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 26 for “"cyclic fatigue"”.
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Acousto-Ultrasonic Evaluation of Cyclic Fatigue of Spot Welded Structures
… development in tensile shear spot welds during fatigue loading. There is reasonable data to support the hypothesis that a decrease in an AU signal is indicative of the presence of an internal crack and could be used for monitoring and evaluation purposes.
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Fatigue crack growth in polycrystalline alumina at high temperatures
… examined under monotonic tensile loading (static fatigue) and under Mode-I tension-tension cyclic loading (cyclic fatigue). The investigation of fatigue crack growth in polycrystalline Al$\sb2$O$\sb3$ has confirmed the cyclic effect existing in ceramic materials, but this cyclic effect cannot be …
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Fatigue crack growth in ceramics containing a viscous grain boundary phase at elevated temperatures
… examined under tensile static loading (static fatigue) and tension-tension cyclic loading (cyclic fatigue). The study was carried out at temperatures of 700-900$\sp\circ$C, where the vitreous grain boundary phase flowed viscously. Experimental results have shown the existence of cyclic fatigue …
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SODIUM HYPOCHLORITE'S EFFECT ON NICKEL-TITANIUM ROTARY INSTRUMENTS AND ITS EFFECT ON RESISTANCE TO FRACTURE
… After immersion, files were subjected to cyclic fatigue testing. Time to fracture was recorded and analyzed by a two-way ANOVA. Tukey's honest significant difference was used to identify any differences in immersion times. Within all ProFile groups and partial immersion K3 groups, there …
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Mechanical evaluation of a modified prosthetic laryngoplasty using a toggle technique for the equine arytenoid cartilage
… This gradual loss is typically attributed to cyclic fatigue of the muscular process of the arytenoid and partial suture pull-through from the cartilage. A modified laryngoplasty technique was developed to add strength and stability to the prosthesis with the purpose of reducing cyclic fatigue. …
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Modeling of plastic deformation due to slip-its implications in characterizing fatigue crack growth thresholds and non-Schmid behavior in transforming alloys
… of the crack-tip emitted slip under cyclic fatigue loading, (ii) the atomistic scale lattice resistance against glide motion of dislocations in a perspective of laying out the dislocation core-crystal structure and applied loading interplay in particular embracing the plastic behavior …
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The mechanical properties of tightly woven carbon-carbon composites
… in argon at room temperature.</p> <p>The cyclic fatigue behavior of these composites was investigated as a function of stress levels. Fatigue tests were performed in tension-tension mode under ambient laboratory conditions. The applied stress levels versus number of fatigue cycles (S-N …
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Intracavity optical parametric oscillators based on orientation-patterned gallium arsenide
… for mechanical testing. Both static and cyclic fatigue tests were carried out in order to evaluate the performance of the new design. The results show that the MISHS performed similarly to the SHS in testing. With further development the MISHS has the potential to significantly improve …
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The folding Roboscooter : structural analysis for an electric scooter used in urban conditions
… up the main body of the scooter are subject to cyclic fatigue due to riding conditions such as bumps, which aside from decreasing the life of structural elements, also cause the largest forces on the scooter's frame. The Roboscooter was analyzed under maximum load conditions to determine the …
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Microstructure Characterization of SUS444 Ferritic Stainless Steel
… for a thin exhaust manifold must tolerate cyclic thermal fatigue. In SUS 444, this characteristic is directly related to the influence of microstructure on high temperature strength and the stability of the microstructure at the high operating temperature range. The goal of this research is …
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Quasi-Static Tensile and Fatigue Behavior of Extrusion Additive Manufactured ULTEM 9085
… service. In this study, quasi-static tensile and cyclic fatigue tests were performed on ULTEM 9085 samples fabricated by fused deposition modeling (FDM). First, tensile tests were conducted following ASTM D638 on three different build orientations with default build parameters to determine the …
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Fatigue and fracture of cement mortars containing fly ash
… to investigate the effects of fly ash on the fatigue resistance of cement mortars when included as a partial cement replacement, and to seek to improve the understanding of cyclic fatigue crack growth mechanisms in cementitious materials. Mortar mixes were prepared with similar compressive …
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Fatigue behaviour of CFRP-repaired corroded RC beams
… often subjected to oscillating loads that cause fatigue, significantly reducing the life of the structure. With the use of fibre reinforced plastics (FRPs) to rehabilitate and extend the life of structures, the remaining fatigue life after the repair must be assessed. This research is focused on …
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An experimental investigation of the material response of graphite/polyphenylene sulfide
… assessed. Both quasi-static tension tests and cyclic tension-tension (R=0.1) fatigue tests were performed on (0/±45/90)<sub>s</sub> and (0/90₃)<sub>s</sub> specimens. A variety of NDT techniques were used to inspect the "as received" panels and to monitor the formation and growth of damage …
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A novel polymeric prosthetic heart valve: design, manufacture, and testing
… index comprising the flexural modulus and the cyclic fatigue stress predicted by fracture mechanics methods. Polystyrene-block-polyethylene-polypropylene-block-polystyrene with 22 mol% polystyrene (SEPS22) was selected for further testing and use in the design. Haemocompatibility and …
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Effect of fatigue loading on impact response of rat ulna
… of stress fracture is a consequence of both fatigue and impact loading of the bone that will potentially threat athletes’ careers. Scientists and engineers have studied the fatigue properties of many engineering materials, and more recently biological materials. Investigating the role of …
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Mechanical characterization and self-healing in synthetic vascularized materials
… large damage volumes under both quasi-static and fatigue loading conditions. Damage events that occurred in the same location are healed multiple times owing to the interconnectivity of the vascular system, which allows the flow of liquid healing agents from undamaged regions of material to the …
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The Effect of Chemistry and Network Structure on Morphological and Mechanical Properties of Diepoxide Precursors and Poly(Hydroxyethers)
… ester system and composite cyclic fatigue durability was improved by ~50 %. Using a poly(hydroxyether ethanolamine) interphase material, which was not miscible with the resin, resulted in a sharp interface. While the adhesion was not improved through the use of this sizing, …
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DEVELOPMENT OF FATIGUE MODELS FOR COPPER TRACES ON PRINTED WIRING ASSEMBLIES UNDER QUASI-STATIC CYCLIC MECHANICAL BENDING
This dissertation investigates the fatigue durability of copper (Cu) traces on printed wiring assemblies (PWAs) under quasi-static cyclic mechanical flexure, using experimental results from a set of three-point bending fatigue tests, finite element (FE) modeling of the stresses generated during the …
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Comprehensive Evaluation of Asphalt Mixtures in Arid Climatic conditions
… dynamic modulus (|E*| referred to as E*), cyclic fatigue (CF), and stress sweep rutting (SSR), at unconditioned (UC) and moisture-conditioned states at one freeze-thaw cycle (1-C) and three freeze-thaw cycles (3-C). The TSR, HWTT, and E* were performed for both the asphalt mix designs. …
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