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Showing 1 to 20 of 308 for “"crack growth"”.
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Crack growth resistance in nuclear graphite
R-curve behaviour is often used for evaluating crack growth resistance in quasibrittle materials but few studies have focused on polycrystalline graphite. In this study, R-curve behaviour in three commercial grade nuclear graphites, of varying structure and properties, is compared using an optical …
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Subcritical crack growth in polysilicon MEMS
Thesis (Ph. D.)--Massachusetts Institute of Technology, Dept. of Mechanical Engineering, 1997.
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Subcritical crack growth in zirconium alloys
Thesis (Ph.D.)--Massachusetts Institute of Technology, Dept. of Materials Science and Engineering, 1982.
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Fatigue crack growth in hydrogen pipeline steels
… 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 semi-elliptical …
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Crack growth during brittle fracture in compression.
Massachusetts Institute of Technology. Dept. of Geology and Geophysics. Thesis. 1965. Ph.D.
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Modeling fully plastic, plane strain crack growth
Thesis (Ph. D.)--Massachusetts Institute of Technology, Dept. of Mechanical Engineering, 1994.
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Steady crack growth through ductile metals: Computational studies
This thesis examines the crack-front response during sustained ductile tearing in structural metals at quasi-static rates using high resolution finite element computations. At load levels approaching the steady-growth regime, well-established computational methods that model material damage break …
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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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Fatigue Damage and Small Crack Growth During Biaxial Loading
The progressive nature of fatigue damage under biaxial loading has been investigated. Experiments were performed on thin-wall tubular specimens of 1045 steel in tension, torsion, and combined tension-torsion loading. Two equivalent strain amplitudes, one in the high cycle fatigue (HCF) region and …
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Finite element simulations of fatigue crack growth and closure
… 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 thesis …
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Internal hydrogen-induced subcritical crack growth in stainless steels
… with optical calibration was used to monitor the crack growth position, continuously.
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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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Computational aspects of ductile crack growth in three dimensions
Thesis (S.M.)--Massachusetts Institute of Technology, Dept. of Mechanical Engineering, 2003.
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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
… (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 was an …
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Crack Growth Mechanisms under Anti-Plane Shear in Composite Laminates
… on determining the mechanisms associated with crack growth in polymer matrix composite laminates subjected to anti-plane shear (mode III) loading. For mode III split-beam test methods were proposed, and initial evaluations were conducted. A single test method was selected for further …
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Peridynamic analysis of fatigue crack growth in fillet welded joints
… classical methods to predict the crack propagation under cyclic loadings have some difficulties in treating complicated patterns of crack growth. A peridynamic theory, however, has powerful advantage on discontinuities. A peridynamic fatigue model, which is a bond damage model of …
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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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