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 20 of 93 for “"Compression testing"”.
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Development of an intermediate strain rate compression testing machine
… stop the experiment, it takes less than 1 of the testing duration to reach testing speed and to stop the experiment. The kinetic energy stored in the wedge bar helps ensure a near constant loading rate over the duration of the experiment. The yield stress is captured at above 80 of the average …
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Determination of thermo-mechanical variables during plain strain compression testing
Plane strain compression (PSC) resting is a method used to simulate the deformation condition of industrial rolling, namely that of plane strain, and is used extensively to describe the influence of deformation variables, being strain, strain rate and temperature, on microstructural evolution. …
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Development of a constrained piston method for compression testing of carbon foams
… purpose of this study is to develop a standard compression test for gathering mechanical strength properties, namely yield stress, modulus, and energy absorption all during a single compression test. Several carbon foams were tested using both the novel constrained method (developed herein) and …
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Design and construction of a motor-actuated sea ice compression testing machine
… emphasis on developing a specialized sea ice compression testing machine. The machine, designed for harsh sub-zero and saline conditions, would facilitate the immediate testing of ice samples onboard the SA Agulhas II vessel. The research entailed designing and constructing a compression …
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Compression testing and measurement of material properties of a double network hydrogel
… were tested under compressive loads in cyclic compression tests and stress relaxation tests. A viscoelastic model was applied and material properties were calculated using the experimental data. The elastic modulus of these PAAm-alginate gels was found to be 35kPa, while the viscosity, [eta], …
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Experimental Techniques for Shear Testing of Thin Sheet Metals and Compression Testing at Intermediate Strain Rates
… used to characterize Al2024-T351 and Cu-101 in compression at a strain rate of 100(1/s). The proposed intermediate strain rate apparatus consists of a linear hydraulic actuator to generate the loading and a long transmitter bar. The specimen is placed on the end of the transmitter bar and loaded …
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Determining the Mechanical Properties of Lattice Block Structures
… aerospace, military, and transportation. Recent testing at the NASA Glenn Research Center has investigated the material properties of lattice block structures cast from a conventional aerospace titanium alloy as well as lattice block structures cast from nickel-titanium shape memory alloy. The …
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Microstructural And Mechanical Characterization Of Al-al2o3 Nanocomposites Synthesized By High-energy Milling
… then subjected to mechanical characterization by compression testing and nanoindentation techniques. The strength and elastic modulus values obtained from compression testing showed an increase with increasing volume fraction and decreasing particle size of the reinforcement. The nanoindentation …
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Optimizing the synthesis process of wood-derived biomorphic silicon carbide
… (XRD), scanning electron microscopy (SEM) and compression testing. It was found that applying pressure or vacuum produced more effective SiO₂ weight gains. Pine showed superior absorption to other types with its maximum obtained value achieved under vacuum followed by pressure. The starting …
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Compression of thick laminated composite beams with initial impact-like damage
While the study of compression after impact of laminated composites has been under consideration for many years. the complexity of the damage initiated by low velocity impact has not lent itself to simple predictive models for compression strength. The damage modes due to non-penetrating. low …
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Compression behavior of smectitic vs. illitic mudrocks
… in pore pressure. This thesis investigates the compression and permeability behavior change due to S-I transformation. Uniaxial compression testing was performed on smectitic and illitic mudrocks. The original Gulf of Mexico - Eugene Island (GoM-EI) mudrock sets the baseline for smectitic …
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Characterization of damage mechanisms and behavior in two-dimensionally braided composites subjected to static and fatigue loading
… to the axial fiber bundles. Static tension and compression testing was completed first to determine material strengths and basic damage modes for each of the architectures. Under static tension loading, cracking in the braider fiber bundles occurred first, and was followed by splitting in curved …
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Triptycene side unit effects on compressive yield strength in polycarbonates
… triptycene-containing polymer chains, and using compression testing. The triptycene polycarbonate was a blend created from two separate products. Differential Scanning Calorimetry was used to determine if the samples had phase separated. Thermal degradation of the samples was checked for using …
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Structural Assessment of Glued-Laminated Timber Columns Subjected to Real Fires
… duration. Detailed visual inspections and axial compression testing of the MTDFTP columns indicated differences between actual charring rates and rates predicted by CSA O86 (2019), and Eurocode 5 (2004). Uneven charring and adhesive degradation were significant factors affecting post-fire …
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Design of an Adjustable Compression Glove for Hand Arthritis
… of alleviating these symptoms is the use of compression gloves, which promote circulation in the hands. However, conventional compression gloves pose several user-based challenges: they are difficult to don/doff; only apply static pressure; and can be uncomfortable, thereby disincentivizing …
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A thermo-mechanical finite element simulation of hot rolling for the prediction of roll forces
… the material flow stress accurately, uniaxial compression testing was conducted in the temperature range of 800-1250° at intervals of 50°C. The strain rates tested were 35, 10, 3.5, 1.0, 0.35, 0.1, 0.01s-1 and each temperature was tested within each strain rate. Stress curves were fitted to an …
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Effects of in vivo degradation on mechanical behavior of a novel bioelastomer
… extracted after each interval, and tested on a compression testing machine. The stress-strain behavior of the PSG was recorded and compared to two theoretical models: a Gaussian model and an 8-chain (non-Gaussian) model. The 8-chain model yielded the better predictions for the highly nonlinear …
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Put Your Back Into It: A Structural and Mechanical Characterization of Iliac Crest and Cervical Spine Autograft for ACDF Surgeries
… relative to the iliac crest through uniaxial compression testing. No significant difference was identified in the morphological and collagen organization properties in tissue from a human clinical cohort; however, directionality and anatomical location significantly impacted the mechanical and …
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Multiscale Numerical Modeling and Characterization of Carbon/Carbon Composites
… mutliscale modeling and mechanical testing of this composite. A set of new elasticity solutions for the carbon fiber surrounded by multiple layers of pyrolytic carbon represented as a multicoated cylinder is presented on the microscale. On the mesoscale, deterministic and statistical …
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