/view?acc_num=osu1385512484

► Bulk metallic glasses often exhibit exceptional strength and large elastic strains, but the structural applications of bulk metallic glasses are limited by their extremely low… (more)

▼ Bulk metallic glasses often exhibit exceptional strength and large elastic strains, but the structural applications of bulk metallic glasses are limited by their extremely low tensile ductility. Below the glass transition temperature of the alloy, plastic deformation occurs primarily in narrow shear bands, which propagate unimpeded through the monolithic glass structure, resulting in catastrophic failure under tensile loading. A number of studies have added crystalline reinforcements to the glassy matrix in an effort to block shear band propagation and increase ductility. The reinforcements in these bulk metallic glass matrix composites (BMGMC’s) can be added as ex situ particles or fibers infiltrated by the glass- forming liquid, or can be formed in situ, either via devitrification of the glass during post-processing or as a second phase that precipitates from the melt during solidification . The size, distribution, and mechanical properties of the reinforcement phase have significant impact on the ductility of the composite. However, surprisingly little quantitative microstructural information is available for BMGMC’s, particularly those formed by precipitation from the melt.In this work, we examine two in situ BMGMC’s in which a ductile crystalline phase precipitates during solidification of the melt, resulting in a complex dendritic structure embedded in a continuous glass matrix. A 3D serial sectioning process was used to image the microstructure at regular intervals by removing slices of material using a dual beam focused ion – scanning electron microscope (FIB). Due to the complex nature of the microstructure, measurements of key features were conducted using a 3D measurement method that was developed for this purpose. Experiments were also conducted to provide experimental input for the development and tuning of finite element models. Changes in the elastic modulus of the composite were evaluated over a range of stresses that encompassed the yield point of the composite. An interesting increase in the modulus was observed prior to yielding. The work is concluded with a study of the accumulation of strain within the composite microstructure during tensile loading. The strain was determined and evaluated by a digital image correlation method. Advisors/Committee Members: Flores, Katharine (Advisor), Windl, Wolfgan (Advisor).

Subjects/Keywords: Materials Science; metallic glass; composite; microstructure; digital image correlation

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APA (6^th Edition):

Hutchinson, N. W. (2013). Experimental input for the design of metallic glass/crystalline composites. (Doctoral Dissertation). The Ohio State University. Retrieved from http://rave.ohiolink.edu/etdc/view?acc_num=osu1385512484

Chicago Manual of Style (16^th Edition):

Hutchinson, Nicholas W. “Experimental input for the design of metallic glass/crystalline composites.” 2013. Doctoral Dissertation, The Ohio State University. Accessed June 26, 2019. http://rave.ohiolink.edu/etdc/view?acc_num=osu1385512484.

MLA Handbook (7^th Edition):

Hutchinson, Nicholas W. “Experimental input for the design of metallic glass/crystalline composites.” 2013. Web. 26 Jun 2019.

Vancouver:

Hutchinson NW. Experimental input for the design of metallic glass/crystalline composites. [Internet] [Doctoral dissertation]. The Ohio State University; 2013. [cited 2019 Jun 26]. Available from: http://rave.ohiolink.edu/etdc/view?acc_num=osu1385512484.

Council of Science Editors:

Hutchinson NW. Experimental input for the design of metallic glass/crystalline composites. [Doctoral Dissertation]. The Ohio State University; 2013. Available from: http://rave.ohiolink.edu/etdc/view?acc_num=osu1385512484

University of Cincinnati

10. Nageswaran, Ashok R. Deformation Analysis of Soft Tissues by Digital Image Correlation.

Degree: MS, Engineering : Mechanical Engineering, 2009, University of Cincinnati

URL: http://rave.ohiolink.edu/etdc/view?acc_num=ucin1233614556

► Digital image correlation techniques are commonly used to evaluate deformation gradients from image sets by cross correlating pixel intensities. Recently, Bayesian framework based texture correlation… (more)

▼ Digital image correlation techniques are commonly used to evaluate deformation gradients from image sets by cross correlating pixel intensities. Recently, Bayesian framework based texture correlation technique have gained greater acceptance to study soft tissue deformation due to its ability to model noisy image data. Besides cross correlation, this probability based technique weighs regions of potential matches by radial distance from center of search region thereby eliminating large improbable displacements. Simple tension tests on soft tissue using magnetic resonance and ultrasound imaging modalities are presented. This initial study revealed encouraging results from ultrasound images compared to MR due to better a priori incremental image data. Having established a suitable imaging modality, plane strain tension and indentation tests were carried out on homogeneous (breast phantom) and non-homogeneous (muscle tissue) specimens and validated using optical images with surface markers. The specimens were deformed up to 10 mm in tension and indentation modes. The root mean square (RMS) error between the strain values from texture correlation and optical images varied from 6 to 10% for breast phantom compared to 2 to 7% for muscle tissue. As expected, the errors appeared to increase with larger deformation to suggest the limited scope of dependable estimates. The displacement estimates evaluated for square block sizes in muscle tissue, revealed acceptable RMS error range at 6 to 7 mm for tension and indentation test. The block sizes are significantly lower for homogeneous specimen due to better texture and dynamic range compared to muscle tissue. The indentation tests show the Bayesian texture correlation technique's ability to predict regions of non-homogenous deformation. Further studies must aim at analyzing image data with varying signal to noise ratios and identifying a measure of filter to remove questionable displacements. Advisors/Committee Members: Haridas, Balakrishna (Committee Chair), Yijun, Liu (Advisor).

Subjects/Keywords: Biomedical Research; Digital Image Correlation; Bayesian probability; ultrasound

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APA (6^th Edition):

Nageswaran, A. R. (2009). Deformation Analysis of Soft Tissues by Digital Image Correlation. (Masters Thesis). University of Cincinnati. Retrieved from http://rave.ohiolink.edu/etdc/view?acc_num=ucin1233614556

Chicago Manual of Style (16^th Edition):

Nageswaran, Ashok R. “Deformation Analysis of Soft Tissues by Digital Image Correlation.” 2009. Masters Thesis, University of Cincinnati. Accessed June 26, 2019. http://rave.ohiolink.edu/etdc/view?acc_num=ucin1233614556.

MLA Handbook (7^th Edition):

Nageswaran, Ashok R. “Deformation Analysis of Soft Tissues by Digital Image Correlation.” 2009. Web. 26 Jun 2019.

Vancouver:

Nageswaran AR. Deformation Analysis of Soft Tissues by Digital Image Correlation. [Internet] [Masters thesis]. University of Cincinnati; 2009. [cited 2019 Jun 26]. Available from: http://rave.ohiolink.edu/etdc/view?acc_num=ucin1233614556.

Council of Science Editors:

Nageswaran AR. Deformation Analysis of Soft Tissues by Digital Image Correlation. [Masters Thesis]. University of Cincinnati; 2009. Available from: http://rave.ohiolink.edu/etdc/view?acc_num=ucin1233614556

NSYSU

11. 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

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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 June 26, 2019. 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. 26 Jun 2019.

Vancouver:

Chu Y. DIC on the Thermal Expansion Coefficient Measurements of Palladium at Different Temperature Levels. [Internet] [Thesis]. NSYSU; 2014. [cited 2019 Jun 26]. 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

12. 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

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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 June 26, 2019. 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. 26 Jun 2019.

Vancouver:

Gan J. Measurement of the Residual Stress in Cr-Film by Using DIC. [Internet] [Thesis]. NSYSU; 2015. [cited 2019 Jun 26]. 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

Queens University

13. Dutton, Michael. Digital Image Correlation for Evaluating Structural Engineering Materials .

Degree: Civil Engineering, 2012, Queens University

URL: http://hdl.handle.net/1974/7552

► In the structural engineering community, a need exists for a non-contact two-dimensional measurement system which could provide information for field monitoring and greatly enhance the… (more)

▼ In the structural engineering community, a need exists for a non-contact two-dimensional measurement system which could provide information for field monitoring and greatly enhance the accuracy of numerical structural models. Recent advances have enabled the use of digital image correlation (DIC) to calculate the surface displacements of chosen targets in a series of digital images with a high degree of accuracy. Images are recorded during an experiment and are afterwards post-processed to find relevant information including, but not limited to, a) global displacement, b) relative displacement and c) changes in strain. In this research, a series of experiments were conducted to create measurement techniques for monitoring steel and reinforced concrete (RC) structures utilizing DIC. However, to ensure accurate DIC measurements, the addition of artificial texture from lightly applied spray paint on finished concrete was investigated and was determined to noticeably improve results. Furthermore, the placement of the digital camera relative to the structure being monitored was shown to control not only the desired field of view in the region of interest, but also the resulting image texture and DIC measurement accuracy. The DIC technique was applied to monitor and understand two important aspects of structural evaluation: a) the movement along shear planes and b) the evaluation of changes in strain due to curvature in beam elements. To monitor the change in crack width and slip, a method was created and validated on a series of artificial and reinforced concrete images for the cases of pure shear, pure flexure and combine flexure and shear. Curvature was found to impact the crack slip measurement, but its effect can be removed by using an innovative averaging technique. The curvature of a steel HSS and RC beams was found by using virtual DIC strain gauges and the horizontal strain profile. Results matched well with the curvature from electrical foil gauges and numerical models when the gauge length was maximized and selected so that the effects of cracking were accounted for.

Subjects/Keywords: engineering; concrete; digital image correlation; monitoring; structural; steel

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APA (6^th Edition):

Dutton, M. (2012). Digital Image Correlation for Evaluating Structural Engineering Materials . (Thesis). Queens University. Retrieved from http://hdl.handle.net/1974/7552

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):

Dutton, Michael. “Digital Image Correlation for Evaluating Structural Engineering Materials .” 2012. Thesis, Queens University. Accessed June 26, 2019. http://hdl.handle.net/1974/7552.

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

MLA Handbook (7^th Edition):

Dutton, Michael. “Digital Image Correlation for Evaluating Structural Engineering Materials .” 2012. Web. 26 Jun 2019.

Vancouver:

Dutton M. Digital Image Correlation for Evaluating Structural Engineering Materials . [Internet] [Thesis]. Queens University; 2012. [cited 2019 Jun 26]. Available from: http://hdl.handle.net/1974/7552.

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

Council of Science Editors:

Dutton M. Digital Image Correlation for Evaluating Structural Engineering Materials . [Thesis]. Queens University; 2012. Available from: http://hdl.handle.net/1974/7552

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

Queens University

14. Kemp, Scott Connor. Evaluating the Accuracy of Finite Element Models at Reduced Length Scales .

Degree: Mechanical and Materials Engineering, 2013, Queens University

URL: http://hdl.handle.net/1974/8363

► Finite element models are used frequently in both engineering and scientific research. While they can provide useful information as to the performance of materials, as… (more)

▼ Finite element models are used frequently in both engineering and scientific research. While they can provide useful information as to the performance of materials, as length scales are decreased more sophisticated model descriptions are required. It is also important to develop methods by which existing models may be verified against experimental findings. The present study evaluates the ability of various finite element models to predict materials behaviour at length scales ranging from several microns to tens of nanometers. Considering this motivation, this thesis is provided in manuscript form with the bulk of material coming from two case studies. Following an overview of relevant literature in Chapter 2, Chapter 3 considers the nucleation of delta-zirconium hydrides in a Zircaloy-2 matrix. Zirconium hydrides are an important topic in the nuclear industry as they form a brittle phase which leads to delayed hydride cracking during reactor start-up and shut-down. Several FE models are used to compare present results with literature findings and illustrate the weaknesses of standard FE approaches. It is shown that standard continuum techniques do not sufficiently capture the interfacial effects of an inclusion-matrix system. By using nano-scale material descriptions, nucleation lattice strains are obtained which are in good agreement with previous experimental studies. The motivation for Chapter 4 stems from a recognized need to develop a method for modeling corrosion behaviour of materials. Corrosion is also an issue for reactor design and an ability to predict failure points is needed. Finite element models could be used for this purpose, provided model accuracy is verified first. In Chapter 4 a technique is developed which facilitates the extraction of sub-micron resolution strain data from correlation images obtained during in-situ tensile deformation. By comparing image correlation results with a crystal plasticity finite element code it is found that good agreement between the two exists. The method outlined is material independent and could be applied to most metallurgical studies. Chapter 5 reviews the findings of each case study and makes suggestions as to the direction of future research.

Subjects/Keywords: Materials Science; Digital Image Correlation; Nano-Scale Inclusions; FE modeling

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APA (6^th Edition):

Kemp, S. C. (2013). Evaluating the Accuracy of Finite Element Models at Reduced Length Scales . (Thesis). Queens University. Retrieved from http://hdl.handle.net/1974/8363

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):

Kemp, Scott Connor. “Evaluating the Accuracy of Finite Element Models at Reduced Length Scales .” 2013. Thesis, Queens University. Accessed June 26, 2019. http://hdl.handle.net/1974/8363.

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

MLA Handbook (7^th Edition):

Kemp, Scott Connor. “Evaluating the Accuracy of Finite Element Models at Reduced Length Scales .” 2013. Web. 26 Jun 2019.

Vancouver:

Kemp SC. Evaluating the Accuracy of Finite Element Models at Reduced Length Scales . [Internet] [Thesis]. Queens University; 2013. [cited 2019 Jun 26]. Available from: http://hdl.handle.net/1974/8363.

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

Council of Science Editors:

Kemp SC. Evaluating the Accuracy of Finite Element Models at Reduced Length Scales . [Thesis]. Queens University; 2013. Available from: http://hdl.handle.net/1974/8363

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

Queens University

15. Hoag, Adam J. Monitoring of Dynamic Bridge Behaviour Using Digital Image Correlation .

Degree: Civil Engineering, 2016, Queens University

URL: http://hdl.handle.net/1974/14695

► Bridges are a critical part of North America’s transportation network that need to be assessed frequently to inform bridge management decision making. Visual inspections are… (more)

▼ Bridges are a critical part of North America’s transportation network that need to be assessed frequently to inform bridge management decision making. Visual inspections are usually implemented for this purpose, during which inspectors must observe and report any excess displacements or vibrations. Unfortunately, these visual inspections are subjective and often highly variable and so a monitoring technology that can provide quantitative measurements to supplement inspections is needed. Digital Image Correlation (DIC) is a novel monitoring technology that uses digital images to measure displacement fields without any contact with the bridge. In this research, DIC and accelerometers were used to investigate the dynamic response of a railway bridge reported to experience large lateral displacements. Displacements were estimated using accelerometer measurements and were compared to DIC measurements. It was shown that accelerometers can provide reasonable estimates of displacement for zero-mean lateral displacements. By comparing measurements in the girder and in the piers, it was shown that for the bridge monitored, the large lateral displacements originated in the steel casting bearings positioned above the piers, and not in the piers themselves. The use of DIC for evaluating the effectiveness of rehabilitation of the LaSalle Causeway lift bridge in Kingston, Ontario was also investigated. Vertical displacements were measured at midspan and at the lifting end of the bridge during a static test and under dynamic live loading. The bridge displacements were well within the operating limits, however a gap at the lifting end of the bridge was identified. Rehabilitation of the bridge was conducted and by comparing measurements before and after rehabilitation, it was shown that the gap was successfully closed. Finally, DIC was used to monitor the midspan vertical and lateral displacements in a monitoring campaign of five steel rail bridges. DIC was also used to evaluate the effectiveness of structural rehabilitation of the lateral bracing of a bridge. Simple finite element models are developed using DIC measurements of displacement. Several lessons learned throughout this monitoring campaign are discussed in the hope of aiding future researchers.

Subjects/Keywords: Civil Engineering; Digital Image Correlation; Dynamic; Displacement; Bridge Monioring

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APA (6^th Edition):

Hoag, A. J. (2016). Monitoring of Dynamic Bridge Behaviour Using Digital Image Correlation . (Thesis). Queens University. Retrieved from http://hdl.handle.net/1974/14695

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):

Hoag, Adam J. “Monitoring of Dynamic Bridge Behaviour Using Digital Image Correlation .” 2016. Thesis, Queens University. Accessed June 26, 2019. http://hdl.handle.net/1974/14695.

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

MLA Handbook (7^th Edition):

Hoag, Adam J. “Monitoring of Dynamic Bridge Behaviour Using Digital Image Correlation .” 2016. Web. 26 Jun 2019.

Vancouver:

Hoag AJ. Monitoring of Dynamic Bridge Behaviour Using Digital Image Correlation . [Internet] [Thesis]. Queens University; 2016. [cited 2019 Jun 26]. Available from: http://hdl.handle.net/1974/14695.

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

Council of Science Editors:

Hoag AJ. Monitoring of Dynamic Bridge Behaviour Using Digital Image Correlation . [Thesis]. Queens University; 2016. Available from: http://hdl.handle.net/1974/14695

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

University of Plymouth

16. Lu, Yanwei. Full-field modelling of crack tip shielding phenomena.

Degree: PhD, 2011, University of Plymouth

URL: http://hdl.handle.net/10026.1/885

► The application of fracture mechanics to engineering design has provided significant advances in understanding of the causes and mechanisms of failure and crack growth. Despite… (more)

Subjects/Keywords: 620.110287; Fatigue Crack, Crack Closure, Crack Shielding, Digital Image Correlation, Photoelasticity

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APA (6^th Edition):

Lu, Y. (2011). Full-field modelling of crack tip shielding phenomena. (Doctoral Dissertation). University of Plymouth. Retrieved from http://hdl.handle.net/10026.1/885

Chicago Manual of Style (16^th Edition):

Lu, Yanwei. “Full-field modelling of crack tip shielding phenomena.” 2011. Doctoral Dissertation, University of Plymouth. Accessed June 26, 2019. http://hdl.handle.net/10026.1/885.

MLA Handbook (7^th Edition):

Lu, Yanwei. “Full-field modelling of crack tip shielding phenomena.” 2011. Web. 26 Jun 2019.

Vancouver:

Lu Y. Full-field modelling of crack tip shielding phenomena. [Internet] [Doctoral dissertation]. University of Plymouth; 2011. [cited 2019 Jun 26]. Available from: http://hdl.handle.net/10026.1/885.

Council of Science Editors:

Lu Y. Full-field modelling of crack tip shielding phenomena. [Doctoral Dissertation]. University of Plymouth; 2011. Available from: http://hdl.handle.net/10026.1/885

University of Dayton

17. Hauber, Brett Kenneth. Fatigue Crack Propagation in Functionally Graded Materials.

Degree: PhD, Engineering, 2009, University of Dayton

URL: http://rave.ohiolink.edu/etdc/view?acc_num=dayton1259881312

► Interest in the development and application of functionally graded materials (FGM) has increased in recent years, leading to their limited use in a number… (more)

▼ Interest in the development and application of functionally graded materials (FGM) has increased in recent years, leading to their limited use in a number of commercial and military products. More recently, interest in the use of FGMs in aircraft fuselage structures as integrated thermal protection systems has also begun to develop. However, our limited ability to predict the nucleation and fatigue propagation of cracks in these materials limits the application of FGMs to non fracture critical structures, reducing the potential benefits of their incorporation. A first step toward addressing this technology gap is to evaluate whether linear elastic fracture mechanics methods, appropriately modified to account for material non homogeneity, can be used to predict fatigue crack propagation in an arbitrarily graded metal/ceramic FGM. This dissertation documents new developments for characterization and modeling of fatigue crack propagation in FGMs. Unique precracking and characterization methods, and a Paris equation dependent upon stress intensity and material phase volume fraction and gradients are developed for FGMs. Hybrid numerical experiments are used to develop and verify a multivariable regression (MVR) method for identifying the effective crack tip coordinates and accurately recovering stress intensity from 2-D crack tip displacement field measurements in FGMs. Numerical and experimental results for Ti-TiB FGM specimens validate the MVR method for recovery of stress intensity in FGMs when allowing for the presence of manufacturing-induced residual stresses. Predicted fatigue crack propagation rates also compare favorably with experimental results, but are limited in accuracy by the effects of residual stresses. Residual stresses modify crack tip stress intensities and their effects are only accountable here by using the MVR recovered stress intensities. The results suggest that a Paris equation including material gradients as independent variables is viable. However, an accurate means of accounting for residual stresses in arbitrary FGM forms must be developed if linear elastic fracture mechanics methods are to be used effectively, otherwise excessive experimental characterization of fatigue crack propagation properties would be required. Advisors/Committee Members: Brockman, Robert A (Advisor).

Subjects/Keywords: Mechanical Engineering; Functionally Graded materials; Fracture; Fatigue; Digital Image Correlation

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APA (6^th Edition):

Hauber, B. K. (2009). Fatigue Crack Propagation in Functionally Graded Materials. (Doctoral Dissertation). University of Dayton. Retrieved from http://rave.ohiolink.edu/etdc/view?acc_num=dayton1259881312

Chicago Manual of Style (16^th Edition):

Hauber, Brett Kenneth. “Fatigue Crack Propagation in Functionally Graded Materials.” 2009. Doctoral Dissertation, University of Dayton. Accessed June 26, 2019. http://rave.ohiolink.edu/etdc/view?acc_num=dayton1259881312.

MLA Handbook (7^th Edition):

Hauber, Brett Kenneth. “Fatigue Crack Propagation in Functionally Graded Materials.” 2009. Web. 26 Jun 2019.

Vancouver:

Hauber BK. Fatigue Crack Propagation in Functionally Graded Materials. [Internet] [Doctoral dissertation]. University of Dayton; 2009. [cited 2019 Jun 26]. Available from: http://rave.ohiolink.edu/etdc/view?acc_num=dayton1259881312.

Council of Science Editors:

Hauber BK. Fatigue Crack Propagation in Functionally Graded Materials. [Doctoral Dissertation]. University of Dayton; 2009. Available from: http://rave.ohiolink.edu/etdc/view?acc_num=dayton1259881312

Penn State University

18. Lanba, Asheesh. Niti-based Shape Memory Alloys: Relating Physical Deformation Mechanisms and the Wide Hysteresis.

Degree: PhD, Engineering Science and Mechanics, 2015, Penn State University

URL: https://etda.libraries.psu.edu/catalog/26514

► This work aims to experimentally establish processing-structure-property relationships in wide-hysteresis NiTiNb shape memory alloys. Manufactures supplied custom composition cast materials and off-the-shelf deformation processed (i.e.… (more)

▼ This work aims to experimentally establish processing-structure-property relationships in wide-hysteresis NiTiNb shape memory alloys. Manufactures supplied custom composition cast materials and off-the-shelf deformation processed (i.e. small diameter rods and thin sheets) NiTiNb alloys, and thus different extents of processing are studied. Microstructure characterization of these materials highlights the impact of processing on micro-constituent morphology. Thermo-mechanical experiments are conducted in order to contrast the mechanical and shape memory properties. Micro-deformation measurements are employed to visualize strain localization associated with the differently processed microstructures. Mechanistic and phenomenological rationale are developed that correlate the micro-constituent morphology and its interaction with the underlying martensitic phase transformation to the mechanical and shape memory behavior. The cast and deformation-processed NiTiNb microstructures are characterized via electron and acoustic microscopy. The microstructures are also altered via annealing. The cast microstructure reveals that the addition of Nb as a ternary element in NiTi results in a microstructure with β particles which are primarily Nb in a eutectic mixture with the α NiTi(Nb) phase. The eutectic mixture is cellular-like with areas of α NiTi(Nb) matrix material in between. The martensitic transformation, which is a reversible diffusionless crystallographic phase change that can be thermally- or stress-induced between a high temperature austenitic phase and low temperature martensitic phase, only takes place in this matrix. Two different deformation-processed alloys are studied; a rolled sheet and an extruded rod. Deformation-processing breaks up the eutectic structure resulting in a composite microstructure with discontinuous aligned second phase Nb-rich β-particle reinforcements. Annealing causes the Nb-rich particles to grow, and also increases the inter-particle spacing in both cast and deformation processed alloys. The shape memory behavior, characterized via thermal cycling with and without an external stress, and the mechanical properties, characterized from isothermal deformation to failure at different temperatures, are contrasted for cast and deformation-processed microstructures. The stress-free thermal cycling allows us to establish the characteristic transformation temperatures along with the elastic and irreversible energies associated with the transformation. Thermal cycling under load is used to characterize the transformation temperatures, thermal hysteresis, and the recoverable and permanent deformations. The isothermal deformation is used to contrast the stress-induced transformation and subsequent plastic deformation using the critical transformation stress and strain, elastic moduli, yield stress, and strain at failure. The work finds the experimental evidence correlating strain energy relaxation and widening of hysteresis and reverse transformation temperature interval. This comparative study between…

Subjects/Keywords: Shape Memory Alloys; Martensitic Transformation; Hysteresis; Microstructure; Digital Image Correlation; NiTiNb

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APA (6^th Edition):

Lanba, A. (2015). Niti-based Shape Memory Alloys: Relating Physical Deformation Mechanisms and the Wide Hysteresis. (Doctoral Dissertation). Penn State University. Retrieved from https://etda.libraries.psu.edu/catalog/26514

Chicago Manual of Style (16^th Edition):

Lanba, Asheesh. “Niti-based Shape Memory Alloys: Relating Physical Deformation Mechanisms and the Wide Hysteresis.” 2015. Doctoral Dissertation, Penn State University. Accessed June 26, 2019. https://etda.libraries.psu.edu/catalog/26514.

MLA Handbook (7^th Edition):

Lanba, Asheesh. “Niti-based Shape Memory Alloys: Relating Physical Deformation Mechanisms and the Wide Hysteresis.” 2015. Web. 26 Jun 2019.

Vancouver:

Lanba A. Niti-based Shape Memory Alloys: Relating Physical Deformation Mechanisms and the Wide Hysteresis. [Internet] [Doctoral dissertation]. Penn State University; 2015. [cited 2019 Jun 26]. Available from: https://etda.libraries.psu.edu/catalog/26514.

Council of Science Editors:

Lanba A. Niti-based Shape Memory Alloys: Relating Physical Deformation Mechanisms and the Wide Hysteresis. [Doctoral Dissertation]. Penn State University; 2015. Available from: https://etda.libraries.psu.edu/catalog/26514

Penn State University

19. Lanning, Wade Richard. Effects of Residual Stress and Electrode Array Structure on Electromechanical Damage Response of Multilayer Ceramic Capacitors.

Degree: MS, Materials Science and Engineering, 2011, Penn State University

URL: https://etda.libraries.psu.edu/catalog/13897

► Multilayer ceramic capacitors (MLCCs) are a common component in both reflow and wave-soldered circuits. Mechanical damage, particularly in the form of cracking, is a serious… (more)

▼ Multilayer ceramic capacitors (MLCCs) are a common component in both reflow and wave-soldered circuits. Mechanical damage, particularly in the form of cracking, is a serious problem which limits MLCC lifetime and performance. The effects on electrical behavior are especially pronounced in ferroelectric dielectrics like the barium titanate used in this thesis. This damage can be a result of thermal shock during soldering, joining stresses due to contraction of cooling solder, or board bending. Previous work has been done to model the residual and applied stresses that lead to mechanical failure, the effects of applied and residuals stresses on the electrical properties of the dielectric, and the mechanisms by which stress effects the ferroelectric properties of the dielectric. Residual stresses arise in MLCCs during processing when cooling after sintering, when the metal portions contract more than the ceramic dielectric. MLCCs with larger numbers of electrodes have greater residual stresses. This thesis explores the influence of residual stresses on the mechanical and electrical response of MLCCs to damage. It also uses a combination of in-situ spatial strain maps created using digital image correlation and tracking (DICT), electrical measurements, and knowledge about the response of ferroelectric dielectric materials to stress to make inferences about both the applied and residual stress states. Ultimately, this thesis demonstrates that the residual stress state of MLCCs dominates the electromechanical damage response of MLCCs and the electromechanical response can be used to probe the residual stress state of an MLCC. The tools used in this thesis and the information gained with them may be useful in the future for designing damage-resistant MLCCs. The MLCCs measured in this study showed typical decreasing capacitance and increasing dissipation with increasing AC frequency used in the measurement. When indented with a knoop tip to produce surface damage, the surface crack length increased with indentation force P^(3/2) which is typical behavior for a brittle ceramic. The capacitance of 1000 pf X7R MLCCs with 3 electrodes decreased approximately 1.6% with the placement of a 4 kg indent and 47000 pF MLCCs with 19 electrodes showed a 0.8% decrease even though their electrodes were closer to the indented surface. This suggests that the greater number of electrodes in the 47000 pF MLCCs protected them to some degree from the effects of surface damage, possibly by means of having a greater compressive residual surface stress which would resist formation of mode I cracks. Two sets of 24 MLCCs of each capacitance were also broken in 4-point bending and a Weibull analysis was done using a least squares fit. The 47000 pF MLCCs had a higher characteristic strength of 236 MPa vs. the 1000 pF MLCCs' 190 MPa. Micrographs of the fracture surfaces of preliminary mechanical tests of 100000 pF and 220 pF MLCCs of the same form factor showed that fracture most likely initiated on the tensile surface of the bent beam. This suggests…

Subjects/Keywords: MLCC; capacitor; dielectric; ferroelectric; dissipation; DICT; digital image correlation and tracking

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APA (6^th Edition):

Lanning, W. R. (2011). Effects of Residual Stress and Electrode Array Structure on Electromechanical Damage Response of Multilayer Ceramic Capacitors. (Masters Thesis). Penn State University. Retrieved from https://etda.libraries.psu.edu/catalog/13897

Chicago Manual of Style (16^th Edition):

Lanning, Wade Richard. “Effects of Residual Stress and Electrode Array Structure on Electromechanical Damage Response of Multilayer Ceramic Capacitors.” 2011. Masters Thesis, Penn State University. Accessed June 26, 2019. https://etda.libraries.psu.edu/catalog/13897.

MLA Handbook (7^th Edition):

Lanning, Wade Richard. “Effects of Residual Stress and Electrode Array Structure on Electromechanical Damage Response of Multilayer Ceramic Capacitors.” 2011. Web. 26 Jun 2019.

Vancouver:

Lanning WR. Effects of Residual Stress and Electrode Array Structure on Electromechanical Damage Response of Multilayer Ceramic Capacitors. [Internet] [Masters thesis]. Penn State University; 2011. [cited 2019 Jun 26]. Available from: https://etda.libraries.psu.edu/catalog/13897.

Council of Science Editors:

Lanning WR. Effects of Residual Stress and Electrode Array Structure on Electromechanical Damage Response of Multilayer Ceramic Capacitors. [Masters Thesis]. Penn State University; 2011. Available from: https://etda.libraries.psu.edu/catalog/13897

Penn State University

20. Collins, James Grayson. Failure prediction of composite bonded joints by analyzing strain homogeneity.

Degree: PhD, Materials Science and Engineering, 2011, Penn State University

URL: https://etda.libraries.psu.edu/catalog/12278

► Composite joints and structures are used xtensively in applications where a high strength to weight ratio is required, such as the frame in aircraft wings.… (more)

Subjects/Keywords: failure prediction; digital image correlation; bonded adhesive joints; strain development

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APA (6^th Edition):

Collins, J. G. (2011). Failure prediction of composite bonded joints by analyzing strain homogeneity. (Doctoral Dissertation). Penn State University. Retrieved from https://etda.libraries.psu.edu/catalog/12278

Chicago Manual of Style (16^th Edition):

Collins, James Grayson. “Failure prediction of composite bonded joints by analyzing strain homogeneity.” 2011. Doctoral Dissertation, Penn State University. Accessed June 26, 2019. https://etda.libraries.psu.edu/catalog/12278.

MLA Handbook (7^th Edition):

Collins, James Grayson. “Failure prediction of composite bonded joints by analyzing strain homogeneity.” 2011. Web. 26 Jun 2019.

Vancouver:

Collins JG. Failure prediction of composite bonded joints by analyzing strain homogeneity. [Internet] [Doctoral dissertation]. Penn State University; 2011. [cited 2019 Jun 26]. Available from: https://etda.libraries.psu.edu/catalog/12278.

Council of Science Editors:

Collins JG. Failure prediction of composite bonded joints by analyzing strain homogeneity. [Doctoral Dissertation]. Penn State University; 2011. Available from: https://etda.libraries.psu.edu/catalog/12278

University of Manchester

21. Jimenez Acosta, Carlos Efren. Assessment of weld residual stress effects on fatigue crack propagation in ferritic pressure vessel steels.

Degree: 2016, University of Manchester

URL: http://www.manchester.ac.uk/escholar/uk-ac-man-scw:300201

► This project aims to characterise the fatigue behaviour of a crack propagating in a residual stress field changing from tension to compression in the welded… (more)

▼ This project aims to characterise the fatigue behaviour of a crack propagating in a residual stress field changing from tension to compression in the welded zone of a ferritic pressure vessel steel. The fatigue tests were carried out keeping the applied stress intensity factor range constant to determine the role of residual stresses on fatigue crack growth. The residual stresses prior to crack growth were evaluated by X-ray diffraction. The weight function method was used to infer the expected influence of the residual stress on the crack tip in terms of the residual stress intensity factor.Two metrics were used to quantify the crack driving force local to the fatigue crack. Firstly the stress intensity amplitude expressed in terms of the change in the J-integral between maximum and minimum load and secondly the change in the crack opening displacement COD to estimate closure stress intensity factor. The displacement fields local to a fatigue crack were obtained by Digital Image Correlation (DIC) and then analysed by JMAN, an in-house developed algorithm to extract the J-integral based on finite element method and implemented using MATLAB. The difference between the applied stress intensity factor range and the effective crack driving force at the crack tip was determined in order to understand the interaction between the prior residual stresses and crack closure phenomena. Three different R-ratios were evaluated during the experiment (R=0.1, R=0.3 and R=0.5) in order to quantify the effect of residual stress on crack tip stress intensity and crack opening displacement. R-ratio plays a very important role on the fatigue crack growth rate (FCGR): as R increases, FCGR also increases. The COD was assessed by means of the displacements obtained by DIC local to the crack faces. The COD method turned out to be more insightful than the JMAN method for characterising the crack propagation, this is due to the presence of plasticity in the ligament which breaks the non-linear elastic conditions, causing the path-dependence on the J-integral.The FCGR is influenced to a greater degree by the R-ratio and to a lesser degree by the residual stress effect. There is a direct relationship between R and FCGR: as R increases, FCGR also increases, irrespective of the presence of tensile or compressive residual stresses, with the crack closure showing more tendency to occur at low R (i.e. R=0.1) than at high R (i.e. R=0.5). The relationship between R and the residual stress effects on FCGR is inversely proportional: as R increases, the effect of RS decreases. Advisors/Committee Members: SHERRY, ANDREW AH, Sherry, Andrew, Withers, Philip.

Subjects/Keywords: stress intensity factor range; Digital Image Correlation; JMAN; COD; residual stresses

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

APA (6^th Edition):

Jimenez Acosta, C. E. (2016). Assessment of weld residual stress effects on fatigue crack propagation in ferritic pressure vessel steels. (Doctoral Dissertation). University of Manchester. Retrieved from http://www.manchester.ac.uk/escholar/uk-ac-man-scw:300201

Chicago Manual of Style (16^th Edition):

Jimenez Acosta, Carlos Efren. “Assessment of weld residual stress effects on fatigue crack propagation in ferritic pressure vessel steels.” 2016. Doctoral Dissertation, University of Manchester. Accessed June 26, 2019. http://www.manchester.ac.uk/escholar/uk-ac-man-scw:300201.

MLA Handbook (7^th Edition):

Jimenez Acosta, Carlos Efren. “Assessment of weld residual stress effects on fatigue crack propagation in ferritic pressure vessel steels.” 2016. Web. 26 Jun 2019.

Vancouver:

Jimenez Acosta CE. Assessment of weld residual stress effects on fatigue crack propagation in ferritic pressure vessel steels. [Internet] [Doctoral dissertation]. University of Manchester; 2016. [cited 2019 Jun 26]. Available from: http://www.manchester.ac.uk/escholar/uk-ac-man-scw:300201.

Council of Science Editors:

Jimenez Acosta CE. Assessment of weld residual stress effects on fatigue crack propagation in ferritic pressure vessel steels. [Doctoral Dissertation]. University of Manchester; 2016. Available from: http://www.manchester.ac.uk/escholar/uk-ac-man-scw:300201

University of Cambridge

22. Edwards, Thomas Edward James. Plasticity of γ-TiAl alloys.

Degree: PhD, 2018, University of Cambridge

URL: https://www.repository.cam.ac.uk/handle/1810/275867 ; https://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.744840

► Gamma titanium aluminide alloys are emerging as a lightweight replacement to nickel superalloys, with current application in turbine stages of aero-engines, as well as in… (more)

▼ Gamma titanium aluminide alloys are emerging as a lightweight replacement to nickel superalloys, with current application in turbine stages of aero-engines, as well as in high performance automobiles and potentially the nuclear industry. The lack of toughness of its two constitutive intermetallic phases, γ-TiAl and α2-Ti3Al, prevents a conventional damage tolerant approach to fatigue lifing. To gain confidence in the use of γ-TiAl alloys and extend the temperature-stress envelope of applicability, the present work aims to achieve an understanding of the development of plasticity and flaw formation during cyclic loading. The general plasticity of a γ-TiAl alloy, Ti-45Al-2Nb-2Mn(at.%)-0.8vol.%TiB2, in compression was investigated by mapping the development of localised strain at the specimen surface. Methods were developed to produce speckle patterns for high resolution digital image correlation that were stable at test temperatures of 700 °C in air, in order to study the extent of plasticity generated by differing deformation mechanisms at application-relevant temperatures, with nano-scale resolution. At the colony scale (i.e. single stacks of co-planar α2-Ti3Al and γ-TiAl lamellae, where each stack is formed from a single high temperature disordered α-TiAl grain), macroscopic deformation bands were observed to develop at only a few percent strain. Within such bands, which propagated across many colonies of differing lamellar orientations, considerable lattice curvature and localised slip and twin operation occurred. This correlated with colony boundary failure in such bands. Twinning of the γ-TiAl phase parallel to the lamellar interfaces, longitudinal twinning, has rarely been studied, despite generalised twinning in equiaxed γ-TiAl grains being known to cause boundary decohesion. Here, the occurrence of longitudinal twinning in both microcompression and polycrystalline testpieces was investigated up to 700 °C by electron backscatter diffraction. The strength of constraint by surrounding lamellar domains was found to be the determining factor in the increased prominence of twinning at 700 °C, and hence determined whether twinning shear-induced flaws formed at colony boundaries. Using the high temperature digital image correlation strain mapping and electron backscatter diffraction techniques developed, along with transmission electron microscopy, the onset of plasticity at temperatures up to 700 °C was studied in both micro-scale and macro-scale test specimens for different lamellar thicknesses. Testpieces were loaded below the macroscopic yield stress in both monotonic and high cycle fatigue regimes, to 107 cycles, at a tensile stress ratio of R = 0.1. Longitudinal plasticity occurred in most colonies with soft mode lamellar orientations, and was located just 30 - 50 nm from lamellar interfaces. Lamellar refinement caused an increased number of slip bands to develop. In most cases, plastic strains decreased to zero by the colony boundary and strain transfer across such boundaries in high cycle fatigue was rare. At…

Subjects/Keywords: Titanium aluminide; Digital image correlation; Strain mapping; Twinning

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APA (6^th Edition):

Edwards, T. E. J. (2018). Plasticity of γ-TiAl alloys. (Doctoral Dissertation). University of Cambridge. Retrieved from https://www.repository.cam.ac.uk/handle/1810/275867 ; https://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.744840

Chicago Manual of Style (16^th Edition):

Edwards, Thomas Edward James. “Plasticity of γ-TiAl alloys.” 2018. Doctoral Dissertation, University of Cambridge. Accessed June 26, 2019. https://www.repository.cam.ac.uk/handle/1810/275867 ; https://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.744840.

MLA Handbook (7^th Edition):

Edwards, Thomas Edward James. “Plasticity of γ-TiAl alloys.” 2018. Web. 26 Jun 2019.

Vancouver:

Edwards TEJ. Plasticity of γ-TiAl alloys. [Internet] [Doctoral dissertation]. University of Cambridge; 2018. [cited 2019 Jun 26]. Available from: https://www.repository.cam.ac.uk/handle/1810/275867 ; https://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.744840.

Council of Science Editors:

Edwards TEJ. Plasticity of γ-TiAl alloys. [Doctoral Dissertation]. University of Cambridge; 2018. Available from: https://www.repository.cam.ac.uk/handle/1810/275867 ; https://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.744840

23. Mathieu, Florent. Analyse de la tenue mécanique d'un liner en titane : apport des mesures de champs cinématiques : A titanium liner mechanical analysis : contribution of field measurements.

Degree: Docteur es, Mécanique, génie mécanique, génie civil, 2013, Cachan, Ecole normale supérieure

URL: http://www.theses.fr/2013DENS0007

►

Les techniques de mesure de champs, et en particulier celles basées sur la Corrélation d’Images Numériques (CIN), sont matures et reconnues pour la détermination de… (more)

▼

Les techniques de mesure de champs, et en particulier celles basées sur la Corrélation d’Images Numériques (CIN), sont matures et reconnues pour la détermination de déplacements d’objets quelconques, en deux ou trois dimensions. Ces travaux ont pour objet le développement d’essais et de techniques d’identification associées, en s’appuyant sur les méthodes de mesure par CIN, pour permettre l’évaluation des caractéristiques mécaniques d’un liner en titane T35, développé pour des applications spatiales. Des essais de traction uniaxiale sont tout d'abord utilisés pour déterminer le comportement élastoplastique du T35. Plusieurs méthodes d'identification sont comparées. En particulier, il est proposé d'étendre la corrélation d'image dite "intégrée" aux cas élastoplatiques. Cette méthode permet d'évaluer à la fois les déplacements du solide observé et les paramètres mécaniques des matériaux le constituant. Elle est comparée à une méthode de recalage de référence. L'étude se porte ensuite sur l'analyse de l'amorçage des fissures dans le liner. Les chargements cycliques du réservoir imposent à la tôle une déformation biaxiale cyclique en traction-compression de quelques pourcents, qui a été reproduite expérimentalement dans une machine multiaxiale. Cette partie a notamment nécessité le développement d’un essai triaxial à rapport de charge négatif sur tôle mince. Une estimation de la limite d'amorçage a été obtenue pour les niveaux de déformation visés. Enfin, la fissuration du liner a été étudiée par des techniques d'analyse dédiées. Certaines de ces techniques sont comparées quantitativement, afin d'étudier leurs capacités et limitations respectives. Des lois de propagation de type Paris ont été identifiées directement à partir d'images du voisinage de la fissure.

Field measurement techniques, and more particularly those based on Digital Image Correlation (DIC), are mature techniques for the determination of displacements of two or three-dimensional objects. The goal of this work is to develop test and associated identification DIC-based techniques to identify the mechanical behavior of a commercially-pure titanium liner, conceived for spatial applications. Uniaxial tensile teste are first used to identify the elasto-plastic behavior of this material. Several identification methods are compared. It is especially proposed to extend said "integrated" Digital Image Correlation to elasto-plastic cases. This methods allows to identify directly the displacement of the observed solid and the mechanical parameters of the constituting material. It is compared to a reference updating method. The crack initiation is then studied in this material. Some zones of the liner will be submitted to a plastic cyclic deformation, that has to be reproduced experimentally. A dedicated test has been conceived, allowing to apply a negative load ratio to the thin sheet. An estimation of the initiation limit has been obtained for this material. Finally, the crack propagation in the liner has been studied, using dedicated techniques. Some of these…

Advisors/Committee Members: Hild, François (thesis director).

Subjects/Keywords: Corrélation d'images numériques; Fissuration; Identification; Digital image correlation; Crack propagation; Identification

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APA (6^th Edition):

Mathieu, F. (2013). Analyse de la tenue mécanique d'un liner en titane : apport des mesures de champs cinématiques : A titanium liner mechanical analysis : contribution of field measurements. (Doctoral Dissertation). Cachan, Ecole normale supérieure. Retrieved from http://www.theses.fr/2013DENS0007

Chicago Manual of Style (16^th Edition):

Mathieu, Florent. “Analyse de la tenue mécanique d'un liner en titane : apport des mesures de champs cinématiques : A titanium liner mechanical analysis : contribution of field measurements.” 2013. Doctoral Dissertation, Cachan, Ecole normale supérieure. Accessed June 26, 2019. http://www.theses.fr/2013DENS0007.

MLA Handbook (7^th Edition):

Mathieu, Florent. “Analyse de la tenue mécanique d'un liner en titane : apport des mesures de champs cinématiques : A titanium liner mechanical analysis : contribution of field measurements.” 2013. Web. 26 Jun 2019.

Vancouver:

Mathieu F. Analyse de la tenue mécanique d'un liner en titane : apport des mesures de champs cinématiques : A titanium liner mechanical analysis : contribution of field measurements. [Internet] [Doctoral dissertation]. Cachan, Ecole normale supérieure; 2013. [cited 2019 Jun 26]. Available from: http://www.theses.fr/2013DENS0007.

Council of Science Editors:

Mathieu F. Analyse de la tenue mécanique d'un liner en titane : apport des mesures de champs cinématiques : A titanium liner mechanical analysis : contribution of field measurements. [Doctoral Dissertation]. Cachan, Ecole normale supérieure; 2013. Available from: http://www.theses.fr/2013DENS0007

24. Cui, Jianqing. Influence of subset size, shape and orientation on texture based digital image correlation.

Degree: MS, Mechanical Engineering, 2014, Oregon State University

URL: http://hdl.handle.net/1957/54904

► Digital Image Correlation(DIC) is one of full-field strain measurement techniques devel- oped in recent decades, which has been well-demonstrated to conduct the mechanical properties study… (more)

▼ Digital Image Correlation(DIC) is one of full-field strain measurement techniques devel- oped in recent decades, which has been well-demonstrated to conduct the mechanical properties study of solid materials, by collecting data using digital cameras. X-ray to- mography(CT) imaging helps the correlation techniques expanded to three dimensional investigation of materials, known as Digital Volume Correlation(DVC). Adopting ideas from DIC, DVC is based on tracking the deformation of the material features within image volumes, by optimizing an objective function used to compare small subsets of image data from sequences of sample CT scan. However, speckling techniques generally used in DIC to create a distinguishable pattern for correlation are not applicable within an image volume of a material, so the natural texture of the materials becomes the correlation method relied on. Depending on the natural context, the DVC method cannot be adjusted in the sample images as DIC tuning speckle patterns, that natural texture does not always meet the requirements of digital correlation. This implies that we have to adjust the DVC to fit the images[1], which leads the correlation algorithm encountering some challenges when the texture appears in oriented patterns. In this thesis, a new approach is discussed to resolve the challenges by changing the subset both in target and reference images to impact the performance of the DVC and the optimization method applied, which refers to the feature of the sample texture. In order to show the influence of subset on the performance of DVC based on natural texture, these strategies of subset changes are used to generate the correlation result in the Region of Interest(ROI) with representative texture features in sample images. Different ROIs from two CT image volumes have been tested using an open source implement, which applies the objective function globally in the correlation region. By analyzing the results, a general relationship between subset adjusting and improvement of DVC performance on texture based samples is concluded. That is, a better performance of DVC can be achieved by adjusting subset to a shape similar with the feature of the natural texture in ROI. Advisors/Committee Members: Bay, Brain K. (advisor), Warnes, William H. (committee member).

Subjects/Keywords: Digital image correlation

…2.1.3 Image Correlation and Digital Volume Correlation Techniques used in Digital Image… …2.1 Example of Digital Image Correlation with measurement points . . . . . . 5 2.2… …75 Chapter 1: Abstract Digital Image Correlation(DIC) is one of full-field… …Digital Image and Volume Correlation. Digital Image Correlation(DIC) has been well… …material characteristics, the extension of Digital Image Correlation in three dimensional known…

10 more images…

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APA (6^th Edition):

Cui, J. (2014). Influence of subset size, shape and orientation on texture based digital image correlation. (Masters Thesis). Oregon State University. Retrieved from http://hdl.handle.net/1957/54904

Chicago Manual of Style (16^th Edition):

Cui, Jianqing. “Influence of subset size, shape and orientation on texture based digital image correlation.” 2014. Masters Thesis, Oregon State University. Accessed June 26, 2019. http://hdl.handle.net/1957/54904.

MLA Handbook (7^th Edition):

Cui, Jianqing. “Influence of subset size, shape and orientation on texture based digital image correlation.” 2014. Web. 26 Jun 2019.

Vancouver:

Cui J. Influence of subset size, shape and orientation on texture based digital image correlation. [Internet] [Masters thesis]. Oregon State University; 2014. [cited 2019 Jun 26]. Available from: http://hdl.handle.net/1957/54904.

Council of Science Editors:

Cui J. Influence of subset size, shape and orientation on texture based digital image correlation. [Masters Thesis]. Oregon State University; 2014. Available from: http://hdl.handle.net/1957/54904

University of Adelaide

25. Khatami, Hamidreza. A study of arching effect in soils incorporating receycled tyres.

Degree: 2018, University of Adelaide

URL: http://hdl.handle.net/2440/118117

► The term ‘arching effect’ refers to the phenomenon of stress redistribution in granular materials because of induced differential displacements and/or significant stiffness difference between the… (more)

▼ The term ‘arching effect’ refers to the phenomenon of stress redistribution in granular materials because of induced differential displacements and/or significant stiffness difference between the substituted and original materials. Arching is frequently observed in different geotechnical practice such as piled and geogrid-reinforced embankments, foundation piles, retaining walls, backfills, tunnelling, buried pipes, and excavation. Knowledge of arching mechanism serves to assist engineers in optimising their soil-structure design. Investigation of mechanical properties and potential applications of recycled-tyre-based aggregates has been carried out extensively over the last 25 years firstly to exploit the beneficial engineering properties of waste tyres such as their light weight as backfilling material and secondly to mitigate their environmental impact. However, to the author’s knowledge, no previous study of the arching effect in rubber-soil mixtures have been reported in literature at the time of this research. As rubberised soil is gradually establishing its place as a suitable and cost-effective alternative to natural aggregate in geotechnical work, it is worthwhile to have a thorough knowledge of the arching effect in rubber-soil mixtures. This thesis aims at experimentally investigating the arching effect in a coarse sand and rubber-soil mixtures using the Digital Image Correlation (DIC) technique and stress measurements. Active and passive arching modes in soil and rubberised soil were studied and compared. To do so, a replicate of Terzaghi’s original trapdoor apparatus was manufactured and filled with dyed sand and 10% and 30% (by weight) rubberised sand. Imaging and DIC analysis of the arching effect induced deformation in the trapdoor apparatus for the aforementioned granular material were conducted using VicSnap and VIC-2D computer programs. The distribution regimes of vertical and horizontal displacements and strains in the specimen cross-sectional area were obtained and interpreted. Additionally, shear strains, major and minor principal strains, and volumetric strains were computed and analysed. The effect of a central 5 kPa surcharge on these variables was also studied. It was observed that the DIC technique provides small-scale information and insights into how and where the arching effect creates zones of different local deformations within soil. The patterns and values of these deformation fields were found to be dependent on the test conditions and material type. As part of the experimental plan, the evolution of stresses over the trapdoor element and its adjacent, static bases, was recorded during the experiments using a number of stress sensors. Advisors/Committee Members: Deng, An (advisor), Jaksa, Mark (advisor), School of Civil, Environmental and Mining Engineering (school).

Subjects/Keywords: Arching effect; rubber-sand; digital image correlation; stress; deformation

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

APA (6^th Edition):

Khatami, H. (2018). A study of arching effect in soils incorporating receycled tyres. (Thesis). University of Adelaide. Retrieved from http://hdl.handle.net/2440/118117

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):

Khatami, Hamidreza. “A study of arching effect in soils incorporating receycled tyres.” 2018. Thesis, University of Adelaide. Accessed June 26, 2019. http://hdl.handle.net/2440/118117.

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

MLA Handbook (7^th Edition):

Khatami, Hamidreza. “A study of arching effect in soils incorporating receycled tyres.” 2018. Web. 26 Jun 2019.

Vancouver:

Khatami H. A study of arching effect in soils incorporating receycled tyres. [Internet] [Thesis]. University of Adelaide; 2018. [cited 2019 Jun 26]. Available from: http://hdl.handle.net/2440/118117.

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

Council of Science Editors:

Khatami H. A study of arching effect in soils incorporating receycled tyres. [Thesis]. University of Adelaide; 2018. Available from: http://hdl.handle.net/2440/118117

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

Cranfield University

26. Sergent, Nicolas. Analysis and optimisation of disc brake calipers.

Degree: PhD, 2010, Cranfield University

URL: http://dspace.lib.cranfield.ac.uk/handle/1826/10196

► Disc brake calipers are subjected to complex mechanical loading and interaction of individual components in a typical brake assembly makes design improvement very challenging. To… (more)

Subjects/Keywords: Finite Element Analysis; pressure distribution; digital image correlation; topology; optimisation

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APA (6^th Edition):

Sergent, N. (2010). Analysis and optimisation of disc brake calipers. (Doctoral Dissertation). Cranfield University. Retrieved from http://dspace.lib.cranfield.ac.uk/handle/1826/10196

Chicago Manual of Style (16^th Edition):

Sergent, Nicolas. “Analysis and optimisation of disc brake calipers.” 2010. Doctoral Dissertation, Cranfield University. Accessed June 26, 2019. http://dspace.lib.cranfield.ac.uk/handle/1826/10196.

MLA Handbook (7^th Edition):

Sergent, Nicolas. “Analysis and optimisation of disc brake calipers.” 2010. Web. 26 Jun 2019.

Vancouver:

Sergent N. Analysis and optimisation of disc brake calipers. [Internet] [Doctoral dissertation]. Cranfield University; 2010. [cited 2019 Jun 26]. Available from: http://dspace.lib.cranfield.ac.uk/handle/1826/10196.

Council of Science Editors:

Sergent N. Analysis and optimisation of disc brake calipers. [Doctoral Dissertation]. Cranfield University; 2010. Available from: http://dspace.lib.cranfield.ac.uk/handle/1826/10196

Virginia Tech

27. Dellinger, Sarah Bonham. Material properties of skin in a flying snake (Chrysopelea ornata).

Degree: MS, Engineering Mechanics, 2011, Virginia Tech

URL: http://hdl.handle.net/10919/42721

► The genus Chrysopelea encompasses the â flyingâ snakes. This taxon has the ability to glide via lateral aerial undulation and dorsoventral body flattening, a skill… (more)

Subjects/Keywords: skin; digital image correlation; material properties; flying snakes

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APA (6^th Edition):

Dellinger, S. B. (2011). Material properties of skin in a flying snake (Chrysopelea ornata). (Masters Thesis). Virginia Tech. Retrieved from http://hdl.handle.net/10919/42721

Chicago Manual of Style (16^th Edition):

Dellinger, Sarah Bonham. “Material properties of skin in a flying snake (Chrysopelea ornata).” 2011. Masters Thesis, Virginia Tech. Accessed June 26, 2019. http://hdl.handle.net/10919/42721.

MLA Handbook (7^th Edition):

Dellinger, Sarah Bonham. “Material properties of skin in a flying snake (Chrysopelea ornata).” 2011. Web. 26 Jun 2019.

Vancouver:

Dellinger SB. Material properties of skin in a flying snake (Chrysopelea ornata). [Internet] [Masters thesis]. Virginia Tech; 2011. [cited 2019 Jun 26]. Available from: http://hdl.handle.net/10919/42721.

Council of Science Editors:

Dellinger SB. Material properties of skin in a flying snake (Chrysopelea ornata). [Masters Thesis]. Virginia Tech; 2011. Available from: http://hdl.handle.net/10919/42721

Drexel University

28. Shannahan, Logan Spencer. A Hybrid Experimental-Computational Approach for the Analysis of Dynamic Fracture.

Degree: 2017, Drexel University

URL: http://hdl.handle.net/1860/idea:7566

►

The fracture behavior of materials resulting from rapidly applied loads remains poorly understood, and requires consideration of the inertial forces and rapidly changing crack front.… (more)

▼

The fracture behavior of materials resulting from rapidly applied loads remains poorly understood, and requires consideration of the inertial forces and rapidly changing crack front. At the same time, with the advent of improved high-speed cameras and full-field optical techniques such as digital image correlation (DIC), the spatial and temporal resolution of measurable field data has increased. As such, this thesis presents a novel hybrid experimental-computational technique that extracts dynamic fracture criterion from DIC data using improved, iterative elastodynamic expressions relating stress intensity factors (SIFs) to displacement fields around the crack front. Two variations of the solution are explored: an over-deterministic least squares regression is used when the crack tip location is known, such as at initiation of fracture, and an iterative Newton-Raphson optimization is used when the crack tip location is unknown. Dynamic fracture experiments are conducted on single-edge-notch specimens, impacted on the opposite face by a striker in mode I (or crack opening), to determine the efficacy of the method. Three materials with varying microstructures are studied: brittle polymer polymethyl methacrylate (PMMA), nanolayered metal-ceramic MAX phase Ti3SiC2, and human femoral cortical bone, a natural hierarchical ceramic matrix composite. PMMA is a historically well-studied material in classical dynamic fracture mechanics and is chosen as a model material, and when combined with data from literature is used to conduct validation and uncertainty quantification arising from key experimental and numerical parameters. Material rate dependency and the effect of transient wave interactions are investigated in the dynamic fracture behavior of MAX phase Ti3SiC2, and found to hold little influence due to the energy absorbing mechanisms of kink banding and delamination unique to the layered microstructure. Mode-mixity arising from an orthotropic microstructure is investigated in human femoral cortical bone, and lead to significant mode II SIFs even in the absence of any applied mode II loading, though mode I fracture remains dominant. These collective results demonstrate the wide variety of material microstructures with varying deformation mechanisms to which the hybrid experimental-computational dynamic fracture analysis is well-suited to handle.

Ph.D., Mechanical Engineering and Mechanics – Drexel University, 2017

Advisors/Committee Members: Lamberson, Leslie, Lau, Alan, College of Engineering.

Subjects/Keywords: Mechanical engineering; Digital image correlation; Fracture mechanics – Research; Fractures

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APA (6^th Edition):

Shannahan, L. S. (2017). A Hybrid Experimental-Computational Approach for the Analysis of Dynamic Fracture. (Thesis). Drexel University. Retrieved from http://hdl.handle.net/1860/idea:7566

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):

Shannahan, Logan Spencer. “A Hybrid Experimental-Computational Approach for the Analysis of Dynamic Fracture.” 2017. Thesis, Drexel University. Accessed June 26, 2019. http://hdl.handle.net/1860/idea:7566.

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

MLA Handbook (7^th Edition):

Shannahan, Logan Spencer. “A Hybrid Experimental-Computational Approach for the Analysis of Dynamic Fracture.” 2017. Web. 26 Jun 2019.

Vancouver:

Shannahan LS. A Hybrid Experimental-Computational Approach for the Analysis of Dynamic Fracture. [Internet] [Thesis]. Drexel University; 2017. [cited 2019 Jun 26]. Available from: http://hdl.handle.net/1860/idea:7566.

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

Council of Science Editors:

Shannahan LS. A Hybrid Experimental-Computational Approach for the Analysis of Dynamic Fracture. [Thesis]. Drexel University; 2017. Available from: http://hdl.handle.net/1860/idea:7566

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

Drexel University

29. Saralaya, Raghavendra Nataraj. In-situ Grain Scale Strain Measurements using Digital Image Correlation.

Degree: 2012, Drexel University

URL: http://hdl.handle.net/1860/4125

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Materials used in engineering structures fatigue and ultimately fail due to the various applied loads they are subject to, a process which compromises structural performance… (more)

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Materials used in engineering structures fatigue and ultimately fail due to the various applied loads they are subject to, a process which compromises structural performance and potentially poses threats to society. Commonly employed theoretical models capable of describing and predicting deformation and failure are typically validated by relevant experimental results obtained from laboratory testing. However, such models are also often based on simplifying assumptions including for example homogeneous composition and isotropic behavior, since available experimental information relates primarily to bulk behavior.Metals are crystalline in nature and their failure depends on several parameters that span a wide range of time and length scales. Therefore, significant efforts have been made over the past decades to investigate the mechanical behavior of polycrystalline metals by formulating important microstructure-properties relations. In this context, this thesis presents a framework to obtain reliable, non-destructive, non-contact, full field measurements of deformation and strain at the grain-scale of polycrystalline materials to assist the understanding of materials phenomena and contribute in the development of realistic mechanics models. To this aim, the method of Digital Image Correlation is used, adapted and expanded.Digital Image Correlation relies on images of the surface of tested specimens, components or structures and the identification of surface contrast patterns which are tracked as a function of deformation and are subsequently used to define displacements and strains. To quantify stains at the grain-scale, three different approaches based on Digital Image Correlation are described. The first involves the use of a commercial system adapted to make grain-scale measurements at the meso-scale (~4mm). A magnesium AZ31alloy was observed for this purpose and full field strain maps are reported. The second employs the same commercial system augmented with a long distance optical microscope to in-situ quantify strains at the tip of a propagating crack in a Compact Tension specimen of an Al2024 aluminum alloy subjected to Mode I loading and using a field of view of ~870 x 730 μm. Finally, the third approach uses an image series acquired from loading a stainless steel sample inside a scanning electron microscope equipped with a micro-tensile stage. Such information was post processed ex-situ and strains were obtained. The advantages and limitations of the proposed approaches are critically evaluated and future work is described to further enhance the reliability and repeatability of grain scale strain measurements using Digital Image Correlation.

M.S., Mechanical Engineering – Drexel University, 2012

Advisors/Committee Members: Kontsos, Antonios.

Subjects/Keywords: Mechanical engineering; Strains and stresses – Measurement; Digital image correlation

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

APA (6^th Edition):

Saralaya, R. N. (2012). In-situ Grain Scale Strain Measurements using Digital Image Correlation. (Thesis). Drexel University. Retrieved from http://hdl.handle.net/1860/4125

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):

Saralaya, Raghavendra Nataraj. “In-situ Grain Scale Strain Measurements using Digital Image Correlation.” 2012. Thesis, Drexel University. Accessed June 26, 2019. http://hdl.handle.net/1860/4125.

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

MLA Handbook (7^th Edition):

Saralaya, Raghavendra Nataraj. “In-situ Grain Scale Strain Measurements using Digital Image Correlation.” 2012. Web. 26 Jun 2019.

Vancouver:

Saralaya RN. In-situ Grain Scale Strain Measurements using Digital Image Correlation. [Internet] [Thesis]. Drexel University; 2012. [cited 2019 Jun 26]. Available from: http://hdl.handle.net/1860/4125.

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

Council of Science Editors:

Saralaya RN. In-situ Grain Scale Strain Measurements using Digital Image Correlation. [Thesis]. Drexel University; 2012. Available from: http://hdl.handle.net/1860/4125

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

Southern Illinois University

30. Mosayebi, Mahshad. Digital Laser Speckle Image Correlation.

Degree: MS, Mechanical Engineering, 2017, Southern Illinois University

URL: http://opensiuc.lib.siu.edu/theses/2131

► This thesis examines the feasibility of combining Digital Image Correlation (DIC) with laser speckle based methods to form a new hybrid deformation measurement method… (more)

Subjects/Keywords: Digital Image correlation; Laser; Non-destructive Testing; strain measurement

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

APA (6^th Edition):

Mosayebi, M. (2017). Digital Laser Speckle Image Correlation. (Masters Thesis). Southern Illinois University. Retrieved from http://opensiuc.lib.siu.edu/theses/2131

Chicago Manual of Style (16^th Edition):

Mosayebi, Mahshad. “Digital Laser Speckle Image Correlation.” 2017. Masters Thesis, Southern Illinois University. Accessed June 26, 2019. http://opensiuc.lib.siu.edu/theses/2131.

MLA Handbook (7^th Edition):

Mosayebi, Mahshad. “Digital Laser Speckle Image Correlation.” 2017. Web. 26 Jun 2019.

Vancouver:

Mosayebi M. Digital Laser Speckle Image Correlation. [Internet] [Masters thesis]. Southern Illinois University; 2017. [cited 2019 Jun 26]. Available from: http://opensiuc.lib.siu.edu/theses/2131.

Council of Science Editors:

Mosayebi M. Digital Laser Speckle Image Correlation. [Masters Thesis]. Southern Illinois University; 2017. Available from: http://opensiuc.lib.siu.edu/theses/2131

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