subject:(Shear Modulus)

University of Washington

1. Ogg, Anderson. Screening Tests of Composites for Use in Tidal Energy Devices.

Degree: 2011, University of Washington

► Four different composite material systems are subjected to nine months of in situ exposure at a potential tidal energy site. These four systems are fiberglass/epoxy,… (more)

Subjects/Keywords: tidal; energy; composites; shear; modulus

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APA (6^th Edition):

Ogg, A. (2011). Screening Tests of Composites for Use in Tidal Energy Devices. (Thesis). University of Washington. Retrieved from http://hdl.handle.net/1773/17061

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):

Ogg, Anderson. “Screening Tests of Composites for Use in Tidal Energy Devices.” 2011. Thesis, University of Washington. Accessed April 11, 2021. http://hdl.handle.net/1773/17061.

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

MLA Handbook (7^th Edition):

Ogg, Anderson. “Screening Tests of Composites for Use in Tidal Energy Devices.” 2011. Web. 11 Apr 2021.

Vancouver:

Ogg A. Screening Tests of Composites for Use in Tidal Energy Devices. [Internet] [Thesis]. University of Washington; 2011. [cited 2021 Apr 11]. Available from: http://hdl.handle.net/1773/17061.

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

Council of Science Editors:

Ogg A. Screening Tests of Composites for Use in Tidal Energy Devices. [Thesis]. University of Washington; 2011. Available from: http://hdl.handle.net/1773/17061

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

University of Utah

2. Litz, Darren James. Development of the combined loading shear test method and shear strain measurement in the v-notched rail shear test.

Degree: MS, Mechanical Engineering, 2012, University of Utah

URL: http://content.lib.utah.edu/cdm/singleitem/collection/etd3/id/1924/rec/720

► Unique constraints are present when shear properties of orthotropic materials are desired, as they typically cannot be derived from tensile material properties like isotropic materials.… (more)

▼ Unique constraints are present when shear properties of orthotropic materials are desired, as they typically cannot be derived from tensile material properties like isotropic materials. Specific test specimen geometry, and in some instances specimen layup, are required in order to obtain valid shear property data. The V-Notched Rail Shear Test Method is one such test method developed to provide reliable shear test data for compo-site laminates. However, specimens made from suitably high strength materials will slip prior to failure providing invalid results. Previous work has been performed which im-proves on this test method by altering the specimen dimensions and fixture design in or-der to prevent slipping. Changes made to the fixture introduced another load path into the specimen, which can influence the stress state within the specimen. The current work looks at several aspects of the new Combined Loading Shear test fixture and how they affect the stress and strain state, as well as the measured shear strength. Photoelastic test-ing is performed to validate numerical models and to investigate the strain state in several different specimen layups as a result of the fixture changes. Accurate shear strain measurement is required when determining the shear modu-lus of a material. Bonded strain gauges are often used when strain measurements are re-quired; however, extensometers can provide the same functionality as strain gauges and have the advantage of being reusable. Extensometers are typically application specific and require careful consideration with regards to attachment and the region where exten-sion is measured. The current study proposes a shear extensometer for a V-Notched Rail Shear or Combined Loading Shear test specimen. A mechanics of materials model is used to calculate the shear strain in the specimen based on the relative displacement of a discrete set of points on the specimen face. Numerical simulations were performed to determine the points on the specimen face which would yield the most accurate measure of the in-plane shear modulus. A prototype device is tested using carbon/epoxy, glass/epoxy, and Kevlar/epoxy cross-ply laminates and the data from the extensometer are compared to data from bonded strain gauges to validate the extensometer.

Subjects/Keywords: composites; extensometer; photoelasticity; shear modulus; shear strength; shear testing

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APA (6^th Edition):

Litz, D. J. (2012). Development of the combined loading shear test method and shear strain measurement in the v-notched rail shear test. (Masters Thesis). University of Utah. Retrieved from http://content.lib.utah.edu/cdm/singleitem/collection/etd3/id/1924/rec/720

Chicago Manual of Style (16^th Edition):

Litz, Darren James. “Development of the combined loading shear test method and shear strain measurement in the v-notched rail shear test.” 2012. Masters Thesis, University of Utah. Accessed April 11, 2021. http://content.lib.utah.edu/cdm/singleitem/collection/etd3/id/1924/rec/720.

MLA Handbook (7^th Edition):

Litz, Darren James. “Development of the combined loading shear test method and shear strain measurement in the v-notched rail shear test.” 2012. Web. 11 Apr 2021.

Vancouver:

Litz DJ. Development of the combined loading shear test method and shear strain measurement in the v-notched rail shear test. [Internet] [Masters thesis]. University of Utah; 2012. [cited 2021 Apr 11]. Available from: http://content.lib.utah.edu/cdm/singleitem/collection/etd3/id/1924/rec/720.

Council of Science Editors:

Litz DJ. Development of the combined loading shear test method and shear strain measurement in the v-notched rail shear test. [Masters Thesis]. University of Utah; 2012. Available from: http://content.lib.utah.edu/cdm/singleitem/collection/etd3/id/1924/rec/720

Addis Ababa University

3. ABU, GEMECHU. SHEAR MODULUS AND DAMPING RATIO VALUES OF SOILS FOUND IN ADAMA .

Degree: 2014, Addis Ababa University

URL: http://etd.aau.edu.et/dspace/handle/123456789/4304

► In this study an attempt was done to determine shear modulus and damping ratio of soils found in Adama city. The city is located in… (more)

Subjects/Keywords: SHEAR MODULUS; DAMPING RATIO; VALUES OF SOILS

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APA (6^th Edition):

ABU, G. (2014). SHEAR MODULUS AND DAMPING RATIO VALUES OF SOILS FOUND IN ADAMA . (Thesis). Addis Ababa University. Retrieved from http://etd.aau.edu.et/dspace/handle/123456789/4304

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):

ABU, GEMECHU. “SHEAR MODULUS AND DAMPING RATIO VALUES OF SOILS FOUND IN ADAMA .” 2014. Thesis, Addis Ababa University. Accessed April 11, 2021. http://etd.aau.edu.et/dspace/handle/123456789/4304.

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

MLA Handbook (7^th Edition):

ABU, GEMECHU. “SHEAR MODULUS AND DAMPING RATIO VALUES OF SOILS FOUND IN ADAMA .” 2014. Web. 11 Apr 2021.

Vancouver:

ABU G. SHEAR MODULUS AND DAMPING RATIO VALUES OF SOILS FOUND IN ADAMA . [Internet] [Thesis]. Addis Ababa University; 2014. [cited 2021 Apr 11]. Available from: http://etd.aau.edu.et/dspace/handle/123456789/4304.

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

Council of Science Editors:

ABU G. SHEAR MODULUS AND DAMPING RATIO VALUES OF SOILS FOUND IN ADAMA . [Thesis]. Addis Ababa University; 2014. Available from: http://etd.aau.edu.et/dspace/handle/123456789/4304

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

University of Alberta

4. Bakhorji, Aiman M. Laboratory measurements of static and dynamic elastic properties in carbonate.

Degree: PhD, Department of Physics, 2010, University of Alberta

URL: https://era.library.ualberta.ca/files/v118rf203

► The fact that many of the giant hydrocarbon reservoirs, such as the Ghawar field in Saudi Arabia and the Grosmont formation in Alberta, are formed… (more)

▼ The fact that many of the giant hydrocarbon reservoirs, such as the Ghawar field in Saudi Arabia and the Grosmont formation in Alberta, are formed from carbonates make these rocks important research topics. Compressional and shear wave velocities (at 1 MHz) and the quasi-static strains of thirty seven carbonate rock samples were measured as functions of saturating fluid and confining pressure. Furthermore, P- and S-wave velocities of the saturated samples were measured at constant differential pressure of 15 MPa. The quasi-static strains of the samples under jacketed and unjacketed conditions were also simultaneously acquired. The lithology, mineralogy, porosity and pore type and size distribution of each sample were obtained using a combination of thinsection and scanning electron microscopy, helium porosimetry and mercury intrusion porosimetry. Due to the lack of closing microcracks and compliant pores in low porosity samples, the travel times show slight changes with the confining pressure. Whereas the high porosity samples show remarkable reduction of travel time with the increase of confining pressure in both P- and S-wave. The samples show no changes in travel time with increasing confining pressure under constant differential pressure, and this behavior is taken to be representative of full saturation of the sample and hence used as a measure of quality control. The comparisons of Biot, Gassmann, squirt-Biot and squirt-Gassmann model predictions with the measured water saturated velocities show that the squirt mechanism is not active on all the studied samples. Biot mechanism is likely to be the principle dispersion mechanism in these samples. For S-wave velocities, Gassmann’s model consistently over-predict the saturated at low pressure and closely fit the measured velocities at high pressure, whereas, Biot model over-predicts the saturated velocities in most of the studied samples. The strains over the horizontal axis are higher than the vertical axis suggesting that the majority of the compliant pores and crack-like pores are oriented almost in direction parallel to the length of the sample. The static bulk modulus is always lower than dynamic one for all measured samples. The measured grain bulk modulus is reasonably close to the bulk modulus of the constituent mineral.

Subjects/Keywords: Shear modulus; Carbonate; Elastic properties; Ultrasonic velocity; Bulk modulus

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

APA (6^th Edition):

Bakhorji, A. M. (2010). Laboratory measurements of static and dynamic elastic properties in carbonate. (Doctoral Dissertation). University of Alberta. Retrieved from https://era.library.ualberta.ca/files/v118rf203

Chicago Manual of Style (16^th Edition):

Bakhorji, Aiman M. “Laboratory measurements of static and dynamic elastic properties in carbonate.” 2010. Doctoral Dissertation, University of Alberta. Accessed April 11, 2021. https://era.library.ualberta.ca/files/v118rf203.

MLA Handbook (7^th Edition):

Bakhorji, Aiman M. “Laboratory measurements of static and dynamic elastic properties in carbonate.” 2010. Web. 11 Apr 2021.

Vancouver:

Bakhorji AM. Laboratory measurements of static and dynamic elastic properties in carbonate. [Internet] [Doctoral dissertation]. University of Alberta; 2010. [cited 2021 Apr 11]. Available from: https://era.library.ualberta.ca/files/v118rf203.

Council of Science Editors:

Bakhorji AM. Laboratory measurements of static and dynamic elastic properties in carbonate. [Doctoral Dissertation]. University of Alberta; 2010. Available from: https://era.library.ualberta.ca/files/v118rf203

Penn State University

5. Tavassoti Kheiry, Pezhouhan. Non-Destructive Characterization of Asphalt Concrete Mixtures through Resonant Column Testing.

Degree: 2016, Penn State University

URL: https://submit-etda.libraries.psu.edu/catalog/dz010q056

► Asphalt concrete is a multiphase viscoelastic composite material; hence its mechanical properties change with frequency of the applied loads and the temperature. In many of… (more)

▼ Asphalt concrete is a multiphase viscoelastic composite material; hence its mechanical properties change with frequency of the applied loads and the temperature. In many of the design tools such as the Mechanistic Empirical Pavement Design Guide (MEPDG), changes in dynamic modulus as a function of the loading frequency is the primary input. There are very limited testing devices that can directly measure the shear modulus of asphalt concrete. Most of the available devices for asphalt concrete testing are limited to a maximum loading frequency of 33 Hz. However, devices that are capable of exerting loads at higher frequencies are generally limited with respect to the maximum attainable strains. Treating an asphaltic mix as a thermo-rheologically simple material makes it possible to extrapolate its viscoelastic behavior from the low frequency to the high frequency ends through a modulus master-curve. However, such extrapolations are not always accurate and can result in significant errors in pavement design and performance prediction. In this dissertation, a conventional soils testing Resonant Column (RC) apparatus is retrofitted to test stiffer materials such as asphalt concrete at a range of temperatures and strains. Through the proposed RC test, the frequency dependent modulus of asphalt concrete at frequencies considerably higher than those attainable by the available devices, i.e. up to 300 Hz, and at strain levels comparable to the conventional modulus tests (about 100 microstrains) were measured. A set of dynamic modulus (DM) tests were performed on both the full-size and the proposed small-size specimens. It was confirmed that the small specimens exhibit the same properties as the full-size specimens. Non-destructiveness of the RC testing of asphalt concrete was also confirmed by investigating the repeatability of RC tests at each temperature, the reproducibility of the same results after one complete set of temperature-frequency sweep tests, and the modulus changes from Impact Resonance (IR) tests. Thus, the same specimen can be used for conducting multiple tests at different temperatures. Finally, RC technique was successfully used to characterize a wide range of asphalt concrete technologies including: conventional Hot Mix Asphalt (HMA), Warm Mix Asphalt (WMA), high Reclaimed Asphalt Pavements (RAP) content, and high Recycled Asphalt Shingles (RAS) mixes. Results indicate that the conventional modulus master curve underpredicts the actual modulus at higher frequencies. Therefore, the proposed power-form modulus-frequency functions are recommended in this dissertation to be used along with a variable Poisson’s ratio to achieve a better prediction, when an indirect calculation of shear modulus of asphalt concrete is needed. It was concluded that RC test can non-destructively characterize different asphalt concrete technologies at a wide range of temperatures. The RC test provides useful insights about the high frequency modulus and damping of asphalt concrete mixes. Advisors/Committee Members: Tong Qiu, Dissertation Advisor/Co-Advisor, Mansour Solaimanian, Committee Chair/Co-Chair, Farshad Rajabipour, Committee Member, Patrick Joseph Fox, Committee Member, Clifford Jesse Lissenden III, Outside Member.

Subjects/Keywords: Asphalt Concrete; Nondestructive Test; Damping; Resonant Column Test; Shear Modulus; Dynamic Modulus

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APA (6^th Edition):

Tavassoti Kheiry, P. (2016). Non-Destructive Characterization of Asphalt Concrete Mixtures through Resonant Column Testing. (Thesis). Penn State University. Retrieved from https://submit-etda.libraries.psu.edu/catalog/dz010q056

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):

Tavassoti Kheiry, Pezhouhan. “Non-Destructive Characterization of Asphalt Concrete Mixtures through Resonant Column Testing.” 2016. Thesis, Penn State University. Accessed April 11, 2021. https://submit-etda.libraries.psu.edu/catalog/dz010q056.

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

MLA Handbook (7^th Edition):

Tavassoti Kheiry, Pezhouhan. “Non-Destructive Characterization of Asphalt Concrete Mixtures through Resonant Column Testing.” 2016. Web. 11 Apr 2021.

Vancouver:

Tavassoti Kheiry P. Non-Destructive Characterization of Asphalt Concrete Mixtures through Resonant Column Testing. [Internet] [Thesis]. Penn State University; 2016. [cited 2021 Apr 11]. Available from: https://submit-etda.libraries.psu.edu/catalog/dz010q056.

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

Council of Science Editors:

Tavassoti Kheiry P. Non-Destructive Characterization of Asphalt Concrete Mixtures through Resonant Column Testing. [Thesis]. Penn State University; 2016. Available from: https://submit-etda.libraries.psu.edu/catalog/dz010q056

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

University of New South Wales

6. Payan, Meghdad. Study of small strain dynamic properties of sands and silty sands.

Degree: Civil & Environmental Engineering, 2017, University of New South Wales

URL: http://handle.unsw.edu.au/1959.4/58122 ; https://unsworks.unsw.edu.au/fapi/datastream/unsworks:45429/SOURCE02?view=true

► Shear modulus (G), Young’s modulus (E) and damping ratio (D) are key properties of soils which play fundamental roles in the analysis and design of… (more)

▼ Shear modulus (G), Young’s modulus (E) and damping ratio (D) are key properties of soils which play fundamental roles in the analysis and design of geotechnical structures subjected to static and dynamic loading. Of particular interest for geotechnical engineers are the values of these properties at the range of small strains. The aim of this study is to investigate the influence of different parameters on the small-strain dynamic properties of sands and silty sands. The contributions made in the thesis include: i) A novel approach is proposed for the examination of the validity of stiffness models in capturing the effects of void ratio and confining pressure on the small-strain behaviour of granular soils; ii) Considering the significant influence of particle shape, new expressions for the evaluation of G_max and E_max for dry and saturated sands are proposed and validated using the results of a comprehensive set of torsional and flexural resonant column tests performed at a range of void ratios, confining pressures, particle shapes and grain size distributions. Adopting the theory of elasticity, the variation of Poisson’s ratio with the index properties of sands is also captured; iii) The influence of particle shape on the small-strain damping ratio of dry sands in shear (D_(s,min)) is studied through a comprehensive set of torsional resonant column tests. The effects of grain size distribution, particle shape and effective confining stress are incorporated into a general expression of D_(s,min) for the evaluation of the small-strain damping ratio of sands; iv) Based on a comprehensive set of experimental data, new models for the prediction of small-strain dynamic properties of sand-silt mixtures are developed. It is shown that while at low percentages of fines content, there is a significant difference between the dynamic properties of various types of sands, this variation will diminish as fines content of the mixture increases. In particular, beyond a specific percentage of fines content, the soil behaviour becomes thoroughly silt-dominant, rendering no significant influence of different sand properties on the small-strain shear and Young’s moduli, Poisson’s ratio and damping ratio; v) The influence of stress anisotropy on the small-strain shear modulus of sands are evaluated and a new G_max model is developed incorporating the contributions of grain size characteristics and particle shape in the prediction of G_max of sands subjected to stress anisotropy. It is shown that the influence of stress anisotropy on the small-strain shear modulus of sands is more pronounced for sands with irregularly shaped grains and wider grain size distributions as opposed to uniform sands of relatively rounded and spherical grains; vi) Finally, the proposed expression for the prediction of the small-strain shear modulus of dry and saturated sands is extended to evaluate the shear modulus of variably saturated sands incorporating the effective stress approach. Accordingly, the model is examined against several sets of experimental… Advisors/Committee Members: Khoshghalb, Arman, Civil & Environmental Engineering, Faculty of Engineering, UNSW, Khalili, Nasser, Civil & Environmental Engineering, Faculty of Engineering, UNSW, Senetakis, Konstantinos, Civil & Environmental Engineering, Faculty of Engineering, UNSW.

Subjects/Keywords: Damping ratio; Shear modulus; Young's modulus; Poisson's ratio; Particle shape; Grain size characteristics

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APA (6^th Edition):

Payan, M. (2017). Study of small strain dynamic properties of sands and silty sands. (Doctoral Dissertation). University of New South Wales. Retrieved from http://handle.unsw.edu.au/1959.4/58122 ; https://unsworks.unsw.edu.au/fapi/datastream/unsworks:45429/SOURCE02?view=true

Chicago Manual of Style (16^th Edition):

Payan, Meghdad. “Study of small strain dynamic properties of sands and silty sands.” 2017. Doctoral Dissertation, University of New South Wales. Accessed April 11, 2021. http://handle.unsw.edu.au/1959.4/58122 ; https://unsworks.unsw.edu.au/fapi/datastream/unsworks:45429/SOURCE02?view=true.

MLA Handbook (7^th Edition):

Payan, Meghdad. “Study of small strain dynamic properties of sands and silty sands.” 2017. Web. 11 Apr 2021.

Vancouver:

Payan M. Study of small strain dynamic properties of sands and silty sands. [Internet] [Doctoral dissertation]. University of New South Wales; 2017. [cited 2021 Apr 11]. Available from: http://handle.unsw.edu.au/1959.4/58122 ; https://unsworks.unsw.edu.au/fapi/datastream/unsworks:45429/SOURCE02?view=true.

Council of Science Editors:

Payan M. Study of small strain dynamic properties of sands and silty sands. [Doctoral Dissertation]. University of New South Wales; 2017. Available from: http://handle.unsw.edu.au/1959.4/58122 ; https://unsworks.unsw.edu.au/fapi/datastream/unsworks:45429/SOURCE02?view=true

NSYSU

7. Feng, Yu-ting. The investigation of mechanical properties of ZrCu/Zr/ZrCu amorphousï¼crystallineãnanolaminates with inclined interface by molecular statics simulation.

Degree: Master, Mechanical and Electro-Mechanical Engineering, 2012, NSYSU

URL: http://etd.lib.nsysu.edu.tw/ETD-db/ETD-search/view_etd?URN=etd-0723112-131954

► In this study, the mechanical properties of Cu-Zr binary bulk metallic glasses (BMG) were investigated at the nano-scale. The stable amorphous structures and corresponding energies… (more)

Subjects/Keywords: DFT; Cu-Zr BMGs; TFMGs; Molecular Static; Poisson ratio; Young's modulus; fitting; Bulk modulus; Shear modulus

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APA (6^th Edition):

Feng, Y. (2012). The investigation of mechanical properties of ZrCu/Zr/ZrCu amorphousï¼crystallineãnanolaminates with inclined interface by molecular statics simulation. (Thesis). NSYSU. Retrieved from http://etd.lib.nsysu.edu.tw/ETD-db/ETD-search/view_etd?URN=etd-0723112-131954

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):

Feng, Yu-ting. “The investigation of mechanical properties of ZrCu/Zr/ZrCu amorphousï¼crystallineãnanolaminates with inclined interface by molecular statics simulation.” 2012. Thesis, NSYSU. Accessed April 11, 2021. http://etd.lib.nsysu.edu.tw/ETD-db/ETD-search/view_etd?URN=etd-0723112-131954.

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

MLA Handbook (7^th Edition):

Feng, Yu-ting. “The investigation of mechanical properties of ZrCu/Zr/ZrCu amorphousï¼crystallineãnanolaminates with inclined interface by molecular statics simulation.” 2012. Web. 11 Apr 2021.

Vancouver:

Feng Y. The investigation of mechanical properties of ZrCu/Zr/ZrCu amorphousï¼crystallineãnanolaminates with inclined interface by molecular statics simulation. [Internet] [Thesis]. NSYSU; 2012. [cited 2021 Apr 11]. Available from: http://etd.lib.nsysu.edu.tw/ETD-db/ETD-search/view_etd?URN=etd-0723112-131954.

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

Council of Science Editors:

Feng Y. The investigation of mechanical properties of ZrCu/Zr/ZrCu amorphousï¼crystallineãnanolaminates with inclined interface by molecular statics simulation. [Thesis]. NSYSU; 2012. Available from: http://etd.lib.nsysu.edu.tw/ETD-db/ETD-search/view_etd?URN=etd-0723112-131954

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

8. Suprunenko, Ganna. SUCTION-CONTROLLED CYCLIC TRIAXIAL TEST TO MEASURE STRAIN-DEPENDENT DYNAMIC SHEAR MODULUS OF UNSATURATED SAND.

Degree: MS, 2015, University of New Hampshire

URL: https://scholars.unh.edu/thesis/1036

► Recent advancement in unsaturated soil mechanics revealed the influence of the degree of saturation on dynamic properties of soils due to inter-particle suction forces. However,… (more)

Subjects/Keywords: Dynamic triaxial testing; Ottawa F75 sand; Shear modulus; Shear modulus reduction curve; Unsaturated soils; Civil engineering

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APA (6^th Edition):

Suprunenko, G. (2015). SUCTION-CONTROLLED CYCLIC TRIAXIAL TEST TO MEASURE STRAIN-DEPENDENT DYNAMIC SHEAR MODULUS OF UNSATURATED SAND. (Thesis). University of New Hampshire. Retrieved from https://scholars.unh.edu/thesis/1036

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):

Suprunenko, Ganna. “SUCTION-CONTROLLED CYCLIC TRIAXIAL TEST TO MEASURE STRAIN-DEPENDENT DYNAMIC SHEAR MODULUS OF UNSATURATED SAND.” 2015. Thesis, University of New Hampshire. Accessed April 11, 2021. https://scholars.unh.edu/thesis/1036.

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

MLA Handbook (7^th Edition):

Suprunenko, Ganna. “SUCTION-CONTROLLED CYCLIC TRIAXIAL TEST TO MEASURE STRAIN-DEPENDENT DYNAMIC SHEAR MODULUS OF UNSATURATED SAND.” 2015. Web. 11 Apr 2021.

Vancouver:

Suprunenko G. SUCTION-CONTROLLED CYCLIC TRIAXIAL TEST TO MEASURE STRAIN-DEPENDENT DYNAMIC SHEAR MODULUS OF UNSATURATED SAND. [Internet] [Thesis]. University of New Hampshire; 2015. [cited 2021 Apr 11]. Available from: https://scholars.unh.edu/thesis/1036.

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

Council of Science Editors:

Suprunenko G. SUCTION-CONTROLLED CYCLIC TRIAXIAL TEST TO MEASURE STRAIN-DEPENDENT DYNAMIC SHEAR MODULUS OF UNSATURATED SAND. [Thesis]. University of New Hampshire; 2015. Available from: https://scholars.unh.edu/thesis/1036

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

University of Waterloo

9. Irfan, Muhammad. Advancements in bender-element testing - frequency effects.

Degree: 2019, University of Waterloo

URL: http://hdl.handle.net/10012/15138

► Modern building and bridge codes require seismic design of foundations and structures; for which, the evaluation of the soil’s response to dynamic loads is an… (more)

▼ Modern building and bridge codes require seismic design of foundations and structures; for which, the evaluation of the soil’s response to dynamic loads is an important requirement in seismic design. The dynamic soil response is governed by its dynamic properties such as shear modulus (wave velocity) and damping ratio. These soil dynamic properties are typically measured in laboratory mostly using a bender element system (BE) or a resonant column (RC) device. However, the operating frequency range of BEs (e.g. 1 to 15 kHz) and the RC (e.g. 20 to 220 Hz) are not representative of typical earthquake loads (e.g. 0.1 to 10 Hz). In addition, there are significant limitations in BE and RC testing which reduce their reliability. Thus, current seismic designs could be either conservative or unsafe. A major limitation in BE testing is that there is no standard procedure; mostly because the soil-BE interaction is not well understood; and the characterization of BE inside a soil specimen was not possible. On the other hand in RC testing, the soil dynamic properties cannot be evaluated simultaneously as function of frequency and strain. In a typical narrow-band resonant column test (e.g. sine sweep, random noise), the induced shear strains are different at each frequency component. Therefore, the main objectives of this study are to understand better the soil-BE interaction; which will provide the basis for the development of reliable guidelines for BE testing; and to verify the BE test results using the standard RC device. The main objectives are achieved by testing the BE using a state-of-the-art laser vibrometer and a newly developed transparent soil to measure the actual response of the bender element transmitter (Tx) and receiver (Rx) inside different media such as air, liquids, and sand under different confinements. Then, the dynamic characteristics of the Tx are measured using advanced modal analysis techniques originally developed for structural applications (e.g. Blind Source Separation). The modal analysis is used to investigate if the different BE vibration modes correspond to a cantilever beam, as currently assumed or a cantilever plate. The Rx is also studied to assess the effects of compressional waves, the total damping of the BE system inside the medium on the actual evaluation of the shear wave velocity of the soil. In addition, the dependence of the output voltage from the Rx and the applied strain is investigated at different confining pressures. The thesis concludes with the dynamic characterization of a sensitive clay (Leda clay) that is present in large areas of Eastern Canada (Leda or Champlain sea clay) BE and RC tests are performed on unique undisturbed samples. All results presented in this study represent to the averages of multiple tests (more than 10 for RC and more than 500 for BEs). In all cases, the maximum coefficient of variance was 3 % which demonstrates the repeatability of the measurements. Contrary to a common assumption in BE testing, measurements on the transparent soil show that the…

Subjects/Keywords: bender element testing; resonant column testing; shear modulus; damping ratio; shear wave velocity; soil dynamics

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APA (6^th Edition):

Irfan, M. (2019). Advancements in bender-element testing - frequency effects. (Thesis). University of Waterloo. Retrieved from http://hdl.handle.net/10012/15138

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):

Irfan, Muhammad. “Advancements in bender-element testing - frequency effects.” 2019. Thesis, University of Waterloo. Accessed April 11, 2021. http://hdl.handle.net/10012/15138.

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

MLA Handbook (7^th Edition):

Irfan, Muhammad. “Advancements in bender-element testing - frequency effects.” 2019. Web. 11 Apr 2021.

Vancouver:

Irfan M. Advancements in bender-element testing - frequency effects. [Internet] [Thesis]. University of Waterloo; 2019. [cited 2021 Apr 11]. Available from: http://hdl.handle.net/10012/15138.

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

Council of Science Editors:

Irfan M. Advancements in bender-element testing - frequency effects. [Thesis]. University of Waterloo; 2019. Available from: http://hdl.handle.net/10012/15138

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

KTH

10. Larsson, David. Accuracy Assessment of Shear Wave Elastography for Arterial Applications by Mechanical Testing.

Degree: Solid Mechanics (Div.), 2014, KTH

URL: http://urn.kb.se/resolve?urn=urn:nbn:se:kth:diva-160091

► Arterial stiffness is an important biometric in predicting cardiovascular diseases, since mechanical properties serve as indicators of several pathologies such as e.g. atherosclerosis. Shear… (more)

Subjects/Keywords: Accuracy assessment; Arteries; Phantoms; Poly(vinyl alcohol); Mechanical testing; Shear Modulus; Shear Wave Elastography; Ultrasound

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APA (6^th Edition):

Larsson, D. (2014). Accuracy Assessment of Shear Wave Elastography for Arterial Applications by Mechanical Testing. (Thesis). KTH. Retrieved from http://urn.kb.se/resolve?urn=urn:nbn:se:kth:diva-160091

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):

Larsson, David. “Accuracy Assessment of Shear Wave Elastography for Arterial Applications by Mechanical Testing.” 2014. Thesis, KTH. Accessed April 11, 2021. http://urn.kb.se/resolve?urn=urn:nbn:se:kth:diva-160091.

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

MLA Handbook (7^th Edition):

Larsson, David. “Accuracy Assessment of Shear Wave Elastography for Arterial Applications by Mechanical Testing.” 2014. Web. 11 Apr 2021.

Vancouver:

Larsson D. Accuracy Assessment of Shear Wave Elastography for Arterial Applications by Mechanical Testing. [Internet] [Thesis]. KTH; 2014. [cited 2021 Apr 11]. Available from: http://urn.kb.se/resolve?urn=urn:nbn:se:kth:diva-160091.

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

Council of Science Editors:

Larsson D. Accuracy Assessment of Shear Wave Elastography for Arterial Applications by Mechanical Testing. [Thesis]. KTH; 2014. Available from: http://urn.kb.se/resolve?urn=urn:nbn:se:kth:diva-160091

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

University of Kentucky

11. Curd, Jason M. Unsaturated Soil Parameters From Field Stiffness Measurements.

Degree: 2013, University of Kentucky

URL: https://uknowledge.uky.edu/ce_etds/11

► The behavior of unsaturated soils depends heavily on material properties and soil conditions. In Geotechnical Engineering, compacted soils are frequently used as fill material, and… (more)

Subjects/Keywords: Unsaturated Soil Mechanics; Shear Modulus; Soil Stiffness; Shear Wave Velocity; Geogauge; Civil Engineering; Geotechnical Engineering

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APA (6^th Edition):

Curd, J. M. (2013). Unsaturated Soil Parameters From Field Stiffness Measurements. (Masters Thesis). University of Kentucky. Retrieved from https://uknowledge.uky.edu/ce_etds/11

Chicago Manual of Style (16^th Edition):

Curd, Jason M. “Unsaturated Soil Parameters From Field Stiffness Measurements.” 2013. Masters Thesis, University of Kentucky. Accessed April 11, 2021. https://uknowledge.uky.edu/ce_etds/11.

MLA Handbook (7^th Edition):

Curd, Jason M. “Unsaturated Soil Parameters From Field Stiffness Measurements.” 2013. Web. 11 Apr 2021.

Vancouver:

Curd JM. Unsaturated Soil Parameters From Field Stiffness Measurements. [Internet] [Masters thesis]. University of Kentucky; 2013. [cited 2021 Apr 11]. Available from: https://uknowledge.uky.edu/ce_etds/11.

Council of Science Editors:

Curd JM. Unsaturated Soil Parameters From Field Stiffness Measurements. [Masters Thesis]. University of Kentucky; 2013. Available from: https://uknowledge.uky.edu/ce_etds/11

Texas A&M University

12. Gou, Kun 1981-. Recovery of the Shear Modulus and Residual Stress of Hyperelastic Soft Tissues by Inverse Spectral Techniques.

Degree: PhD, Mathematics, 2012, Texas A&M University

URL: http://hdl.handle.net/1969.1/148199

► Inverse spectral techniques are developed in this dissertation for recovering the shear modulus and residual stress of soft tissues. Shear modulus is one of several… (more)

▼ Inverse spectral techniques are developed in this dissertation for recovering the shear modulus and residual stress of soft tissues. Shear modulus is one of several quantities for measuring the stiffness of a material, and hence estimating it accurately is an important factor in tissue characterization. Residual stress is a stress that can exist in a body in the absence of externally applied loads, and beneficial for biological growth and remodeling. It is a challenge to recover the two quantities in soft tissues both theoretically and experimentally. The current inverse spectral techniques recover the two unknowns invasively, and are theoretically based on a novel use of the intravascular ultrasound technology (IVUS) by obtaining several natural frequencies of the vessel wall material. As the IVUS is interrogating inside the artery, it produces small amplitude, high frequency time harmonic vibrations superimposed on the quasistatic deformation of the blood pressure pre-stressed and residually stressed artery. The arterial wall is idealized as a nonlinear isotropic cylindrical hyperelastic body for computational convenience. A boundary value problem is formulated for the response of the arterial wall within a specific class of quasistatic deformations reflexive of the response due to imposed blood pressures. Subsequently, a boundary value problem is developed from intravascular ultrasound interrogation generating small amplitude, high frequency time harmonic vibrations superimposed on the quasistatic finite deformations via an asymptotic construction of the solutions. This leads to a system of second order ordinary Sturm-Liouville problems (SLP) with the natural eigenfrequencies from IVUS implementation as eigenvalues of the SLP. They are then employed to reconstruct the shear modulus and residual stress in a nonlinear approach by inverse spectral techniques. The shear modulus is recovered by a multidimensional secant method (MSM). The MSM avoids computing the Jacobian matrix of the equations and is shown to be convenient for manipulation. Residual stress is recovered via an optimization approach (OA) instead of the traditional equation-solving method. The OA increases the robustness of the algorithms by overdetermination of the problem, and comprehensive tests are performed to guarantee the accuracy of the solution. Numerical examples are displayed to show the viability of these techniques. Advisors/Committee Members: Walton, Jay R (advisor), Lazarov, Raytcho (committee member), Narcowich, Francis J (committee member), Kinra, Vikram (committee member).

Subjects/Keywords: IVUS; arterial wall; inverse spectral problems; residual stress; shear modulus

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APA (6^th Edition):

Gou, K. 1. (2012). Recovery of the Shear Modulus and Residual Stress of Hyperelastic Soft Tissues by Inverse Spectral Techniques. (Doctoral Dissertation). Texas A&M University. Retrieved from http://hdl.handle.net/1969.1/148199

Chicago Manual of Style (16^th Edition):

Gou, Kun 1981-. “Recovery of the Shear Modulus and Residual Stress of Hyperelastic Soft Tissues by Inverse Spectral Techniques.” 2012. Doctoral Dissertation, Texas A&M University. Accessed April 11, 2021. http://hdl.handle.net/1969.1/148199.

MLA Handbook (7^th Edition):

Gou, Kun 1981-. “Recovery of the Shear Modulus and Residual Stress of Hyperelastic Soft Tissues by Inverse Spectral Techniques.” 2012. Web. 11 Apr 2021.

Vancouver:

Gou K1. Recovery of the Shear Modulus and Residual Stress of Hyperelastic Soft Tissues by Inverse Spectral Techniques. [Internet] [Doctoral dissertation]. Texas A&M University; 2012. [cited 2021 Apr 11]. Available from: http://hdl.handle.net/1969.1/148199.

Council of Science Editors:

Gou K1. Recovery of the Shear Modulus and Residual Stress of Hyperelastic Soft Tissues by Inverse Spectral Techniques. [Doctoral Dissertation]. Texas A&M University; 2012. Available from: http://hdl.handle.net/1969.1/148199

Texas A&M University

13. Brackin, Michael S. Development of a Procedure to Evaluate the Shear Modulus of Laminated Glass Interlayers.

Degree: MS, Civil Engineering, 2010, Texas A&M University

URL: http://hdl.handle.net/1969.1/ETD-TAMU-2010-05-7990

► Laminated glass is comprised of multiple glass plates coupled together in a sandwich construction through the use of a polymorphous interlayer that acts as a… (more)

▼ Laminated glass is comprised of multiple glass plates coupled together in a sandwich construction through the use of a polymorphous interlayer that acts as a bonding agent between the glass plates. Laminated glass offers several advantages over monolithic glass including the ability to resist post fracture collapse, improved sound insulation, lower ultraviolent light trans-mission, and improved thermal insulation. Because the stiffness of the interlayer is often many orders of magnitude less than that of the glass, plane sections prior to loading do not remain plane throughout the laminate?s thickness after load is applied. The behavior of laminated glass is controlled by the stiffness of the interlayer. This behavior rules out the use of classical theoretical formulations for thin plates. In such cases, it is necessary to use specially formulated equations or finite element analyses to evaluate the performance of laminated glass. Previous attempts have been made to develop procedures to quantify the interlayer stiffness for use in laminated glass design. However, there is no widely accepted technique that can be referenced for use. It is known that the interlayer stiffness is a function of both temperature and load duration. The primary objective of this thesis is to formalize a standard procedure to estimate the in situ interlayer shear modulus through the use of nondestructive testing. Physical experiments were carried out on simply supported laminated glass beams subject to three point loading in a temperature controlled environmental testing chamber. Strains and temperatures were recorded as a function of time. These data were used in combination with results from finite element analyses to quantify the variation of the interlayer stiffness as a function of temperature and load duration for a given laminated glass beam. This procedure was applied to three common types of interlayer materials: freshly man-factured polyvinyl butyral (PVB), over a decade old PVB, and freshly manufactured SentryGlas Plus (SGP). Results from these efforts provide specific design guidance for laminated glass that incorporates these interlayer materials. Further, the procedure was applied to various data presented in open literature by previous researchers. In addition, a standardized procedure to estimate interlayer stiffness is provided for the development of additional interlayer properties as required. Advisors/Committee Members: Beason, William L. (advisor), Kohutek, Terry L. (committee member), Hogan, Harry A. (committee member).

Subjects/Keywords: Laminated Glass; Interlayer Shear Modulus

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APA (6^th Edition):

Brackin, M. S. (2010). Development of a Procedure to Evaluate the Shear Modulus of Laminated Glass Interlayers. (Masters Thesis). Texas A&M University. Retrieved from http://hdl.handle.net/1969.1/ETD-TAMU-2010-05-7990

Chicago Manual of Style (16^th Edition):

Brackin, Michael S. “Development of a Procedure to Evaluate the Shear Modulus of Laminated Glass Interlayers.” 2010. Masters Thesis, Texas A&M University. Accessed April 11, 2021. http://hdl.handle.net/1969.1/ETD-TAMU-2010-05-7990.

MLA Handbook (7^th Edition):

Brackin, Michael S. “Development of a Procedure to Evaluate the Shear Modulus of Laminated Glass Interlayers.” 2010. Web. 11 Apr 2021.

Vancouver:

Brackin MS. Development of a Procedure to Evaluate the Shear Modulus of Laminated Glass Interlayers. [Internet] [Masters thesis]. Texas A&M University; 2010. [cited 2021 Apr 11]. Available from: http://hdl.handle.net/1969.1/ETD-TAMU-2010-05-7990.

Council of Science Editors:

Brackin MS. Development of a Procedure to Evaluate the Shear Modulus of Laminated Glass Interlayers. [Masters Thesis]. Texas A&M University; 2010. Available from: http://hdl.handle.net/1969.1/ETD-TAMU-2010-05-7990

Texas A&M University

14. Liu, Xuchen. Continuous Versus Discontinuous Elastic Modulus Distribution in Inverse Problems Based on Finite Element Methods.

Degree: MS, Mechanical Engineering, 2015, Texas A&M University

URL: http://hdl.handle.net/1969.1/155332

► Elasticity imaging, which is also known as Elastography, aims to determine the elastic property distribution of non-homogeneous deformable solids such as soft tissues. This can… (more)

▼ Elasticity imaging, which is also known as Elastography, aims to determine the elastic property distribution of non-homogeneous deformable solids such as soft tissues. This can be done non-destructively using displacement fields measured with medical imaging modalities, such as ultrasound or magnetic resonance imaging. Elasticity imaging can potentially be used to detect tumors based on the stiffness contrast between different materials. This requires the solution of an inverse problem in elasticity. This field has been growing very fast in the past decade. One of the most useful applications of elasticity imaging may be in breast cancer diagnosis, where the tumor could potentially be detected and visualized by its stiffness contrast from its surrounding tissues. In this work the inverse problem will be solved for the shear modulus which is directly related to the Young’s modulus through the Poisson’s ratio. The inverse problem is posed as a constrained optimization problem, where the difference between a computed (predicted) and measured displacement field is minimized. The computed displacement field satisfies the equations of equilibrium. The material is modeled as an isotropic and incompressible material. The present work focuses on assessing the solution of the inverse problem for problem domains defined with a continuous and discontinuous shear modulus distribution. In particular, two problem domains will be considered: 1) a stiff inclusion in a homogeneous background representing a stiff tumor surrounded by soft tissues, 2) a layered ring model representing an arterial wall cross-section. The hypothetical "measured" displacement field for these problem domains will be created by solving the finite element forward problem. Additionally, noise will be added to the displacement field to simulate noisy measured displacement data. According to the results of my thesis work, the potential of the elasticity imaging in the medical field is emerging. The inclusion in problem domain 1, representing a stiffer tumor in a uniform background, can be found and located in the shear modulus reconstructions. Thus, these reconstructed images can potentially be used to detect tumors in the medical field. Advisors/Committee Members: Goenezen, Sevan (advisor), Liang, Hong (committee member), Muliana, Anastasia (committee member).

Subjects/Keywords: Elasticity Imaging; forward problem; inverse problem; shear modulus

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APA (6^th Edition):

Liu, X. (2015). Continuous Versus Discontinuous Elastic Modulus Distribution in Inverse Problems Based on Finite Element Methods. (Masters Thesis). Texas A&M University. Retrieved from http://hdl.handle.net/1969.1/155332

Chicago Manual of Style (16^th Edition):

Liu, Xuchen. “Continuous Versus Discontinuous Elastic Modulus Distribution in Inverse Problems Based on Finite Element Methods.” 2015. Masters Thesis, Texas A&M University. Accessed April 11, 2021. http://hdl.handle.net/1969.1/155332.

MLA Handbook (7^th Edition):

Liu, Xuchen. “Continuous Versus Discontinuous Elastic Modulus Distribution in Inverse Problems Based on Finite Element Methods.” 2015. Web. 11 Apr 2021.

Vancouver:

Liu X. Continuous Versus Discontinuous Elastic Modulus Distribution in Inverse Problems Based on Finite Element Methods. [Internet] [Masters thesis]. Texas A&M University; 2015. [cited 2021 Apr 11]. Available from: http://hdl.handle.net/1969.1/155332.

Council of Science Editors:

Liu X. Continuous Versus Discontinuous Elastic Modulus Distribution in Inverse Problems Based on Finite Element Methods. [Masters Thesis]. Texas A&M University; 2015. Available from: http://hdl.handle.net/1969.1/155332

Delft University of Technology

15. Dijkink, Laura (author). Mechanics of wrinkled graphene membranes.

Degree: 2019, Delft University of Technology

URL: http://resolver.tudelft.nl/uuid:47248a11-bf37-45f1-8528-62631329a885

►

The outstanding mechanical properties of graphene have made it a suitable candidate for awide range of sensor and actuator applications in modern technology. However, before… (more)

▼

The outstanding mechanical properties of graphene have made it a suitable candidate for awide range of sensor and actuator applications in modern technology. However, before the full potential of future applications can be achieved, a proper characterisation of the fundamental properties of graphene is crucial. The aim of this project was to contribute to the understanding of the mechanics of graphene membranes in presence of surface imperfections. To this end two configurations are investigated: ribbons and cantilevers, respectively. Wrinkled graphene nanoribbons are used to investigate the mechanical behaviour during the transition from the wrinkled state to the flat state. A molecular dynamics model has been developed of a single layer graphene ribbon to describe both the formation of wrinkles as well as the transition from the wrinkled state to the flat state. Also, a continuum model was developed to investigate the formation of wrinkles in graphene nanoribbons. Different constitutive laws have been investigated to describe the mechanical response of wrinkled membranes during the transition from the wrinkled state to the flat state. It was concluded that an exponential version of Hooke’s law fails to describe this transition correctly. The transition is however well described by the first order compressible Ogden’s law. Ogden’s law provided further insights into different mechanical properties of the wrinkled layer. Ogden’s law predicted that wrinkledmembranes exhibit a negative Poisson’s ratio at small strains, which is in agreement with previous research. Also, Ogden’s law predicted a decreasing shearmodulus and an increasing Poisson’s ratio after flattening of the membrane. Single layer graphene cantilevers show great potential, however, due to the difficult manufacturing of these fragile structures they remain virtually unstudied. Herein, a molecular dynamics model has been developed to investigate if nanocantilevers could be stabilised by implying a curvature. We found that, depending on the aspect ratio of the membrane and the applied rate of curvature, single layer graphene cantilevers could be (partly) stabilised by implying a curvature. In conclusion, with this research we provided new insights for designing and investigating the next generation of graphene nanoelectromechanical devices.

Mechanical Engineering

Advisors/Committee Members: Alijani, Farbod (mentor), Sajadi, Banafsheh (mentor), Ayas, Can (graduation committee), Steeneken, Peter (graduation committee), Delft University of Technology (degree granting institution).

Subjects/Keywords: Graphene; wrinkles; constitutive modeling; nonlinear identification; Poisson's ratio; Shear modulus

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APA (6^th Edition):

Dijkink, L. (. (2019). Mechanics of wrinkled graphene membranes. (Masters Thesis). Delft University of Technology. Retrieved from http://resolver.tudelft.nl/uuid:47248a11-bf37-45f1-8528-62631329a885

Chicago Manual of Style (16^th Edition):

Dijkink, Laura (author). “Mechanics of wrinkled graphene membranes.” 2019. Masters Thesis, Delft University of Technology. Accessed April 11, 2021. http://resolver.tudelft.nl/uuid:47248a11-bf37-45f1-8528-62631329a885.

MLA Handbook (7^th Edition):

Dijkink, Laura (author). “Mechanics of wrinkled graphene membranes.” 2019. Web. 11 Apr 2021.

Vancouver:

Dijkink L(. Mechanics of wrinkled graphene membranes. [Internet] [Masters thesis]. Delft University of Technology; 2019. [cited 2021 Apr 11]. Available from: http://resolver.tudelft.nl/uuid:47248a11-bf37-45f1-8528-62631329a885.

Council of Science Editors:

Dijkink L(. Mechanics of wrinkled graphene membranes. [Masters Thesis]. Delft University of Technology; 2019. Available from: http://resolver.tudelft.nl/uuid:47248a11-bf37-45f1-8528-62631329a885

University of Ottawa

16. Han, Zhong. Modelling Stiffness and Shear Strength of Compacted Subgrade Soils .

Degree: 2016, University of Ottawa

URL: http://hdl.handle.net/10393/35059

► Compacted soils are frequently used as subgrade for pavements as well as commercial and residential buildings. The stiffness and shear strength properties of compacted soils,… (more)

▼ Compacted soils are frequently used as subgrade for pavements as well as commercial and residential buildings. The stiffness and shear strength properties of compacted soils, which are collectively denoted as Ω in this thesis, fluctuate with moisture content changes that result from the influence of environmental factors such as the evaporation and infiltration. For example, mechanistic pavement design methods require the information of resilient modulus (MR), which is the soil stiffness behavior under cyclic traffic loading, and its variation with respect to the soil moisture content determined from laboratory tests or estimation methods. Significant advances have been made during the last five decades to understand and model the variation of the Ω with respect to soil moisture content and soil suction (s) based on the principles of mechanics of unsaturated soils. There are a variety of models presently available in the literature relating the Ω to the s using different approaches. There are however uncertainties extending these models for predicting Ω - s relationships when they are used for a larger soil suction range. In addition, the good performance of these models are only valid for certain soil types for which they were developed and calibrated. Studies presented in this thesis are directed towards developing a unified methodology for modelling the relationship between the Ω and the s using limited while easy-to-obtain information. However, more emphasis has been focused on the MR - s relationships of pavement subgrade soils considering the need for the application of the mechanistic pavement design methods in Canada. The following studies have been conducted: (i) State-of-the-art review on existing equations in the literature for the MR - s relationships is summarized. A comparison study is followed to discuss the strengths and limitations of these equations; (ii) A unified methodology for modelling the Ω - s relationships is proposed. Experimental data on 25 different soils are used to verify the proposed unified methodology. The investigations are applied on small strain shear modulus, elastic modulus, and peak and critical shear strength. Good predictions are achieved for all of the investigated soils; (iii) Performance of the proposed methodology is examined for the MR - s relationships using experimental data of 11 subgrade soils. Reasonably good predictions are achieved for all of the subgrade soils; (iv) Extensive experimental investigations are conducted on the MR - s relationships for several subgrade soils collected from various regions in Canada. Experimental results suggest non-linear variation in the MR with respect to s, moisture content and the external stress. The measured results are modelled using the proposed methodology with adequate success; (v) Additional experimental investigations are performed to determine the variation of the elastic modulus (E) and unconfined compression strength (qu) with the s and the gravimetric moisture content (w) for several Canadian subgrade soils.…

Subjects/Keywords: Stiffness; Shear strength; Unsaturated soil; Prediction; Pavement subgrade; Resilient modulus

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

APA (6^th Edition):

Han, Z. (2016). Modelling Stiffness and Shear Strength of Compacted Subgrade Soils . (Thesis). University of Ottawa. Retrieved from http://hdl.handle.net/10393/35059

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):

Han, Zhong. “Modelling Stiffness and Shear Strength of Compacted Subgrade Soils .” 2016. Thesis, University of Ottawa. Accessed April 11, 2021. http://hdl.handle.net/10393/35059.

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

MLA Handbook (7^th Edition):

Han, Zhong. “Modelling Stiffness and Shear Strength of Compacted Subgrade Soils .” 2016. Web. 11 Apr 2021.

Vancouver:

Han Z. Modelling Stiffness and Shear Strength of Compacted Subgrade Soils . [Internet] [Thesis]. University of Ottawa; 2016. [cited 2021 Apr 11]. Available from: http://hdl.handle.net/10393/35059.

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

Council of Science Editors:

Han Z. Modelling Stiffness and Shear Strength of Compacted Subgrade Soils . [Thesis]. University of Ottawa; 2016. Available from: http://hdl.handle.net/10393/35059

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

University of Sydney

17. Duraisamy, Youventharan. Strength And Stiffness Improvement Of Bio-Cemented Sydney Sand .

Degree: 2016, University of Sydney

URL: http://hdl.handle.net/2123/15533

► This thesis explores the performance of small scale cemented soil columns produced using soil mixing with cement resulting from bacterially mediated reactions that precipitate calcium… (more)

▼ This thesis explores the performance of small scale cemented soil columns produced using soil mixing with cement resulting from bacterially mediated reactions that precipitate calcium carbonate, a process often referred to as bio-cementation. Bio-cementation has received considerable research attention over the last decade as it has the potential to complement existing ground improvement techniques and mitigate environmental concerns with currently used materials. Previous research has concentrated on pumping and injection techniques because of concerns that bacteria will be unable to survive the stresses associated with industrial mixing processes, however it has been difficult to create uniform bio-cemented soil masses. In this thesis the ureolytic bacterium, Bacillus Megaterium, not previously reported in bio-cementation studies, has been investigated to determine its viability and efficiency as a microbe for mediating the calcite precipitation. It has been found that the highest hydrolysis rate is recorded when calcium concentrations are double the urea concentrations, and that significant amounts of calcite can be precipitated in a single mixing process. Unconfined compressive strength (UCS) tests and a series of triaxial tests have been conducted to quantify the effects of the bio-cementation on the mechanical response. Bender elements mounted in the triaxial cell have also been used to monitor the shear wave velocity during curing and shearing. The results of mechanical tests on the bio-cemented sand have been compared with tests on gypsum cemented and uncemented specimens. It has been found that bio-cementation by mixing produces homogeneous specimens with similar strengths and stiffnesses to the commonly used flushing or injection technique. To assess the performance of in-situ mixed, 38 mm diameter, bio-cemented sand columns a small scale in-situ mixing technique was used to create the model columns. Foundation tests have been performed at 1-g in a cylindrical tank with diameter of 600 mm. A significant improvement was observed in the response of foundations when placed on bio-cemented columns, and this was similar to the improvement from more conventional gypsum cements. These tests confirmed the feasibility of using an in-situ mixing technique with bio-cementation and provided valuable insight into the factors that must be considered in developing field applications. This thesis also has demonstrated repair strategies and techniques to encourage healing and self-healing should damage occur in foundations. Results from tests performed to investigate the ability of biocement to repair cemented soil columns are reported.

Subjects/Keywords: Biocementation; Shear Modulus; Biocemented Column; Calcite Precipitation; Urea Hydrolysis; Soil Mixing

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APA (6^th Edition):

Duraisamy, Y. (2016). Strength And Stiffness Improvement Of Bio-Cemented Sydney Sand . (Thesis). University of Sydney. Retrieved from http://hdl.handle.net/2123/15533

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):

Duraisamy, Youventharan. “Strength And Stiffness Improvement Of Bio-Cemented Sydney Sand .” 2016. Thesis, University of Sydney. Accessed April 11, 2021. http://hdl.handle.net/2123/15533.

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

MLA Handbook (7^th Edition):

Duraisamy, Youventharan. “Strength And Stiffness Improvement Of Bio-Cemented Sydney Sand .” 2016. Web. 11 Apr 2021.

Vancouver:

Duraisamy Y. Strength And Stiffness Improvement Of Bio-Cemented Sydney Sand . [Internet] [Thesis]. University of Sydney; 2016. [cited 2021 Apr 11]. Available from: http://hdl.handle.net/2123/15533.

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

Council of Science Editors:

Duraisamy Y. Strength And Stiffness Improvement Of Bio-Cemented Sydney Sand . [Thesis]. University of Sydney; 2016. Available from: http://hdl.handle.net/2123/15533

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

Iowa State University

18. Xue, Ziqiang. Contsruction and performance of chemically and mechanically stabilized granular road test sections.

Degree: 2020, Iowa State University

URL: https://lib.dr.iastate.edu/etd/18430

► Granular surface roads in rural Iowa were frequently subjected to freeze-thaw cycle. Which resulting road damage such as frost heave, frost boils, thaw weakening, rutting… (more)

▼ Granular surface roads in rural Iowa were frequently subjected to freeze-thaw cycle. Which resulting road damage such as frost heave, frost boils, thaw weakening, rutting and potholes. These damages increase the maintenance costs, bring public safety issues, and cause inconveniences to the traffic. Several stabilization methods have been tested by pervious study Phase II Iowa Highway Research Board Project TR-664 “Low-Cost Rural Surface Alternatives: Demonstration Project” for improving the resistance towards freeze-thaw cycle damage, and this project focused on investigating additional soil stabilization methods for preventing Iowa's rural roads from freeze-thaw cycle damage.31 test sections in four different Iowa counties were selected in fall 2018 for this project, and six mechanical methods and five chemical stabilization methods were implemented and examined in all these sections. To analysis the damage caused by freeze-thaw cycles, field and laboratory tests were continually performed for the next two years, including winter 2018, spring 2019, winter 2019 and spring 2020. The field tests include road surface survey, falling weight deflectometer (FWD), light weight deflectometer (LWD), dynamic cone penetrometer (DCP), nuclear gauge density and sample collection. The laboratory tests include sieve analysis, Atterberg limit tests, shear strength tests and durability tests. Along with two years of study, shear strength and composite elastic modulus were significantly improved by combining cement treatment methods and the optimized gradation with clay slurry method compare to other Test Sections. The steel slag sections show good resistance performance at beginning but cannot keep it well at the second year. Except the cement treatment method, all the chemical stabilized methods are worse than control sections. The ground tire rubber section works awful so the research team eliminate this section at beginning. Accordance with the cost results, the 12” subgrade cement-treatment method are too expensive on hauling and equipment renting. The steel slag sections have relatively high cost on hauling since the material resource are distance away from construction site. The cost of RAP asphalt material is also going up these two years. Above all, the most cost-effective method was found to be the 4" surface cement-treatment method combined and the optimized gradation with clay slurry (OGCS) method.

Subjects/Keywords: Cost summary; Elastic modulus; Granular roadway; Shear strength; Stabilization methods

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APA (6^th Edition):

Xue, Z. (2020). Contsruction and performance of chemically and mechanically stabilized granular road test sections. (Thesis). Iowa State University. Retrieved from https://lib.dr.iastate.edu/etd/18430

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):

Xue, Ziqiang. “Contsruction and performance of chemically and mechanically stabilized granular road test sections.” 2020. Thesis, Iowa State University. Accessed April 11, 2021. https://lib.dr.iastate.edu/etd/18430.

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

MLA Handbook (7^th Edition):

Xue, Ziqiang. “Contsruction and performance of chemically and mechanically stabilized granular road test sections.” 2020. Web. 11 Apr 2021.

Vancouver:

Xue Z. Contsruction and performance of chemically and mechanically stabilized granular road test sections. [Internet] [Thesis]. Iowa State University; 2020. [cited 2021 Apr 11]. Available from: https://lib.dr.iastate.edu/etd/18430.

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

Council of Science Editors:

Xue Z. Contsruction and performance of chemically and mechanically stabilized granular road test sections. [Thesis]. Iowa State University; 2020. Available from: https://lib.dr.iastate.edu/etd/18430

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

Virginia Tech

19. Dunlap, Myles Derrick. Experimental Measurement of the Utricle's Dynamic Response and the Mechanoelectrical Characterization of a Micron-Sized DIB.

Degree: PhD, Biomedical Engineering, 2013, Virginia Tech

URL: http://hdl.handle.net/10919/52862

► Within the vestibular system are otolith organs, both the utricle and saccule. The primary function of these organs is to transduce linear head accelerations and… (more)

▼ Within the vestibular system are otolith organs, both the utricle and saccule. The primary function of these organs is to transduce linear head accelerations and static head tilts into afferent signals that are sent to the central nervous system for the utilization of image fixation, muscle posture control, and the coordination of musculoskeletal movement in dynamic body motion. The utricle of the red ear slider turtle was studied in this dissertation. The turtle's utricle is composed of several layers. The base layer contains a set of neural receptor cells, called hair cells, and supporting cells. The three layers above the base layer compose the utricle's otoconial membrane (OM) and are: 1.) a saccharide gelatinous layer, 2.) a column filament layer, and 3.) a calcite and aragonite otoconial crystal layer. The primary goal of this research was to study the dynamic response of the turtle's OM to a variety of natural inertial stimuli in order to characterize its inherent mechanical properties of natural frequency ("n), damping ("), and shear modulus (G). The medial-lateral (ML) and anterior-posterior (AP) anatomical axes parameters were measured for the utricle. The ML axis median with 95% confidence intervals was found to be "n = 374 (353, 396) Hz, " = 0.50 (0.47, 0.53), and G = 9.42 (8.36, 10.49) Pa. The AP axis median with 95% confidence intervals was found to be "n = 409 (390, 430) Hz, " = 0.53 (0.48, 0.57), and G = 11.31 (10.21, 12.41). Nonlinearites were not found to occur in the OM for the tested inertial stimuli and no significant difference was found between the mechanical properties for the ML and AP axes. Additionally, this research presents the initial steps to form a novel bio-inspired accelerometer based on the morphology of the utricle. The primary transducer element for this possible otolith organ inspired accelerometer design is a droplet interface bilayer (DIB). A DIB is a lipid bilayer that is formed when the interface of two aqueous droplets, that contain free-floating lipids, are joined. The aqueous droplets are suspended in a nonpolar environment (oil) and the oil/water interface forms a lipid monolayer. This research developed and used an experimental test setup to characterize the mechanoelectrical characteristics of a micron-sized DIB. This information, along with examples in the text, could be used to further design the aforementioned accelerometer. Advisors/Committee Members: Grant, John W. (committeechair), Wicks, Alfred L. (committee member), Wyatt, Chris L. (committee member), Gabler, Hampton Clay (committee member), Peterson, Ellengene H. (committee member), Leo, Donald J. (committee member).

Subjects/Keywords: utricle; dynamic response; shear modulus; bilayer lipid membrane; DIB

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APA (6^th Edition):

Dunlap, M. D. (2013). Experimental Measurement of the Utricle's Dynamic Response and the Mechanoelectrical Characterization of a Micron-Sized DIB. (Doctoral Dissertation). Virginia Tech. Retrieved from http://hdl.handle.net/10919/52862

Chicago Manual of Style (16^th Edition):

Dunlap, Myles Derrick. “Experimental Measurement of the Utricle's Dynamic Response and the Mechanoelectrical Characterization of a Micron-Sized DIB.” 2013. Doctoral Dissertation, Virginia Tech. Accessed April 11, 2021. http://hdl.handle.net/10919/52862.

MLA Handbook (7^th Edition):

Dunlap, Myles Derrick. “Experimental Measurement of the Utricle's Dynamic Response and the Mechanoelectrical Characterization of a Micron-Sized DIB.” 2013. Web. 11 Apr 2021.

Vancouver:

Dunlap MD. Experimental Measurement of the Utricle's Dynamic Response and the Mechanoelectrical Characterization of a Micron-Sized DIB. [Internet] [Doctoral dissertation]. Virginia Tech; 2013. [cited 2021 Apr 11]. Available from: http://hdl.handle.net/10919/52862.

Council of Science Editors:

Dunlap MD. Experimental Measurement of the Utricle's Dynamic Response and the Mechanoelectrical Characterization of a Micron-Sized DIB. [Doctoral Dissertation]. Virginia Tech; 2013. Available from: http://hdl.handle.net/10919/52862

20. Le, Khoa Ngoc. A Direct Simple Shear Device for the Dynamic Characterization of Partially Saturated Soils.

Degree: MS, 2016, University of New Hampshire

URL: https://scholars.unh.edu/thesis/1082

► The importance of unsaturated soil mechanics has become of interest in recent decades to the geotechnical community. Previous investigations have led to the conclusion that… (more)

Subjects/Keywords: Direct Simple Shear; Dynamic Properties; Medium Shear Strains; Partially Saturated Soils; Shear Modulus; Unsaturated Soils; Civil engineering

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

APA (6^th Edition):

Le, K. N. (2016). A Direct Simple Shear Device for the Dynamic Characterization of Partially Saturated Soils. (Thesis). University of New Hampshire. Retrieved from https://scholars.unh.edu/thesis/1082

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):

Le, Khoa Ngoc. “A Direct Simple Shear Device for the Dynamic Characterization of Partially Saturated Soils.” 2016. Thesis, University of New Hampshire. Accessed April 11, 2021. https://scholars.unh.edu/thesis/1082.

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

MLA Handbook (7^th Edition):

Le, Khoa Ngoc. “A Direct Simple Shear Device for the Dynamic Characterization of Partially Saturated Soils.” 2016. Web. 11 Apr 2021.

Vancouver:

Le KN. A Direct Simple Shear Device for the Dynamic Characterization of Partially Saturated Soils. [Internet] [Thesis]. University of New Hampshire; 2016. [cited 2021 Apr 11]. Available from: https://scholars.unh.edu/thesis/1082.

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

Council of Science Editors:

Le KN. A Direct Simple Shear Device for the Dynamic Characterization of Partially Saturated Soils. [Thesis]. University of New Hampshire; 2016. Available from: https://scholars.unh.edu/thesis/1082

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

University of Western Ontario

21. Ahmad, Saeed. Piezoelectric Device for Measuring Shear Wave Velocity of Soils and Evaluation of Low and High Strain Shear Modulus.

Degree: 2016, University of Western Ontario

URL: https://ir.lib.uwo.ca/etd/3490

► The shear wave velocity (Vs) and shear modulus (G) are important parameters that are required when dealing with a variety of geotechnical problems covering a… (more)

▼ The shear wave velocity (Vs) and shear modulus (G) are important parameters that are required when dealing with a variety of geotechnical problems covering a wide range of shear strain in a soil medium. Different laboratory tests can be used to measure Vs and G such as resonant column, bender element and cyclic triaxial tests. However, these tests have several limitations in terms of stiffness of the test specimens and range of shear strain that can be applied to them. The importance of Vs in geotechnical engineering and the shortcomings of existing testing devices for its measurement have motivated this research. Innovative piezoelectric ring actuators (PRA) devices were fabricated and were incorporated in oedometer and triaxial apparatuses to measure Vs for different types of soils. The PRA device incorporated in a conventional oedometer apparatus facilitated measuring Vs simultaneously with 1D consolidation testing of sand and clays. The performance of the developed PRA setup was evaluated and verified through comparing measured Vs of Ottawa sand with results available in the literature and those obtained from bender element testing. Effects of initial state/void ratio, applied pressure, mean particle size, along with percentage of non-plastic fines on Vs of Ottawa sand were investigated using the PRA setup. Cohesive soils (natural and reconstituted) were tested in oedometer and static triaxial tests. The results from oedometer, static triaxial along with Vs measurements were utilized to produce useful correlations for Vs with some standard soil parameters such as soil compressibility index, Cc, and undrained shear strength, Su. In addition, the measured small strain stiffness (Edynamic), large strain static triaxial stiffness (Estatic) and oedometric stiffness (Eoedometer) were used to establish the range of dynamic to static stiffness ratios Edynamic/Eoedometer, and Edynamic/Estatic. The PRA device incorporated in the cyclic triaxial apparatus was employed to test six different sensitive and in-sensitive cohesive soils. Vs and G were measured using the cyclic triaxial test and the PRA device at different strain amplitudes. The results were utilized to produce dimensionless correlations for Vs and G for cohesive soils. The measured Vs using the PRA device incorporated in a conventional triaxial apparatus along with the developed correlations can then be utilized to reliably estimate the shear modulus reduction curve of cohesive soils without performing cyclic triaxial tests.

Subjects/Keywords: Piezoelectric ring actuators; shear wave velocity; low-strain shear modulus; dynamic shear modulus; stiffness; oedometer; cyclic triaxial; static triaxial; cohesive soils; sands; empirical correlations.; Engineering

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

APA (6^th Edition):

Ahmad, S. (2016). Piezoelectric Device for Measuring Shear Wave Velocity of Soils and Evaluation of Low and High Strain Shear Modulus. (Thesis). University of Western Ontario. Retrieved from https://ir.lib.uwo.ca/etd/3490

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):

Ahmad, Saeed. “Piezoelectric Device for Measuring Shear Wave Velocity of Soils and Evaluation of Low and High Strain Shear Modulus.” 2016. Thesis, University of Western Ontario. Accessed April 11, 2021. https://ir.lib.uwo.ca/etd/3490.

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

MLA Handbook (7^th Edition):

Ahmad, Saeed. “Piezoelectric Device for Measuring Shear Wave Velocity of Soils and Evaluation of Low and High Strain Shear Modulus.” 2016. Web. 11 Apr 2021.

Vancouver:

Ahmad S. Piezoelectric Device for Measuring Shear Wave Velocity of Soils and Evaluation of Low and High Strain Shear Modulus. [Internet] [Thesis]. University of Western Ontario; 2016. [cited 2021 Apr 11]. Available from: https://ir.lib.uwo.ca/etd/3490.

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

Council of Science Editors:

Ahmad S. Piezoelectric Device for Measuring Shear Wave Velocity of Soils and Evaluation of Low and High Strain Shear Modulus. [Thesis]. University of Western Ontario; 2016. Available from: https://ir.lib.uwo.ca/etd/3490

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

RMIT University

22. Radman, A. Bi-directional evolutionary structural optimization (BESO) for topology optimization of material’s microstructure.

Degree: 2013, RMIT University

URL: http://researchbank.rmit.edu.au/view/rmit:160623

► It is known that composite materials with improved properties can be achieved through modifications to the topology of their microstructures. Structural topology optimization approaches can… (more)

▼ It is known that composite materials with improved properties can be achieved through modifications to the topology of their microstructures. Structural topology optimization approaches can be utilized as a systematic way for finding the best spatial distribution of constituent phases within the microstructures of materials/composites. This study presents a new approach for designing material’s microstructures based on the Bi-directional Evolutionary Structural Optimization (BESO) methodology. It is assumed that the materials/composites are composed of repeating microstructures known as periodic base cells (PBC). The goal is to find the best spatial distribution of constituent phases within the PBC, in such a way that materials with desired or improved functional properties are achieved. To this end, the Homogenization theory is applied to establish a relationship between properties of materials microstructure and their macroscopic characteristics. As the first step of this study, the optimization problem is formulated to find microstructures for materials with maximum stiffness, in the form of bulk or shear modulus, or thermal conductivity. Cellular materials, which are composed of one solid phase and one void phase, are considered at this stage. By conducting finite element analysis of the PBC, and applying the Homogenization theory, elemental sensitivity numbers are derived. By gradual removing and adding elements in an iterative process, the optimal topology of the solid phase within the PBC is found. In the next stage of this study, the aim is to combine additional performance constraint to the above procedure. Maximization of bulk or shear modulus is selected as the objective of the material design, subject to the constraint on the isotropy of material and volume constraint. The methodology is extended into topology optimization of microstructures for composites of two or more non-zero constituent phases. For design of material with maximum stiffness or thermal conductivity, the constituent phases are divided into groups and sensitivity analysis is performed between different groups. The developed methodology is also applied in designing functionally graded material (FGM), in which the mechanical property of material gradually changes. It is assumed that the microstructure of the FGM is composed of a series of cellular base cells in the direction of gradation and self-repeated in other directions. Finally, an approach is proposed for the topological design of FGMs with two non-zero constituent phases and multi graded properties. The objective of optimization is defined to find the stiffest materials with prescribed gradation of thermal conductivity. Similar to the approach used for cellular FGMs, the connectivity of base cells is maintained by considering three base cells at each stage. The effectiveness and computational efficiency of the proposed approaches are numerically tested, through designing a range of 2D and 3D microstructures for materials. A series of new and interesting microstructures of…

Subjects/Keywords: Fields of Research; Topology optimization; bulk modulus; shear modulus; thermal conductivity; homogenization; isotropic materials; functionally graded materials

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

APA (6^th Edition):

Radman, A. (2013). Bi-directional evolutionary structural optimization (BESO) for topology optimization of material’s microstructure. (Thesis). RMIT University. Retrieved from http://researchbank.rmit.edu.au/view/rmit:160623

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):

Radman, A. “Bi-directional evolutionary structural optimization (BESO) for topology optimization of material’s microstructure.” 2013. Thesis, RMIT University. Accessed April 11, 2021. http://researchbank.rmit.edu.au/view/rmit:160623.

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

MLA Handbook (7^th Edition):

Radman, A. “Bi-directional evolutionary structural optimization (BESO) for topology optimization of material’s microstructure.” 2013. Web. 11 Apr 2021.

Vancouver:

Radman A. Bi-directional evolutionary structural optimization (BESO) for topology optimization of material’s microstructure. [Internet] [Thesis]. RMIT University; 2013. [cited 2021 Apr 11]. Available from: http://researchbank.rmit.edu.au/view/rmit:160623.

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

Council of Science Editors:

Radman A. Bi-directional evolutionary structural optimization (BESO) for topology optimization of material’s microstructure. [Thesis]. RMIT University; 2013. Available from: http://researchbank.rmit.edu.au/view/rmit:160623

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

Penn State University

23. Sadeghi, Seyedali. EVALUATION OF MUSCLE FUNCTION AND PATHOLOGIES USING ULTRASOUND SHEAR WAVE ELASTOGRAPHY.

Degree: 2019, Penn State University

URL: https://submit-etda.libraries.psu.edu/catalog/16913sus653

► Several pathologies of the musculoskeletal system affect muscle force production. Current techniques for measuring muscle function such as surface electromyography and dynamometry may offer information… (more)

▼ Several pathologies of the musculoskeletal system affect muscle force production. Current techniques for measuring muscle function such as surface electromyography and dynamometry may offer information about global muscle function, but have limitations quantifying localized muscle force from individual muscles. Ultrasound shear wave elastography (SWE) is a promising technique for measurement of shear modulus in soft tissues. Changes in shear modulus are linearly proportional to the force produced by muscles, which allows evaluation of function from individual muscles. Therefore, accurate assessment of muscle shear modulus can enable looking at several musculoskeletal pathologies from an entirely new perspective. The overall goal of this thesis is to develop the ultrasound SWE-based protocol for evaluation of muscle function (force production) for two important diseases: low-back pain and compartment syndrome (CS). Specifically, the multifidus muscle is severely affected in patients with low-back pain, and it is injured in common surgical procedures like posterior lumbar fusion (PLF) and radiofrequency neurotomy (RFN). Compartment syndrome is a pathology caused by stiff muscle fascia where intramuscular pressure abnormally elevates causing pain and in some cases permanent damage to the nerves or muscle necrosis. We developed and evaluated a protocol to quantify muscle force production of the multifidus muscle using ultrasound SWE. Reliability was evaluated in healthy individuals, and preliminary evaluation of multifidus dysfunction was performed patients with a history of PLF and RFN. Second, a new SWE-based protocol is introduced to quantify changes in lower-leg compartment shear modulus after running and muscle fascia for diagnosis of CS. The results of this study suggest that PLF and RFN cause reductions in the force production of multifidus muscles as expected. However, the patterns of multifidus dysfunction were different between PLF and RFN patients. A moderate increase in multifidus shear modulus from lying prone to sitting up and from sitting up to sitting up with lifted arms posture was observed in PLF patients, while the shear modulus remained relatively constant in RFN patients. These findings indicate that our proposed protocol provides detailed information about the severity and contraction patterns of this muscle. On the other hand, our work on CS showed initial evidence of the temporal changes in shear modulus of lower-leg muscles after a running exercise using SWE, a dependency of shear modulus and intramuscular pressure, and a way to accurately calculate the stiffness of muscle fascia. Overall, these protocols can potentially be used for the diagnosis of CS and assessing individual spine muscles in response to post-surgical rehabilitation protocols. Advisors/Committee Members: Daniel Humberto Cortes Correales, Dissertation Advisor/Co-Advisor, Daniel Humberto Cortes Correales, Committee Chair/Co-Chair, Jason Zachary Moore, Committee Member, Stephen Jacob Piazza, Committee Member, Meghan Elise Vidt, Outside Member.

Subjects/Keywords: Ultrasound shear wave elastography; muscle force production; posterior lumbar fusion; radiofrequency neurotomy; compartment syndrome; shear modulus

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

APA (6^th Edition):

Sadeghi, S. (2019). EVALUATION OF MUSCLE FUNCTION AND PATHOLOGIES USING ULTRASOUND SHEAR WAVE ELASTOGRAPHY. (Thesis). Penn State University. Retrieved from https://submit-etda.libraries.psu.edu/catalog/16913sus653

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):

Sadeghi, Seyedali. “EVALUATION OF MUSCLE FUNCTION AND PATHOLOGIES USING ULTRASOUND SHEAR WAVE ELASTOGRAPHY.” 2019. Thesis, Penn State University. Accessed April 11, 2021. https://submit-etda.libraries.psu.edu/catalog/16913sus653.

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

MLA Handbook (7^th Edition):

Sadeghi, Seyedali. “EVALUATION OF MUSCLE FUNCTION AND PATHOLOGIES USING ULTRASOUND SHEAR WAVE ELASTOGRAPHY.” 2019. Web. 11 Apr 2021.

Vancouver:

Sadeghi S. EVALUATION OF MUSCLE FUNCTION AND PATHOLOGIES USING ULTRASOUND SHEAR WAVE ELASTOGRAPHY. [Internet] [Thesis]. Penn State University; 2019. [cited 2021 Apr 11]. Available from: https://submit-etda.libraries.psu.edu/catalog/16913sus653.

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

Council of Science Editors:

Sadeghi S. EVALUATION OF MUSCLE FUNCTION AND PATHOLOGIES USING ULTRASOUND SHEAR WAVE ELASTOGRAPHY. [Thesis]. Penn State University; 2019. Available from: https://submit-etda.libraries.psu.edu/catalog/16913sus653

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

Brigham Young University

24. Kinney, Landon Scott. Pore Pressure Generation and Shear Modulus Degradation during Laminar Shear Box Testing with Prefabricated Vertical Drains.

Degree: MS, 2018, Brigham Young University

URL: https://scholarsarchive.byu.edu/cgi/viewcontent.cgi?article=8709&context=etd

► Liquefaction is a costly phenomenon where soil shear modulus degrades as the generation of excess pore pressures begins. One of the methods to mitigate liquefaction,… (more)

▼ Liquefaction is a costly phenomenon where soil shear modulus degrades as the generation of excess pore pressures begins. One of the methods to mitigate liquefaction, is the use of prefabricated vertical drains. Prefabricated vertical drains provide a drainage path to effectively mitigate the generation of pore pressures and aid in shear modulus recovery. The aims of this study were to define shear modulus degradation vs. shear strain as a function of excess pore pressure ratio; define the effects of prefabricated vertical drains on the behavior of pore pressure generation vs. shear strain; and to define volumetric strain as a function of shear strain and excess pore pressure ratios. A large-scale laminar shear box test was conducted and measured on clean sands with prefabricated vertical drains spaced at 3-feet and 4-feet. The resulting test data was analyzed and compared to data without vertical drains. The results show the effect of increasing excess pore pressure ratios on shear modulus and curves where developed to encompass these effects in design with computer programing like SHAKE or DEEPSOIL. The data also suggests that prefabricated vertical drains effectively mitigate excess pore pressure build-up, thus increased the shear strain resistance before pore pressures were generated. Regarding volumetric strain, the results suggests that the primary factor governing the measured settlement is the excess pore pressure ratio. This indicates that if the drains can reduce the excess pore pressure ratio, then the resulting settlement can successfully be reduced during a shaking event. The curves for shear modulus vs. cyclic shear strain as function of pore pressure ratio were developed using data with high strain and small strain which leaves a gap of data in the cyclic shear strain range of 0.0001 to 0.01. Further large-scale testing with appropriate sensitivity is needed to observe the effect excess pore pressure generation on intermediate levels of cyclic shear strain.

Subjects/Keywords: Landon S. Kinney; Kyle M. Rollins; shear modulus; pore pressure ratio; prefabricated vertical drains; volumetric strain; cyclic shear strain; Engineering

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

APA (6^th Edition):

Kinney, L. S. (2018). Pore Pressure Generation and Shear Modulus Degradation during Laminar Shear Box Testing with Prefabricated Vertical Drains. (Masters Thesis). Brigham Young University. Retrieved from https://scholarsarchive.byu.edu/cgi/viewcontent.cgi?article=8709&context=etd

Chicago Manual of Style (16^th Edition):

Kinney, Landon Scott. “Pore Pressure Generation and Shear Modulus Degradation during Laminar Shear Box Testing with Prefabricated Vertical Drains.” 2018. Masters Thesis, Brigham Young University. Accessed April 11, 2021. https://scholarsarchive.byu.edu/cgi/viewcontent.cgi?article=8709&context=etd.

MLA Handbook (7^th Edition):

Kinney, Landon Scott. “Pore Pressure Generation and Shear Modulus Degradation during Laminar Shear Box Testing with Prefabricated Vertical Drains.” 2018. Web. 11 Apr 2021.

Vancouver:

Kinney LS. Pore Pressure Generation and Shear Modulus Degradation during Laminar Shear Box Testing with Prefabricated Vertical Drains. [Internet] [Masters thesis]. Brigham Young University; 2018. [cited 2021 Apr 11]. Available from: https://scholarsarchive.byu.edu/cgi/viewcontent.cgi?article=8709&context=etd.

Council of Science Editors:

Kinney LS. Pore Pressure Generation and Shear Modulus Degradation during Laminar Shear Box Testing with Prefabricated Vertical Drains. [Masters Thesis]. Brigham Young University; 2018. Available from: https://scholarsarchive.byu.edu/cgi/viewcontent.cgi?article=8709&context=etd

University of Kentucky

25. Walton-Macaulay, Corrie. PREDICTION OF STRENGTH AND SHEAR MODULUS OF COMPACTED CLAYS WITHIN AN UNSATURATED CRITICAL STATE FRAMEWORK.

Degree: 2015, University of Kentucky

URL: https://uknowledge.uky.edu/ce_etds/28

► The objective of this research study is to determine whether the soil stiffness, from which the small-strain shear modulus is determined, can be used to… (more)

Subjects/Keywords: Unsaturated Soil Mechanics; Compacted Clay; Soil-Water Characteristic Curve; Shear Modulus; Soil Stiffness; Shear Strength.; Civil Engineering; Geotechnical Engineering

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

APA (6^th Edition):

Walton-Macaulay, C. (2015). PREDICTION OF STRENGTH AND SHEAR MODULUS OF COMPACTED CLAYS WITHIN AN UNSATURATED CRITICAL STATE FRAMEWORK. (Doctoral Dissertation). University of Kentucky. Retrieved from https://uknowledge.uky.edu/ce_etds/28

Chicago Manual of Style (16^th Edition):

Walton-Macaulay, Corrie. “PREDICTION OF STRENGTH AND SHEAR MODULUS OF COMPACTED CLAYS WITHIN AN UNSATURATED CRITICAL STATE FRAMEWORK.” 2015. Doctoral Dissertation, University of Kentucky. Accessed April 11, 2021. https://uknowledge.uky.edu/ce_etds/28.

MLA Handbook (7^th Edition):

Walton-Macaulay, Corrie. “PREDICTION OF STRENGTH AND SHEAR MODULUS OF COMPACTED CLAYS WITHIN AN UNSATURATED CRITICAL STATE FRAMEWORK.” 2015. Web. 11 Apr 2021.

Vancouver:

Walton-Macaulay C. PREDICTION OF STRENGTH AND SHEAR MODULUS OF COMPACTED CLAYS WITHIN AN UNSATURATED CRITICAL STATE FRAMEWORK. [Internet] [Doctoral dissertation]. University of Kentucky; 2015. [cited 2021 Apr 11]. Available from: https://uknowledge.uky.edu/ce_etds/28.

Council of Science Editors:

Walton-Macaulay C. PREDICTION OF STRENGTH AND SHEAR MODULUS OF COMPACTED CLAYS WITHIN AN UNSATURATED CRITICAL STATE FRAMEWORK. [Doctoral Dissertation]. University of Kentucky; 2015. Available from: https://uknowledge.uky.edu/ce_etds/28

Colorado School of Mines

26. Rodrigues, Patricia Evelyn. Shear modulus of heavy oils, rheometer measurements: confinement effect and amplitude dependence.

Degree: PhD, Geophysics, 2014, Colorado School of Mines

URL: http://hdl.handle.net/11124/413

► The success of seismic and other acoustic monitoring techniques is based on the ability of geophysicists to accurately model acoustic waves propagation. True "fluids" are… (more)

▼ The success of seismic and other acoustic monitoring techniques is based on the ability of geophysicists to accurately model acoustic waves propagation. True "fluids" are not capable of supporting shear stress; however, heavy oils are viscoelastic and allow the transmission of shear waves. The shear modulus of heavy oils is highly dependent on frequency which adds a major difficulty since the data we study are obtained at different frequencies. Measuring elastic properties at high frequencies has been done for many years and it is much simpler than low frequencies measurements; specifically in bulk heavy oils. The equipment deforms the sample at frequencies from 3 to 3000 Hz and it works well for solid-like samples but cannot be used for liquid-like samples. An alternative method to measure the shear modulus of heavy oils at low frequencies is the rheometer which measures the shear modulus at frequencies from 0.01 to 100 Hz with strains amplitudes in the order of 10-4, two or three orders of magnitude larger than tension/compression. Linear viscoelasticity theory indicates that measurements done in the linear viscoelastic regime should be consistent between techniques as elastic properties are independent of amplitude. My research is focused on understanding rheometer measurements, and validating them against the tension/compression technique. However, in this work I identified two aspects of the rheometer that make their measurements not consistent with tension/compression results. The first is the presence of the two solid-liquid interfaces provided by the parallel plates; and the second is the increased strains amplitudes in the rheometer. The solid-liquid interfaces cause reorientation of the surface active components of the heavy oils, increasing the shear modulus near the interface in a scale that can be measured by the rheometer. This was evidenced by an increased of the shear modulus when reducing the gap between the rheometer plates. On the other hand, the increased amplitudes on the rheometer cause decrease in the shear modulus with respect to what is measured in seismic techniques. Heavy oils are aggregates that at rest or under low shear, behave as a solid due to weak bonds between the aggregate particles. As strain amplitude is increased the weaker bonds are broken and the heavy oil behaves liquid-like. This was seen by the increased values measured by the tension/compression results at low amplitudes in comparison to the much lower values measured by the rheometer at higher amplitudes. This indicates that two linear viscoelastic regimes can be present in the heavy oil at different amplitudes. The main two implications of this work are the fact that under confinement heavy oils properties change and the shear modulus and viscosity increases affecting not only the measurements but also the flow in porous media where heavy oils are confined between grains. On the other hand, the use of the rheometer for seismic or acoustic applications is limited as the higher strain of the rheometer can measure values… Advisors/Committee Members: Batzle, Michael L. (advisor), Prasad, Manika (committee member), Li, Yaoguo (committee member), Sava, Paul C. (committee member), Yang, Yuan (committee member), Merkel, Richard (committee member).

Subjects/Keywords: confinement; heavy oils; amplitude dependence; shear modulus; Heavy oil – Elastic properties – Measurement; Shear waves; Elastic wave propagation; Rheometers; Viscoelasticity

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

APA (6^th Edition):

Rodrigues, P. E. (2014). Shear modulus of heavy oils, rheometer measurements: confinement effect and amplitude dependence. (Doctoral Dissertation). Colorado School of Mines. Retrieved from http://hdl.handle.net/11124/413

Chicago Manual of Style (16^th Edition):

Rodrigues, Patricia Evelyn. “Shear modulus of heavy oils, rheometer measurements: confinement effect and amplitude dependence.” 2014. Doctoral Dissertation, Colorado School of Mines. Accessed April 11, 2021. http://hdl.handle.net/11124/413.

MLA Handbook (7^th Edition):

Rodrigues, Patricia Evelyn. “Shear modulus of heavy oils, rheometer measurements: confinement effect and amplitude dependence.” 2014. Web. 11 Apr 2021.

Vancouver:

Rodrigues PE. Shear modulus of heavy oils, rheometer measurements: confinement effect and amplitude dependence. [Internet] [Doctoral dissertation]. Colorado School of Mines; 2014. [cited 2021 Apr 11]. Available from: http://hdl.handle.net/11124/413.

Council of Science Editors:

Rodrigues PE. Shear modulus of heavy oils, rheometer measurements: confinement effect and amplitude dependence. [Doctoral Dissertation]. Colorado School of Mines; 2014. Available from: http://hdl.handle.net/11124/413

27. Landrus, Daniel David. Effect Of Nanoclay On Binder Rheology And HMA Rutting Resistance.

Degree: MS, Civil Engineering, 2016, University of North Dakota

URL: https://commons.und.edu/theses/1916

► In this study, the change in rheological properties of nanoclay modified asphalt binders was determined in the laboratory. The four performance grade asphalt binders… (more)

Subjects/Keywords: Asphalt Pavement Analyzer; Complex Modulus; Dynamic Shear Rheometer; Nanoclay; Rheology; Rutting Resistance

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

APA (6^th Edition):

Landrus, D. D. (2016). Effect Of Nanoclay On Binder Rheology And HMA Rutting Resistance. (Masters Thesis). University of North Dakota. Retrieved from https://commons.und.edu/theses/1916

Chicago Manual of Style (16^th Edition):

Landrus, Daniel David. “Effect Of Nanoclay On Binder Rheology And HMA Rutting Resistance.” 2016. Masters Thesis, University of North Dakota. Accessed April 11, 2021. https://commons.und.edu/theses/1916.

MLA Handbook (7^th Edition):

Landrus, Daniel David. “Effect Of Nanoclay On Binder Rheology And HMA Rutting Resistance.” 2016. Web. 11 Apr 2021.

Vancouver:

Landrus DD. Effect Of Nanoclay On Binder Rheology And HMA Rutting Resistance. [Internet] [Masters thesis]. University of North Dakota; 2016. [cited 2021 Apr 11]. Available from: https://commons.und.edu/theses/1916.

Council of Science Editors:

Landrus DD. Effect Of Nanoclay On Binder Rheology And HMA Rutting Resistance. [Masters Thesis]. University of North Dakota; 2016. Available from: https://commons.und.edu/theses/1916

University of Notre Dame

28. Luling Yang. Shear Stiffness Modeling of Cemented Sand</h1>.

Degree: Civil Engineering and Geological Sciences, 2007, University of Notre Dame

URL: https://curate.nd.edu/show/f4752f77x2v

► Nonlinear site response analyses can provide more accurate predictions of ground motions during an earthquake than equivalent linear procedures, especially for higher amplitude ground… (more)

Subjects/Keywords: cemented sand; shear modulus; damping; modeling

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APA (6^th Edition):

Yang, L. (2007). Shear Stiffness Modeling of Cemented Sand</h1>. (Thesis). University of Notre Dame. Retrieved from https://curate.nd.edu/show/f4752f77x2v

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):

Yang, Luling. “Shear Stiffness Modeling of Cemented Sand</h1>.” 2007. Thesis, University of Notre Dame. Accessed April 11, 2021. https://curate.nd.edu/show/f4752f77x2v.

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

MLA Handbook (7^th Edition):

Yang, Luling. “Shear Stiffness Modeling of Cemented Sand</h1>.” 2007. Web. 11 Apr 2021.

Vancouver:

Yang L. Shear Stiffness Modeling of Cemented Sand</h1>. [Internet] [Thesis]. University of Notre Dame; 2007. [cited 2021 Apr 11]. Available from: https://curate.nd.edu/show/f4752f77x2v.

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

Council of Science Editors:

Yang L. Shear Stiffness Modeling of Cemented Sand</h1>. [Thesis]. University of Notre Dame; 2007. Available from: https://curate.nd.edu/show/f4752f77x2v

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

Arizona State University

29. Evans, Ashley Elizabeth. Estimation of Pressuremeter Modulus From Shear Wave Velocity In the Sonoran Desert.

Degree: Civil, Environmental and Sustainable Engineering, 2018, Arizona State University

URL: http://repository.asu.edu/items/50498

► Laterally-loaded short rigid drilled shaft foundations are the primary foundation used within the electric power transmission line industry. Performance of these laterally loaded foundations is… (more)

Subjects/Keywords: Civil engineering; degradation factor; pressuremeter modulus; shear wave velocity; unsaturated soil mechanics

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

APA (6^th Edition):

Evans, A. E. (2018). Estimation of Pressuremeter Modulus From Shear Wave Velocity In the Sonoran Desert. (Doctoral Dissertation). Arizona State University. Retrieved from http://repository.asu.edu/items/50498

Chicago Manual of Style (16^th Edition):

Evans, Ashley Elizabeth. “Estimation of Pressuremeter Modulus From Shear Wave Velocity In the Sonoran Desert.” 2018. Doctoral Dissertation, Arizona State University. Accessed April 11, 2021. http://repository.asu.edu/items/50498.

MLA Handbook (7^th Edition):

Evans, Ashley Elizabeth. “Estimation of Pressuremeter Modulus From Shear Wave Velocity In the Sonoran Desert.” 2018. Web. 11 Apr 2021.

Vancouver:

Evans AE. Estimation of Pressuremeter Modulus From Shear Wave Velocity In the Sonoran Desert. [Internet] [Doctoral dissertation]. Arizona State University; 2018. [cited 2021 Apr 11]. Available from: http://repository.asu.edu/items/50498.

Council of Science Editors:

Evans AE. Estimation of Pressuremeter Modulus From Shear Wave Velocity In the Sonoran Desert. [Doctoral Dissertation]. Arizona State University; 2018. Available from: http://repository.asu.edu/items/50498

University of Waterloo

30. Trinidad, Ephraim. Evaluation of Hybrid Electrically Conductive Adhesives.

Degree: 2016, University of Waterloo

URL: http://hdl.handle.net/10012/10991

► An electrically conductive adhesive (ECA) is a composite material acting as a conductive paste, which consists of a thermoset loaded with conductive fillers (typically silver… (more)

▼ An electrically conductive adhesive (ECA) is a composite material acting as a conductive paste, which consists of a thermoset loaded with conductive fillers (typically silver (Ag)). Many works that focus on this line of research were successful at making strides to improve its main weakness of low electrical conductivity. Most research focused on developing better silver fillers and co-fillers, or utilizing conductive polymers to improve its electrical conductivity, however, most of these works are carried out on small scale. In this work, we aim to produce larger quantities of hybrid ECA to successfully test its properties. Industry is interested in materials with superior physical properties. As such, rheological behavior and mechanical strength were explored as it has been theoretically hinted that incorporation of exfoliated graphene within the composite could impact those factors listed in a positive manner. In the first step of this project, pre-treated sodium dodecyl sulfate (SDS)-decorated graphene’s rheological properties were examined. An epoxy resin diglycidylether of bisphenol-A (DGEBA) was the main polymer used for this study: a well-known material that can behave either as a shear-thinning or shear-thickening material depending on the supplier. We showed how composites that contain graphene (Gr) had higher viscosities than ones that contained SDS decorated graphene Gr(s). Not only did we confirm that surfactant was a key factor in the decrease of viscosity, but we also report how Gr and Gr(s) had a special effect that suppresses the intrinsic shear thickening behavior of epoxy resin at weight concentrations (wt%) higher than 0.5 wt%. The results showed that Gr(s) is not only beneficial in terms of improving the conductivity of conventional ECAs, but it also acts as a solid lubricant that decreases the viscosity of the composite paste at higher weight concentrations. In the second step of the project, pre-treated SDS decorated graphene’s mechanical properties were examined. In specific, its lap-shear strength (LSS) as well as the effect of residual solvent when present in our hybrid ECA system were studied in order to follow up on the thermal results obtained from a previous study. We showed that our initial suspicion was correct as the LSS did decrease for all of the solvent-assisted formulations that contained Gr(s) ranging from 66 to 84%, however, we were not able to tell whether or not that decrease was caused by lower crosslinking density. Instead, we uncovered another reason for this decrease: bubble formation during the curing step. This suspicion was confirmed qualitatively through light microscopy and quantitatively through optical profilometry, where we present an increase in surface roughness for the solvent-assisted samples. Furthermore, by using SEM, we also confirmed that this bubble formation extends throughout the entire bulk material rather than just at the interface. Lastly, we investigated whether the use of solvent to assist in the mixing process significantly improves the…

Subjects/Keywords: Adhesive; Viscosity; Electrical Conductivity; Lap-Shear Strength; Graphene; Surfactant; PEDOT:PSS; Silver; Composite; Modulus

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

APA (6^th Edition):

Trinidad, E. (2016). Evaluation of Hybrid Electrically Conductive Adhesives. (Thesis). University of Waterloo. Retrieved from http://hdl.handle.net/10012/10991

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):

Trinidad, Ephraim. “Evaluation of Hybrid Electrically Conductive Adhesives.” 2016. Thesis, University of Waterloo. Accessed April 11, 2021. http://hdl.handle.net/10012/10991.

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

MLA Handbook (7^th Edition):

Trinidad, Ephraim. “Evaluation of Hybrid Electrically Conductive Adhesives.” 2016. Web. 11 Apr 2021.

Vancouver:

Trinidad E. Evaluation of Hybrid Electrically Conductive Adhesives. [Internet] [Thesis]. University of Waterloo; 2016. [cited 2021 Apr 11]. Available from: http://hdl.handle.net/10012/10991.

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

Council of Science Editors:

Trinidad E. Evaluation of Hybrid Electrically Conductive Adhesives. [Thesis]. University of Waterloo; 2016. Available from: http://hdl.handle.net/10012/10991

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

Open Access Theses and Dissertations