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Showing 1 to 20 of 32 for “"Fatigue crack initiation"”.
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Fatigue crack initiation in weldments
Thesis (Ocean. E.)--Massachusetts Institute of Technology, Dept. of Ocean Engineering, 1994, and Thesis (M.S.)--Massachusetts Institute of Technology, Dept. of Mechanical Engineering, 1994.
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Corrosion fatigue crack initiation in 2091-T351 Alclad
Thesis (Ph. D.)--Massachusetts Institute of Technology, Dept. of Materials Science and Engineering, 1996.
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Fatigue crack initiation and propagation in plain carbon-manganese steels.
Abstract not provided.
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A Model for Joining the Fatigue Crack Initiation and Propagation Analyses
… analytical model for nonarbitrarily defining the crack initiation length (a(,I)) of a notched member on basis of the minimum total life estimate (Life-calculation method) is proposed. The crack initiation length (a(,I)) is not a fixed value, as usually assumed, but varies with stress level (or …
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Fatigue Crack Initiation as a Function of Temperature and Strain Rate
Made available in DSpace on 2014-12-12T00:25:56Z (GMT). No. of bitstreams: 1 7500438.pdf: 1914377 bytes, checksum: fd307c05d347ae8a2d053c0f9dc15893 (MD5) Previous issue date: 1974
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Mechanisms of fatigue crack initiation and propagation in an age hardenable aluminum alloy.
Thesis: Ph. D., Massachusetts Institute of Technology, Department of Metallurgy and Materials Science, 1970
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Estimating Fatigue Crack Initiation and Propagation Lives in Notched Plates Under Variable Loading Histories
Made available in DSpace on 2014-12-14T14:42:12Z (GMT). No. of bitstreams: 1 7726754.pdf: 2508518 bytes, checksum: bd01021ee1432353645ab7bae6a7320f (MD5) Previous issue date: 1977
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Estimation of the Fatigue Crack Initiation Life in Welds Using Low Cycle Fatigue Concepts
Made available in DSpace on 2014-12-14T16:00:30Z (GMT). No. of bitstreams: 1 7616163.pdf: 6125831 bytes, checksum: fc4d671b185ce7bbb03b392488cf016a (MD5) Previous issue date: 1976
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Improving the Fatigue Life of Weldments With Longitudinal Attachments
Fatigue life predictions made using the FEM results of this study were in good agreement with the experimental results. Cold-lap defects were predicted to eliminate the fatigue crack initiation life but to affect the fatigue crack propagation life very little.
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A microstructure based fatigue life prediction framework and its validation
Fatigue crack initiation in polycrystalline materials can be attributed to various mechanistic and microstructural features acting in concert like the elastic stress anisotropy, plastic strain accumulation, resolved shear stress, normal stress, slip-system length, and grain boundary character. In …
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The Fatigue of Weldments Subjected to Complex Loadings
Cruciform and double-strap lap weldments were fatigue tested under constant amplitude axial load and SAE Bracket Spectrum load conditions. For the cruciform weldments, fatigue cracks generally initiate at the root but may initiated the toe if higher bending stresses are induced by joint distortion. …
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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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A Fatigue Life Prediction Method for Tensile-Shear Spot Welds
An empirical Three Stage Initiation-Propagation (TSIP) model has been developed which predicts the fatigue resistance of tensile-shear spot welds under constant amplitude loading test. The TSIP model consists of Stage I--fatigue crack initiation and early growth, Stage II--through sheet thickness …
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Contact stress analysis and fatigue life prediction for a cam-roller follower system
An analytical treatment of the fatigue performance of a cam-roller followler system as influenced by residual stresses induced by grinding, is developed. An approach based on an extended Hertzian analysis is used to determine the 3-D contact stress fields, which are then combined by elastic …
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Some aspects of crack initiation in mild steel subjected to fatigue stressing in a corrosive environment
Some aspects of the corrosion fatigue crack initiation in EN1 type mild steel have been studied. Results of the electrochemical investigations show that the application of both static and compressive stresses enhance anodic dissolution. Application of cyclic stress assists the breakdown of the …
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An active-path-dissolution model for corrosion-fatigue cracking of drill-pipe steels in offshore drilling environments
The corrosion-fatigue life of drill-pipe steels in simulated offshore-drilling environments was predicted using an analytical model. This model, named the Active-Path-Dissolution (APD) model, simulates a sequence of three corrosion-fatigue processes: chemical notching process, microcrack …
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Micromechanistic analysis of fatigue in aluminium silicon casting alloys
… parts and so must be able to withstand the fatigue and high temperature environment of the car engine. It is therefore important to understand the mechanisms of fatigue in these alloys to help inform alloy development for the next generation of pistons.Pistons are typically produced from …
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Fatigue Modeling of U720 --- a Multi-Scale Approach in Understanding Grain Boundary Effects on Crack Initiation
… study, we construct a model for prediction of fatigue crack initiation based on the material's microstructure. Our approach is to model the energy of a persistent slip band (PSB) structure and use its stability with respect to dislocation motion as our failure criterion for crack initiation. …
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Crack coalescence in rock-like material under cycling loading
… loading) have been performed to investigate crack initiation, propagation and coalescence. The specimens have two pre-existing flaws which are arranged at different distances and angles. Wing cracks and secondary cracks are observed in both monotonic and cyclic tests. Wing cracks, which are …
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Grain size effects on the fatigue response of nanocrystalline materials
The resistance of metals and alloys to fatigue crack initiation and propagation is known to be influenced significantly by grain size. Based on a wealth of experimental results obtained from microcrystalline metals, where the grain size is typically greater than 1 um, it is widely recognized that …
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