Topic
Stress concentration
About: Stress concentration is a research topic. Over the lifetime, 23250 publications have been published within this topic receiving 422911 citations.
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TL;DR: A 3D model of shear fracture in an elastic half-space provides insight into the initiation of sliding along weak pre-existing surfaces in rock or consolidated sediments as mentioned in this paper.
117 citations
TL;DR: In this article, a crack in a semi-infinite plate of a functionally gradient material is studied under thermal shock loading conditions, and the results show that by selecting the material constants appropriately, the stress intensity factors can be reduced substantially.
117 citations
TL;DR: In this article, the effect of shot peening on small crack growth and on the fatigue life of 7475-T7351 aluminum alloy has been investigated, and the experimental results show that cracks initiate at second phase particles in the alloy and that fatigue crack growth rates are greatly reduced after shot-peening treatment.
117 citations
TL;DR: In this paper, the authors investigated the fatigue strength, crack initiation and small crack growth behavior in two kinds of squeeze-cast aluminium alloys, AC8A-T 6 and AC4C-T6, using smooth specimens subjected to rotatary bending fatigue at room temperature.
Abstract: Fatigue strength, crack initiation and small crack growth behaviour in two kinds of squeeze-cast aluminium alloys, AC8A-T6 and AC4C-T6 were investigated using smooth specimens subjected to rotatary-bending fatigue at room temperature. Fatigue resistance of these alloys was almost the same as that of the wrought aluminium alloys because of their fine microstructure and of the decrease in defect size due to squeeze-casting. Fatigue crack initiation sites were at the eutectic silicon particles on the surface of specimens or at internal microporosity in the specimens. Crack initiation life, defined as a crack length of 50 μm on the specimen surface, was successfully estimated from an evaluation of initiation sites using fracture mechanics and the statistics of extrema. Small fatigue crack growth in the two kinds of alloys obeys the relation proposed by Nisitani et al., namely that d(2c)/dN = C(σ a /σ B ) a . (2c), where C is a constant and σ B is the ultimate tensile strength. It is pointed out that an improvement in fatigue strength of cast aluminium alloys can be expected by refining the eutectic silicon rather than by an increase in static strength.
117 citations
TL;DR: In this article, the authors trace the nucleation and growth path of natural mud cracks by analyzing in detail crack-surface morphology and show that systematic nucleation at the bottom of the polygons and upward propagation of mud cracks are much more prevalent than previously postulated.
117 citations