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: In this article, a model for the prediction of growth rates of fatigue cracks in aluminium alloys is presented based on an approximate description of the crack closure behavior and can be used to predict effects of crack growth acceleration and retardation observed experimentally under variable-amplitude loading.
Abstract: A model for the prediction of growth rates of fatigue cracks in aluminium alloys is presented. The model is based on an approximate description of the crack closure behavior and can be used to predict effects of crack growth acceleration and retardation observed experimentally under variable-amplitude loading. A computer program was developed for analysis of fatigue crack growth. It was used to analyze the effect of certain parameter variations in a flight simulation load spectrum on the crack growth rate. For 7075-T6 thin sheet material the results are compared with experimental data.
141 citations
141 citations
TL;DR: In this article, the influence of mean stress and microstructure on fatigue crack growth near the threshold stress intensity for crack propagation, was investigated in humid air over a very wide spectrum of growth rates from 10/sup -8/ to 10/Sup -1/ mm/cycle.
Abstract: Fatigue crack propagation behavior of an ultra-high strength steel (300-M) has been investigated in humid air over a very wide spectrum of growth rates from 10/sup -8/ to 10/sup -1/ mm/cycle. Particular emphasis has been devoted to the influence of mean stress (or load ratio R = K/sub min//K/sub max/) and microstructure on fatigue crack growth near the threshold stress intensity for crack propagation, ..delta..K/sub 0/. Increasing the load ratio from R = 0.05 to 0.70 was found to lead to increased near-threshold growth rates, and a decrease in the threshold stress intensity. Similarly, increasing material strength, by varying the microstructure through quench and tempering and isothermal transformation, resulted in higher near-threshold growth rates, and a marked reduction of ..delta..K/sub 0/. These effects are contrasted with behavior at higher growth rates. The infuence of strength on ..delta..K/sub 0/ is rationalized in terms of the cyclic hardening or softening response of the material, and hence it is shown that cyclic softening can be beneficial to fatigue crack propagation resistance at very low growth rates. The results are discussed in the light of crack closure and environmental contributions to fatigue crack growth at low stress intensities.
140 citations
TL;DR: In this article, a strip crack closure model based on the original Dugdale-Barenblatt model was investigated for various aspects of fatigue crack growth behavior, and a variable constraint factor was introduced into the model to account for the 3D effect at the crack tip.
140 citations
TL;DR: By means of the theory of nonlocal elasticity, the stress concentration at the tip of a crack subjected to a uniform tension perpendicular to the line of crack at infinity was determined in this paper.
140 citations