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 52 for “"Fatigue Test"”.
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Rotation analysis of a microfabricated fatigue test structure
Thesis (S.M.)--Massachusetts Institute of Technology, Dept. of Electrical Engineering and Computer Science, 1999.
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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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New Fatigue Test Method for Evaluating the Performance of Adhesive Bonded Joints
… Therefore, an understanding of the effect of fatigue and environmental conditions on the performance of adhesive joints, at the design stage, are considered critical parameters for reliable joint design. Whilst it is recognized that fatigue is responsible for a significant number of failures …
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Evaluation of rolling contact fatigue resistance for coated components
… mechanisms, techniques and machines for testing rolling contact fatigue failure resistance and load capacity of coated components. The thesis investigates both normal and accelerated rolling contact fatigue evaluation test mechanisms and their models, and evaluation test technique …
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The development and application of the load-stroke hysteresis technique for evaluating fatigue damage development in composite materials
… to measure the hysteresis loss during a fatigue test from the load and stroke signals of a standard servo-hydraulic materials testing system. The method was used to characterize changes in properties and performance induced by long-term cyclic loading. Advantages of the load-stroke …
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A micro-scale method to associate the fatigue properties of asphalt binder, mastic and mixture
The fatigue damage is one of the most common distresses observed on the asphalt concrete pavement. The initiation and propagation of the fatigue damage is a complicated phenomenon and very difficult to detect. In order to thoroughly understand the fatigue of asphalt concrete, the behaviors of the …
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Applicability of undermatched welds for high strentgh steel structures
… U.S. Navy, quenched and tempered steels. The test methods are the self restraint cracking test, the tensile test and the fatigue test. The investigated parameters are the strength of the weld metal and the preheat temperature. The self restraint cracking test does not show clearly the expected …
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Further Development of the Total Fatigue Life Model for Weldments and Its Application to Fatigue Design
Cruciform joints were fatigue tested under SAE Bracket variable loading history. Tube-to-plate welds were fatigue tested under bending and torsion loading conditions. Fatigue test results were compared with predictions made using the total fatigue life model which predicts the total fatigue life of …
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An investigation of polymer wear due to fatigue using a constant strain wear test
A constant-strain wear test apparatus was built and used to test polyethyleneterephthalate. The results of the constant-strain wear tests were compared to results from a constant-strain fatigue test. The results of the wear test showed that the polymer did not fatigue below the surface where the …
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High temperature creep-fatigue behavior of alloy 617 and alloy 230
… used in the VHTR is predicted to be creep-fatigue damage, which arises due to startup and shutdown or power transients during normal operation. The mechanism of synergic interaction between creep and fatigue is not well understood and there are no effective modeling methods for predicting …
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The static and fatigue behavior of low profile precast concrete sleepers
… concrete sleepers was studied under static and fatigue loading regimes using a tuned finite element model and four point flexure laboratory tests. The fatigue tests were conducted by following the procedure specified in the Australian railway code (AS 1084.14-2012). The usefulness of the …
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Stability of long multiple-rod constructs and dual-rod constructs in the thoracic spine: a biomechanical cadaveric study
… with either a DRC or MRC, and biomechanical testing was then carried out to compare range of motion (ROM) and stiffness between these two constructs. Results demonstrated comparable absolute total ROM and stiffness between DRCs and MRCs, and this was consistent across all measured vertebral …
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Post-Activation Potentiation: Decay or Fatigue Delay
… potentiation, the proposed reason is fatigue, but the interaction of post-activation potentiation and fatigue have not been thoroughly tested. The purpose of this study was to assess the interaction of fatigue and post-activation potentiation. The present study tested recreational, …
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The effect of loading frequency and loading level on the fatigue behavior of angle-ply carbon/PEEK thermoplastic composites
… of loading frequency and loading level on the fatigue behavior of ($\rm{\pm}45\rbrack\sb{4s}$ carbon/PEEK composite was investigated. Tention-tention load controlled fatigue tests were performed on straight sided samples using a 100-KN MTS machine. Three loading frequencies (1Hz, 5Hz, and 10Hz) …
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Modelling to predict the reliability of solder joints
… covering analytical methods, creep laws and fatigue laws, and advanced damage mechanics methods. The use of FEA (Finite Element Analysis) to model creep along with a fatigue law to predict lifetime appears to be the most widely used and validated technique at present. The FEA discretisation …
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Fatigue-fracture relation on asphalt concrete mixtures
… is to examine potential relationships between fatigue and fracture parameters obtained from standardized laboratory tests. A flexural bending beam test was used to obtain two fatigue parameters, which include a traditional fatigue criterion based on stress or strain to find number of cycles to …
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A unified fracture mechanics approach to fretting fatigue crack growth
… the adequacy of a modeling approach of fretting fatigue for a sphere-on-flat geometry entirely based on fracture mechanics. All stages of damage evolution, from initiation to failure, are encompassed within the framework of fracture mechanics, in contrast with the general use of stress based …
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Improving fatigue life predictions: theory and experiment on unidirectional and crossply polymer matrix composites
A method is presented by which fatigue life predictions of polymer matrix composites may be improved. First a "critical element", whose failure defines global failure of the material. is identified. The global stiffness changes of the specimen during a fatigue test are monitored and taken to be …
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An Evaluation of Optical Fiber Strain Sensing for Engineering Applications
A fatigue test has been performed on 7075-T651 aluminum specimens which were bonded with polyimide coated optical fibers with discrete Bragg gratings. These fibers were bonded with AE-10 strain gage adhesive. The results indicate that lower strain amplitudes do not produce cause for concern, but …
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A Self-contained Wireless Structural Health Monitoring Tool
… actively or passively using non-destructive testing (NDT) and non-destructive inspection (NDI) techniques. NDI crack detection and strain measurement systems are currently used in critical areas of structures, but are limited due to needing wires for communication and a power source. Although …
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