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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 20 of 434 for “"elastic modulus"”.
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The effect of lattice vacancies on the elastic modulus
The effect of quenched-in vacancies upon the elastic modulus of aluminum ma investigated. Equipment for dynamically measuring the change in elastic modulus was developed for the purpose. It was demonstrated that the presence of lattice vacancies will reduce the elastic modulus. This change in …
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High elastic modulus nanopowder reinforced resin composites for dental applications
… In this thesis, a new family of high elastic modulus nanopowder reinforced resin composites and their mechanical properties are studied. Materials with higher elastic modulus, such as alumina and diamond, are used to replace the routine filler material, silica, in dental resin …
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Genetic Regulation of Retinal Cells by Variation of Underlying Elastic Modulus
A major breakthrough in the development of engineering hydrogels for regenerative medicine occurred when it was noticed that when cells are plated on substrates of different stiffnesses undergo certain conformational changes in their cytoskeleton. Specifically, the tension in cytoskeleton of the …
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Elastic Modulus Effect in the Interaction of Point Defects With Dislocation Ribbons
Made available in DSpace on 2014-12-10T17:57:52Z (GMT). No. of bitstreams: 1 6901445.pdf: 4088954 bytes, checksum: 6fa9bda44e396f3b26236e36f41af3ab (MD5) Previous issue date: 1968
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Tensile strength and elastic modulus of tall fescue (Lolium arundinaceum) grass roots
Submission published under a 24 month embargo labeled 'U of I Access', the embargo will last until 2027-08-01
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Measuring spatially varying elastic modulus of multi-compartment 3D collagen scaffold using indentation
… cell behavior and differentiation. Accurate elastic modulus measurements of theses scaffolds will greatly influence their ability to engineer tissues with varying degrees of stiffness such as tendon-to-bone junctions (TBJ). This thesis presents a novel indentation method as an accurate …
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Mapping of elastic modulus and hardness in Trochus niloticus seashell nacre by nanoindentation
… at maximum loads of 1 mN and 500 gN. The average elastic modulus and hardness for the 1 mN indents were found to be 97.8 GPa + 6.41 GPa and 5.41 GPa ± 0.49 GPa, respectively, and for the 500 gN indents average elastic modulus of 94.8 GPa ± 7.28 GPa and hardness of 4.89 GPa ± 0.53 GPa. Maps of the …
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Adaptation Of The Biodent For Spherical Microindentation To Determine Elastic Modulus In Small Rodent Bones
… standard pointed tip inherently introduces both elastic and plastic deformation into the material. In contrast, indentation with a spherical tip can be operated entirely in the elastic range, providing for a non-damaging test that has significant advantages over sharp indentation techniques. …
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The Effects of Carbon Fiber Misalignment on Composite Material Strength
… can be used to systematically determine the elastic modulus of single ply composites that are subject to an altered manufacturing process. In this approach, the magnitude of specific ultrasonic wave velocities is applied through Chirstoffel's equations to determine the necessary five elastic …
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Analysis of the variation of horizontal stresses and strains in bedded deposits in the eastern and Midwestern United States
… with respect to the site depth and the rock elastic modulus using data from 40 sites. For the development of adequate regression models with the elastic modulus, zones with sufficiently uniform strains must be established. A low strain zone encompassing much of the eastern United States and a …
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Nanomechanical Properties of Polymer-Grafted Nanoparticle Ultrathin Films
… nanoparticles in the polymer matrix enhances the elastic modulus of thin films. However, there’s still a window of opportunity for an intensive study of the process-morphology-property (PMP) relationship for polymer-grafted nanoparticle (PGNP) thin films based on the particle size, loading …
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In vitro evaluation of polymerization energy for bulk fill composites
… the light energy, microhardness (VHN), and elastic modulus across the depth of one conventional and three bulk-fill RBCs. Materials and Methods: Three commercially available bulk-fill RBCs (Tetric EvoCeram Bulk Fill [TE], SonicFill [SF], X-tra fill[XF]) and one conventional RBC (Premise …
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Nanoindentation of Annealed and As-Sputtered Thin Films of Nickel Titanium Shape Memory Alloys
… of the thin film by nanoindentation produced an elastic modulus of the thin film NiTi SMA with the developed processing parameters was 67.9 GPa with a hardness of 2.1 GPa. The measured thin film NiTi elastic modulus was greater than bulk NiTi of 40 GPa because of the residual stress from the …
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Investigation of mechanical properties of copper and aluminum covetics using nanoindentation
… of 0 and 2.3 weight percent as reported by TMM. Elastic modulus, hardness and friction coefficients were measured. In addition, viscoelastic properties such as storage and complex moduli were assessed for all the covetic samples and standard sample. The obtained values were compared with each …
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A finite element study of the effects of residual stress on conical indentation
… study the behavior of an aluminum alloy during elastic-plastic indentation by a rigid conical indenter to determine how the indentation process is affected by residual stress. The study was motivated by recent experimental results which showed that the hardness and elastic modulus of the alloy …
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The Influence of Manufacturing Method and Collagen on the Mechanical Performance of Sodium Alginate-Based Scaffolds for Cartilage Tissue Engineering
… scaffold fabrication significantly decreased the elastic modulus. This study also showed that the addition of collagen and gelatin significantly decreased the elastic modulus by 42% and 31% respectively. Therefore, pure-SA scaffolds exhibited the most favourable properties with a compressive …
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On the relationship between compressional wave velocity of saturated porous rocks and density : theory and application
… V, to the square root of the ratio of the rock's elastic modulus, M, and its density, [rho] (Bourvie et al., 1987). Therefore, the equation indicates that the velocity is inversely proportional to density. However, the in-situ field measurements and laboratory experiments of compressional wave …
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Processing, Microstructural And Mechanical Characterization Of Mechanically Alloyed Al-al2o3 Nanocomposites
… volume fraction on the stress-strain response, elastic modulus and yield strength of the composites was investigated. Nanoindentation and compression tests were performed to characterize the composite material. Yield strength of 515 MPa, compressive strength of 685 MPa and elastic modulus of 36 …
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