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Showing 1 to 20 of 184 for “"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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Crack initiation and propagation in rock.
Thesis (Civ. E.)--Massachusetts Institute of Technology, Dept. of Civil Engineering, 1968.
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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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Computational modeling of crack initiation in cross-role piercing
… ahead of the piercing plug. In this work the crack initiation that leads to the creation of tile small hole has been modeled. The Gurson-Tvergaard-Needlemnan model of porous plasticity is used to simulate the Mannesmann effect. The appearance of a crack at the center of the cylindrical bar is …
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Modeling of crack initiation, propagation and coalescence in rocks
… in and on rock. Fracturing is associated with crack initiation, propagation and coalescence, which have been studied experimentally and analytically by many researchers. The analytical models developed to describe the initiation and propagation of cracks in brittle materials can be incorporated …
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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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Crack Initiation Analysis in Residual Stress Zones with Finite Element Methods
This research explores the nearly untapped research area of the analysis of fracture mechanics in residual stress zones. This type of research has become more prevalent in the field in recent years due to the increase in prominence of residual stress producing processes. Such processes include …
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Creep crack initiation and growth in 2.25% chromium - 1% molybdenum alloy steel
… response ahead of a defect during the crack initiation, or incubation, period.</p> <p>The investigation was conducted by carrying out creep tests on compact tension specimens in three microstructural variations of the alloy and, subsequently, using optical, scanning and transmission …
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Geophysical signatures of crack initiation and growth in rocks under uniaxial compression
… rocks is a complex phenomenon. Understanding the crack nucleation, propagation, and mechanisms involved during rock fracture plays an important role in the design of engineering structures, in the field of seismology, in natural resource extraction, different rock-breaking processes such as …
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Pitting and crack initiation in high strength aluminum alloys for aircraft applications
Thesis (Sc. D.)--Massachusetts Institute of Technology, Dept. of Materials Science and Engineering, 1996.
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Micromechanics of Hydrogen-Induced Crack Initiation in Pipeline Steels and Subcritical Crack Growth
… on ductile fracture, we model sustained-load cracking in the iron-base superalloy 1N903 at hydrogen pressures at which fracture is governed by plasticity. Through a micromechanics analysis, we quantify the void growth dependence on stress triaxiality and hydrogen-induced material softening as …
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The mechanism of crack initiation in silicon-iron under elevated temperature fatigue conditions.
Thesis: M.S., Massachusetts Institute of Technology, Department of Mechanical Engineering, 1973
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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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Statistical distribution of times to crack initiation in service using C-130 inspection data
Methods by which in-service crack inspection data may be reduced to yield meaningful time to crack initiation and initial flaw size data are examined. A method is developed by which inspection data consisting of time of inspection and crack length can be used to determine. crack growth constants. …
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Grinding of advanced ceramic materials: experimental and theoretical investigation into crack initiation and propagation
… of elastic/plastic deformation, and subsequent cracking. For ceramic materials such as silicon nitride, two types of damage can occur; firstly surface damage in the form of machining marks which cause stress concentrations and surface cracks and secondly sub-surface cracking. These problems …
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Strain Energy Density and Thermodynamic Entropy as Prognostic Measures of Crack Initiation in Aluminum
… design life is the prediction of an initiating crack and the prevention of damage, estimation of remaining useful life, schedule maintenance and to reduce costly downtimes and inspections. The research presented in this dissertation explores the cumulative plastic strain energy density and …
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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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