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 97 for “"Fatigue testing"”.
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Micromechanical fatigue testing
Thesis (Ph. D.)--Massachusetts Institute of Technology, Dept. of Mechanical Engineering, 1992.
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Software tools for computer-controlled fatigue testing
… software, the response of the Materials Testing System was investigated for distortion and attenuation. In particular, the effect of the resolution of the waveform on the test system response was noted. There was negligible attenuation for full scale frequencies of up to 20 Hz. Greater …
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On an Accelerated Fatigue -Testing Technique Using Piezoelectric Actuators
… transition alone did not result in ferroelectric fatigue. Rather, this fatigue is more likely due to electric charge accumulations at grain boundaries induced by repeated 180° domain switching.
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Methods and devices for corrosion fatigue testing without acceleration
… class of vessels. On existing classes, corrosion fatigue limits this interval, but data on corrosion fatigue life is sparse and incomplete. An existing model from previous research has been updated and stands ready to provide predictions, given more relevant data. Techniques and devices are …
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Rolling contact fatigue testing of 9260 steel processed by quenching and partitioning
Includes bibliographical references (pages 121-125).
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Fatigue testing of partial-depth precast concrete bridge deck panels with embedded wire trusses
This thesis covers research into the fatigue behavior of a new precast concrete panel to serve as stay-in-place formwork for the overhang portions of Texas bridge decks. The panel provides structural resistance alongside standard prestressed concrete panels (PCP) to provide formwork across the …
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Thermal and fatigue testing of fiber reinforced polymer tie connectors used in concrete sandwich walls
… program was to determine the strength, strain, fatigue, temperature, and other corresponding behavioral characteristics of concrete sandwich wall panels containing the new Delta TieRTM fiber reinforced polymer (FRP) tie connector produced by Dayton/Richmond, a brand of Dayton Superior. The scope …
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Design and implementation of an apparatus for hydrodynamic and fatigue testing of prosthetic aortic valves
… the market they are required to undergo rigorous testing to verify performance and product life expectancy. Performance testing is done in a hydrodynamic test apparatus and life expectancy verified in an accelerated test apparatus. The Cardiology Department at Tygerberg Hospital has proposed a …
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Proof of Concept Test for Dual-Axis Resonant Phase-Locked Excitation (PhLEX) Fatigue Testing Method for Wind Turbine Blades
… are critical components, and full-scale blade fatigue testing is a necessary step to validate blade designs. A collaborative effort between the National Renewable Energy Laboratory (NREL) and Embry-Riddle Aeronautical University (ERAU) has resulted in the development of the dual-axis resonant …
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A Low Cycle Fatigue Testing Framework for Evaluating the Effect of Artifacts on the Seismic Behavior of Moment Frames
… systems with artifacts. For instance, full-scale testing of moment resisting connections is expensive which makes it economically infeasible to experimentally examine the wide range of possible artifact types, artifact locations, and structural configurations. A framework has been developed for …
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The Development of a Phase Locked Wind Turbine Blade Finite Element Model to Predict Loads and Deflections During Fatigue Testing
<p>Full scale blade testing provides blade manufacturers with quantitative data in order to assess blade design, manufacturing and durability. Structural testing is a requirement in order to design reliable blades, and to develop a further understanding of the dynamics involved in a modern turbine …
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The Development of an Adaptive Control System for a Phase-Locked Excitation (PhLEX) Method for Advanced Wind Turbine Blade Fatigue Testing
… means necessary for advanced wind turbine blade testing. To improve on the current testing methods, a new testing method is being developed using the existing dual-axis fatigue testing capabilities in conjunction with another actuator to provide a phase-locked excitation method with adaptive …
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Advances in iterative learning control with application to structural dynamic response reconstruction
… such as ground vehicles, for purposes of fatigue testing. The compensator that is employed in ILC in such cases is traditionally an approximate, linear inverse model of the closed-loop test system. This research presents advances in ILC, particularly with respect to its application in …
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Evaluation of Stress and Fatigue in Femoral Hip Implants
… an accurate theoretical assessment of fatigue life is critical. In order for a femoral implant design to be launched to the market, fatigue testing is required by regulatory bodies as evidence of the implant strength to different potting scenarios. The time required to cut forging dies, …
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The Effect of Catalyst Layer Cracks on the Mechanical Fatigue of Membrane Electrode Assemblies
Mechanical fatigue testing has shown that MEAs (membrane electrode assemblies) fail at lower stresses than PEMs (proton exchange membranes) at comparable times under load. The failure of MEAs at lower stresses is influenced by the presence of mud cracks in the catalyst layers acting as stress …
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Productization and instrumented testing of a corrosion fatigue test device
Corrosion Fatigue has been identified as the limiting factor of submarine propulsion shaft operation intervals. Increasing the inspection interval from 6 to 12 years could save a significant amount of money on procurement and maintenance costs. Corrosion fatigue data is sparse and incomplete and an …
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Fatigue Performance and Shear Demand Distributions of Clustered Shear Connectors in Composite Bridge Girders
… in composite bridge girders using large-scale fatigue testing and direct pressure measurements for stud force calculations. In this study, two large-scale composite beam specimens were fatigue tested to determine the effects of stud clustering on stud shear demands and fatigue life. One …
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A process and investigation into the influence of cast surface condition on fatigue life
… the impact of varying cast surface conditions on fatigue performance, in the presence of other casting indications such as gas and shrinkage porosity. Additionally, this research aims to draw connections between nondestructive evaluation (NDE) techniques and fatigue results of cast test specimens. …
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Transmitted light intensity as a nondestructive evaluation technique for glass/epoxy composite laminates
… transmitted through a composite sample during fatigue testing, changes in the intensity were correlated to damage development within the sample. By applying image enhancement and analysis techniques, damage development due to matrix cracking and delamination, was detected and presented in …
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