Global ETD Search
Search theses and dissertations gathered from participating repositories worldwide. Every result links back to the library that holds it. No account is needed.
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Showing 1 to 16 of 16 for “"Biaxial testing"”.
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Development of a Biaxial Testing System for Research of Soft Tissue Biomechanics using Laboratory Models
… MPa). To this end, we developed a biomechanical testing system that allows us to characterize the material properties of small samples with high accuracy and precision. We built and validated the performance of the instrument’s subsystems (displacement, strain rate, gram-force readings, …
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Mechanical properties of arterial wall
… on human arteries because of the difficulty of testing artery samples often obtained from autopsy while arteries are still considered "fresh". Various solutions mimicking the physiological environment have been used to preserve artery samples from harvesting to testing. In vitro mechanical …
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Instrumentation for multiaxial mechanical testing of inhomogeneous elastic membranes
… and construction of an instrument for biaxial mechanical testing of inhomogeneous elastic membranes. The instrument incorporates an arrangement of linear motion stages for applying arbitrary deformation profiles on the material under test, purpose-built two-axis force transducers for …
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Experimental investigation and constitutive modeling of metallic honeycombs in sandwich structures
… large plastic deformation. In this thesis, a new biaxial testing device has been developed for the reliable characterization of the mechanical behavior of cellular materials. Using this device, the macroscopic phenomenology and the underlying microstructural deformation mechanisms of thin-walled …
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The Design and Construction of a Bulge Testing Device Platform for Human Skin Tissue Applications
Limited standard mechanical testing practises and stress-strain data are available for anisotropic human skin tissue in biaxial loading configurations to suitably represent skin in vivo. Inconsistencies in mechanical and physical properties in the literature due to numerous physiological factors …
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Fundamental and engineering application studies of pressure-assisted injection forging of thick-walled tubular components
… tests was proposed, and particularly, a unique biaxial testing machine was developed and used satisfactorily. The test data were subsequently used to establish constitutive descriptions of the materials and to facilitate the FE modelling to simulate the forming processes. An upper bound analysis …
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Effect of loading history in necking and fracture
… of methods: classical specimens under uniaxial testing, and the newly designed butterfly specimens under biaxial testing. Experimental results on 2024-T351 aluminum alloy, 1045 steel, and A710 steel validated the proposed 3D fracture locus. A concept of forming severity is introduced to study …
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Biaxial Behavior of Ultra-High Performance Concrete and Untreated UHPC Waffle Slab Bridge Deck Design and Testing
… challenges in mixing, placing, and curing UHPC. Biaxial testing was performed to evaluate behavior of UHPC in combined tension and compression stress states. A UHPC bridge deck was designed to perform similarly to a conventional concrete bridge deck, and a single unit bridge deck section was …
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Design and Validation of a Dynamic Pressure-Based Loading Device and 3D Strain Tracking Protocol for Ventral Hernia Modeling
… the chance of recurrence. Commonly used ex vivo testing methods for determining the mechanical properties of the abdominal wall and biomaterials for hernia repair consist primarily of uniaxial and biaxial testing, which are not physiologically relevant loading environments. The need for a testing …
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Mechanical Characterization of Swine Uterosacral and Cardinal Ligaments
… with published active and passive, uniaxial and biaxial, experimental data on pig arteries due to lack of data on the active properties of the USL and CL. Subjected to constant forces in-vivo, the structure and length of the USL and CL are sig- nificantly altered over time. In chapter 3, we …
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Finite element modelling the forming of components for portable electronic devices
… forming process, initial load controlled bulge testing experiments revealed non-linear strain paths in principal directions yielding average and maximum strain rate ranges of 2.5–5 s-1 and 5–18 s-1 respectively, across the forming temperature range of 130–155 ⁰C. Extensive in-plane biaxial …
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Design, build and test of a planar biaxial tensile testing machine for skin and other collagenous soft tissues
… was the design and construction of a planar biaxial tensile testing machine, suitable for ultimately testing skin and other soft membrane tissues. The mechanical properties of skin and other collagenous soft tissues are of interest to a wide range of researchers and professionals. Interests …
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Ex Vivo Deformations of the Uterosacral Ligaments
… vivo}} and {emph{ex vivo}}, uniaxial and biaxial tensile tests are compiled. Based on the existing findings, research gaps are identified and future research directions are discussed. The second chapter proposes the use of planar biaxial testing, digital image correlation (DIC), and …
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Regional Mechanical Properties and Microstructure of Ovine Heart Chambers
… ventricles, atria, and appendages underwent biaxial mechanical testing. A Fung-type strain energy function was used to fit the experimental data. Tissue behavior was quantified based on the magnitude of strain energy, as an indicator of tissue stiffness, at equibiaxial strains of 0.10, 0.15, …
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Tearing of Vaginal Tissue under Biaxial Loading: Implications for Women's Health
… swine and rat vaginal tissue is subjected to biaxial loads until tearing to reveal its mechanical properties. The resulting large inhomogeneous deformations are measured by the digital image correlation optical method to calculate material strain. The influence of these strains near to and far …
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Design of Sandwich Structures
Failure modes for sandwich beams of GFRP laminate skins and Nomex honeycomb core are investigated. Theoretical models using honeycomb mechanics and classical beam theory are described. A failure mode map for loading under 3-point bending, is constructed, showing the dependence of failure mode and …