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Showing 1 to 20 of 94 for “"Fatigue crack growth"”.
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Fatigue crack growth in hydrogen pipeline steels
… embrittlement mechanism is hydrogen accelerated fatigue crack growth since it is well known that hydrogen can enhance fatigue crack growth rates by a factor of 10. In this thesis, the fatigue life of a line pipe manufactured with API steel is calculated by investigating the growth of a …
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Creep and Fatigue Crack Growth in Incoloy Alloy 800H
Made available in DSpace on 2017-07-06T18:48:35Z (GMT). No. of bitstreams: 3 Hour_Kai-Youarn_MS.pdf: 68542035 bytes, checksum: 18c25c093de49ccf4c5fdd0090c5d1e5 (MD5) Hour_Kai-Youarn_MS_ABS.pdf: 914057 bytes, checksum: be05bed33a78bbb0e1e7ea54f2cdc406 (MD5) license.txt: 4813 bytes, checksum: …
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Mechanism of Fatigue Crack Growth at Polymer/metal Interface
Fatigue crack growth along an Al/epoxy interface was examined under mixed-mode conditions. To provide different combinations of Mode-I and Mode-II conditions, a flexural peel (FP) technique was developed, which proved to be particularly useful for subcritical crack growth studies. Using this …
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Finite element simulations of fatigue crack growth and closure
… finite element program was used to simulate fatigue crack growth and closure. The study has identified some of the factors that contribute to crack closure. It has provided an evaluation of stress, strain and displacement fields near crack tips and their contribution to crack closure. The …
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Fatigue crack growth in polycrystalline alumina at high temperatures
High temperature crack growth behavior in a commercial and a hot-pressed polycrystalline Al$\sb2$O$\sb3$ was 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 …
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The fatigue crack growth behavior of superelastic nickel titanium
Understanding of fatigue crack growth phenomena in shape memory alloys under superelastic conditions continues to elude the scientific community: The stress induced martensite phase causes deviations of stress intensity and state at the tip from the classical handbook solutions widely relied on for …
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Fatigue crack growth of Incoloy 908 at high temperature
Thesis (S.M.)--Massachusetts Institute of Technology, Dept. of Nuclear Engineering; and, (S.M.)--Massachusetts Institute of Technology, Dept. of Materials Science and Engineering, 1999.
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Detection of Fatigue Crack Growth in a Simulated Aircraft Fuselage
… emission (AE) nondestructive testing can detect fatigue cracks as they occur in complex structures. One use for AE has been in-flight detection of fatigue cracks in aircraft. The KC-135 aircraft were successfully monitored as early as 1979. The main problem with this and subsequent applications …
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Peridynamic analysis of fatigue crack growth in fillet welded joints
Fatigue assessment is one of the significant factors to be considered for a design life of structure and estimation of structural reliability during operation. Especially, for welded structures, various welding effects, such as stress concentration, residual stresses, weld geometry and weld …
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Effect of Variable Amplitude Loading on Fatigue Crack Growth Rate
Fatigue crack growth (FCG) is a major cause of failure in many engineering component and structure that are subjected to dynamic loading conditions. Several models have been proposed for estimating crack growth rate da/dN under various conditions. The majority of work reported has focused on …
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Environmentally Assisted Fatigue Crack Growth Rates in Sae 4340 Steel
Made available in DSpace on 2014-12-10T17:25:43Z (GMT). No. of bitstreams: 1 6812125.pdf: 2239636 bytes, checksum: 968df985e979bfa982cd263a6dacf4c8 (MD5) Previous issue date: 1968
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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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Monte Carlo study of fatigue crack growth under random loading
Thesis: M.S., Massachusetts Institute of Technology, Department of Aeronautics and Astronautics, 1975
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Life prediction of spot-welds: a fatigue crack growth approach
… method is developed for spot-welds subject to fatigue loading. Stress intensity factors are used with the Walker equation to develop two crack growth approaches to the problem. The predictions fit data for lap joint configurations well, but not so for peel joint geometries.
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Finite element modelling of fatigue crack growth in multi-layered architectures
Crack growth analyses in multi-layered architectures used in the automotive industry for plain bearings, displaying elastic and plastic mismatches, were developed through automated meshing processes based on the Finite Element Method in the commercial code ANSYS. Two-dimensional FE analyses studied …
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Non-linear individual and interaction phenomena associated with fatigue crack growth.
The fatigue of materials and structures is a subject that has been under investigation for almost 160 years; yet reliable fatigue life predictions are still more of an empirical art than a science. The traditional safe-life approach to fatigue design is based upon the total time to failure of a …
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Fatigue crack growth (FCG) modeling in the presence of nano-obstacles
… dynamics simulations is performed to model fatigue crack growth (FCG) in a nano-twinned nickel single crystal. Molecular dynamics simulations are employed to investigate the irreversible interaction of crack-tip emitted dislocations with nano-twins in the vicinity of the crack upon cyclic …
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Relating fatigue crack growth to microstructure via multiscale digital image correlation
This work investigates fatigue crack growth at multiple scales and links material deformation to microstructural properties. The optical technique of digital image correlation (DIC) is well suited for this task since it provides quantitative full-field deformation measurements at multiple length …
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Predicting torsional fatigue crack growth (Mode III) in turbo-generator shafts
Thesis: Ph. D., Massachusetts Institute of Technology, Department of Mechanical Engineering, 1982
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Mechanisms of environmentally influenced fatigue crack growth in lower strength steels
Thesis (Sc.D.)--Massachusetts Institute of Technology, Dept. of Mechanical Engineering, 1981.
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