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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 62 for “"stress values"”.
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Polymerization shrinkage stress of light curing dental composites
… To analyze the polymerization shrinkage stresses flowable and universal dental composites at different times. MATERIALS AND METHODS: Seven flowable and four universal composites; were used in this study. Two glass cylinders were fixed in a vertical position on the INSTRON machine; leaving …
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Pressure, temperature, and stress conditions of Southern Alpine Fault (New Zealand) mylonites
… 𝜇m in mylonitic quartz indicating differential stress values in the south of ~100 MPa, roughly twice the stress values observed in the central Alpine Fault. Constraints from Ti-in-quartz thermobarometry and Raman Spectroscopy of Carbonaceous Material (RSCM) indicate mylonitization occurred at …
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Development of bimodal grain structures and their effect on toughness in HSLA steel
… fracture toughness by comparing local fracture stress values for uniformly fine, uniformly coarse and bimodal ferrite grain structures. Analysis of local fracture stress values suggests that bimodality can raise the scatter in the fracture test results and therefore, it is undesirable. Current …
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Structure property behavior of an ethylene-propylene-diene ionic terpolymer containing zinc stearate
… a reinforcing filler under ambient conditions. Stress-strain behavior, percent relaxation, hysteresis and permanent set were all found to increase with increasing ZnSt content. Increases in stress values upon annealing for all samples were attributed to increased ionic domain formation and …
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Tensile behavior of aluminum reinforced with angle-ply boron epoxy laminates
… was conducted. It is shown that the ultimate stresses of a wide variety of laminate configurations fall within a very narrow range of values. Some configurations of composite reinforced aluminum laminates exhibited higher ultimate stress values than the corresponding all composite laminates …
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A theoretical approach to the prediction of haemolysis in centrifugal blood pumps
… trauma which is primarily caused by hydrodynamic stresses. A general mechanical blood damage theory was developed which comprises a combination of the information about mechanical loading of blood with the knowledge of its resistance properties. In this theory arbitrary loading-time functions are …
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Evaluation of the dynamic characteristics of the K-Gill anemometer
… with an error of 2%. To determine the Reynolds stress values, uw covariance and friction velocity from different methods were compared. When the stability conditions were unknown, the resulting Reynolds stress estimations have 15% relative differences between different methods.
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Exchange flows in an urban water body: Bayou St. John responses to the removal of flood control structures, future water elevation control, and water quality
… impact the local ecology but predicted shear stress values did not reach a critical value (0.1 N/m<sup>2</sup>) for resuspension. Removal of the waterfall structure will benefit Bayou St. John by decreasing energy losses from the Lake, however a more pronounced tidal signal from Lake …
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Thermal stress analysis of thermally sprayed coatings on a spent nuclear fuel waste package
… a coated waste package may experience. Residual stress from the thermal spray process is one of these effects and in this study two modeling methods are compared. Finally, a finite element analysis of the initial emplacement of the spent nuclear fuel in the waste package is used to determine if …
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Quantitative Fracture Strength of Lithiated Tin Oxide Nanowires by In-Situ SEM Tensile Experiments
… system (MEMS) uniaxial tensile testing device. Stress values were calculated from load and displacement data from an inSEM nanoindenter tip while strain values were obtained using digital image correlation (DIC) from in situ SEM test images. The SnO2 nanowires were synthesized using the …
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Stylizing 3D Models With Generative AI for Fabrication
… of the modified models. By analyzing changes in stress values during a simulated drop test at various stages of the stylization process, MechStyle restricts changes to those that preserve the model's structural viability. This ensures that the resulting models are both stylistically accurate to …
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A simulation model for stress measurements in notched test specimens by x-ray diffraction
An analytical model was developed to simulate the stress state of notched tensile specimens. Actual experiments are being carried out by other investigators to study the relaxation of residual stresses in specimens containing stress raisers. In the present work, the stress state developed in …
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Rheological examination of domestic sewage sludge
… and Maron (1) were used to determine the shear stress and velocity gradient. A series of graphs involving shear stress vs velocity gradient were plotted. These graphs were compared to the Standard Newtonian and Non-Newtonian curves, in order to determine the flow behavior of the sludges. The …
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Bedload transport: the effects of particle shape and an investigation of a wide range of transport rates
… that the reference transport critical shear stress for the median surface grain size is approximately 2 to 3 times higher than those for more spherical particles. This conclusion indicates a lower susceptibility of disc-like particles to initial entrainment and lower transport rates for given …
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Human Knee FEA Model for Transtibial Amputee Tibial Cartilage Pressure in Gait and Cycling
… a transtibial amputation. Abnormal cartilage stress can cause higher OA risk, however it is unknown if there is a connection between exercise type and cartilage stress. To help answer this, a tibiofemoral FEA model was created. Utilizing linear elastic isotropic materials and non-linear …
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The Effects of Biofeedback on Task Performance
… individual's peak performance while performing a stress-provoking task. In a between subjects design 30 individual college students were divided into 2 groups. One group received auditory biofeedback and relaxation training, and the other group received no training. Both groups met the researcher …
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A continuum surface layer effect in polycrystalline aggregates
… Ti-6Al-4V and aluminum 7475-T651 show that the stress in the direction of load application determined by x-ray diffraction and the nominal applied stress display the expected linear correspondence up to a maximum stress somewhat below the bulk yield paint. Above this stress, the xray stress is …
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Push out strengths of a double tapered post system with 3 different cements
… resin cements would produce the highest debond stress values with a double-tapered fibre post system. In the past, conventional parallel- sided prefabricated or cast metal posts have been used, which has considerable mechanical strength but lacks aesthetic capabilities. Post preparation …
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Channel Processes and form Near the Tidal Limit
… occur at bends in the channel. Estimated shear stress values within my study site show that tidal flow during ebb or flood tide is too weak to induce erosion. This indicates my study site is a river dominated environment with the deeps likely formed as a result of enhanced secondary currents …
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Nondestructive Evaluation of Engine Run Turbine Blades Using Laser Ablation and Photoluminesence Stress Measurements
… the peaks, which can then be converted into a stress, and consequently, applied to a remaining lifetime model. The key challenge is detecting the signal though the over lying coating as one must look directly through the TBC ceramic in order to detect signals from the TGO. Engine-run blades …
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