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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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Journal ArticleDOI
TL;DR: In this paper, the authors investigated the hydrogen embrittlement of a Fe 18Mn-1.2%C (wt.%) twinning-induced plasticity steel, focusing on the influence of deformation twins on hydrogen-assisted cracking.

195 citations

Journal ArticleDOI
R. J. Donahue1, H. McI Clark1, P. Atanmo1, R. Kumble1, A. J. McEvily1 
TL;DR: In this article, the authors used a direct proportionality between the rate of fatigue crack growth and crack opening displacement above a threshold, and showed that fatigue crack data for a wide variety of different materials can be accurately described in terms of the mechanical properties and two material constants.
Abstract: Using a direct proportionality between the rate of fatigue crack growth and crack opening displacement above a threshold, it is shown that fatigue crack growth data for a wide variety of different materials can be accurately described in terms of the mechanical properties and two material constants; the constant of proportionality A and the threshold stress intensity factorKth. Some 65 sets of data for tests atR ≅ 0 were analysed by computer and it is shown that the approach is valid to growth rates up to about 10−4 in./cycle, i.e. until the onset of crack propagation by dimple formation. It is found thatA can be related to the yield strain for crack growth in non-aggressive environments, and is increased by increasingly severe environments, whileKth is decreased. These changes provide a measure of the severity of the environment. Crack growth rate in non-aggressive environments is shown to be independent of the yield stress and proportional to the strain intensity factor above the threshold. The tabulation ofA andKth values as a function of material, environment and loading conditions provides a systematic engineering approach to estimating rates of fatigue crack growth and in determining the residual lifetimes of flawed structures.

194 citations

Journal ArticleDOI
TL;DR: In this paper, a 3D sequentially coupled finite element (FE) model was developed to investigate the thermomechanical responses in the selective laser melting (SLM) process, and the model was applied to test different scanning strategies and evaluate their effects on part temperature, stress and deformation.
Abstract: Selective laser melting (SLM) has emerged as one of the primary metal additive manufacturing technologies used for many applications in various industries such as medical and aerospace sectors. However, defects such as part distortion and delamination resulted from process-induced residual stresses are still one of the key challenges that hinder widespread adoptions of SLM. For process parameters, the laser beam scanning path will affect the thermomechanical behaviors of the build part, and thus, altering the scanning pattern may be a possible strategy to reduce residual stresses and deformations through influencing the heat intensity input distributions. In this study, a 3D sequentially coupled finite element (FE) model was developed to investigate the thermomechanical responses in the SLM process. The model was applied to test different scanning strategies and evaluate their effects on part temperature, stress and deformation. The major results are summarized as follows. (1) Among all cases tested, the out-in scanning pattern has the maximum stresses along the X and Y directions; while the 45° inclined line scanning may reduce residual stresses in both directions. (2) Large directional stress differences can be generated by the horizontal line scanning strategy. (3) X and Y directional stress concentrations are shown around the edge of the deposited layers and the interface between the deposited layers and the substrate for all cases. (4) The 45° inclined line scanning case also has a smaller build direction deformation than other cases.

194 citations

Journal ArticleDOI
TL;DR: In this article, a cohesive zone model for fatigue crack initiation and growth in quasibrittle materials is proposed, where the softening material in the cohesive zone and cracks are modeled as internal singular surfaces in the elastic body.

193 citations


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Performance
Metrics
No. of papers in the topic in previous years
YearPapers
202373
2022220
2021628
2020642
2019608
2018581