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: Fracture toughness is determined for sharp, long and short cracks and a good agreement is found between the two types of cracks, and the cyclic fatigue threshold still stands above that of current biomedical grade alumina and zirconia.
181 citations
TL;DR: In this paper, the authors proposed a new method for evaluating the structural or geometric stress in welded constructions based on the computed stress value 1-mm below the surface in the direction corresponding to the expected crack path.
181 citations
TL;DR: In this article, two specially developed techniques were used to study the nucleation and growth of grain-boundary cavities in 304 stainless steel at 0.5 Tm and found that cavities nucleated heterogeneously throughout the creep history and those observed were well in their growth stage.
180 citations
TL;DR: In this paper, the concept of roughness-induced crack closure is utilized to explain the role of prior austenite grain size and pearlite interlamellar spacing on near-threshold fatigue crack propagation in fully pearlitic eutectoid steel tested at low and high stress ratio in lab air and purified helium.
Abstract: The concept of roughness-induced crack closure is utilized to explain the role of prior austenite grain size and pearlite interlamellar spacing on near-threshold fatigue crack propagation in fully pearlitic eutectoid steel tested at low and high stress ratio in lab air and purified helium. It is shown that at low load ratios, near-threshold growth rates are significantly reduced for coarse-grained microstructures, compared to fine-grained at constant yield strength, due to roughness-induced crack closure. Using roughness-profile microscopy, it was found that fracture surface roughness near threshold scaled with grain size and inversely with yield strength, macroscopic roughnesses at threshold being considerably larger than the conventionally calculated cyclic crack tip opening displacement. Auger analysis of near-threshold corrosion products showed it to be iron oxide; the oxide thickness was seen to be decreased by increased stress ratio. The significance of this model to near-threshold fatigue crack growth behavior, in terms of load ratio, microstructure, and environment is discussed.
180 citations
TL;DR: De Gennes and Okumura as mentioned in this paper constructed a coarse-grained elastic energy for such an anisotropic system and presented an analytic solution for a notch crack normal to the stratified sheets.
Abstract: Nacre, stratified ceramic layers surrounded by organic matrix, is a tough material found inside certain seashells. We construct a coarse-grained elastic energy for such an anisotropic system and present an analytic solution for a notch crack normal to the stratified sheets. This analysis proves the reduction in stress concentration which was announced in our earlier work (P. G. de Gennes and K. Okumura, C. R. Acad. Sci. Paris 1, Ser. IV, 257 (2000)) and the related increase in toughness.
179 citations