332 Result(s)
within
Engineering
Characterization and Evaluation of Materials
Civil Engineering
**hu Li
Article
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Article
The effect of environments on fatigue-crack propagation in an ultra-high-strength steel
The influence of various gaseous environments on the rate of fatigue crack growth at room temperature in an 0.45 percent carbon low-alloy ultra-high-strength steel tempered at 400°F and at 800°F has been inves...
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Electrical potential modeling of the anti-plane problem
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Dynamic fields generated by rapid crack growth
Stresses and strains near a rapidly propagating crack tip are affected by the mass density of the material. This paper starts with a brief summary of analytical results for near-tip dynamic fields as predicted...
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Dynamic emission of dislocations from a crack tip — a computer simulation
The behavior of dynamic emission of dislocations from the tip of a stationary crack under mode II or mode III loading is examined. A critical stress intensity factor, K D is assumed for dislocation emission. Afte...
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Article
A nonlocal damage theory
A nonlocal damage field theory is proposed and a response model of nonlocal elastic damage is given. A simulating experiment using aluminum alloy plates with arrays of holes shows that the load bearing capacit...
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The plastic zone ahead of a mode II plane strain crack
The problem of a mode II plane strain crack in an elastic perfectly-plastic solid is analysed. It is shown that the elastic singular field for a crack cannot be matched with the near-tip field. Hence, the usua...
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An experimental evaluation of the J-integral in 30 percent side-grooved three point bend [SE(B)] specimens
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Article
Dynamic effects on the near crack-line fields for crack growth in an elastic perfectly-plastic solid
The dynamic effects on the near crack-line fields for steady-state tensile crack growth in an elastic perfectly-plastic solid are investigated under plane stress condition in this paper. In the plastic loading...
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Characterization of near tip stress and deformation fields in cree** solids
Finite element solutions for near tip stress and deformation fields in elastic-power law cree** solids are used to investigate the dominance of the asymptotic crack tip fields. With geometry changes neglecte...
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The stress field in an edge cracked plate in anti-plane deformation
The anti-plane strain problems of an edge cracked elastic plate under 1) uniform surface displacement load and 2) surface line loads are solved using conformal map** techniques. The solutions yield stress, s...
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Article
Creep crack growth by grain boundary cavitation: crack tip fields and crack growth rates under transient conditions
Transient creep crack growth due to grain boundary cavitation, and under plane strain and small scale creep conditions, is investigated. Full account is taken of the finite geometry changes accompanying crack ...
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Article
Fracture strength of spheroidal carbide particle
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Temperature dependence of deformation and fracture for a low alloy Mn-steel
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On the interaction among stage I short crack, slip band and grain boundary: a FEM analysis
A FEM model of a stage I short crack in polycrystals was constructed based on the micromechanics and the physical process of its growth. The effective stress and effective plastic strain at the growing stage I...
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A method for calculating elastic deformations of crack body and its application prospects
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A hybridized displacement discontinuity and indirect boundary element method to model fracture propagation
In mechanical modelling of fracture propagation, complications arise from the stress concentrations at the fracture tips and nonlinear responses caused by opening/closing of fractures, by nonlinear constitutiv...
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Determination of the ductile plastic damage variable for the annealed 30CrMnSi
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The dynamic near crack-line fields for mode II crack growth in an elastic perfectly-plastic solid
The dynamic near crack-line fields for mode II crack growth in an elastic perfectly-plastic solid are investigated under plane strain and plane stress conditions. In each case, by expanding the plastic fields ...
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Effects of prestrain on the crack rotational factor for pressure vessel steels
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Effects of prestrain on the fracture properties of pressure vessel steel
In this paper, various methods have been used to measure the effects of prestrain on the fracture toughness of 20 g steel experimentally. Based on elastic-plastic FEM analysis, the relationships between crack ...
