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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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TL;DR: In this article, an energy-based method of local elastic-plastic stress and strain calculation is presented, where the theoretical stress concentration factor k t can be related to the unit elastic strain energy at a notch root.
418 citations
TL;DR: In this paper, a study of residual stress effects in the mechanics of median fracture in sharp indenter contact is made, and the authors show that the residual component of the indentation field may actually cause the median crack to continue in downward extension as the indenter is withdrawn, a response which is especially amenable to experimental investigation.
Abstract: A study is made of residual stress effects in the mechanics of median fracture in sharp indenter contact. Starting with a simplistic treatment of the elastic-plastic indentation field, the problem is conveniently resolved into two separable parts, involving reversible (elastic) and irreversible (residual) components. The assumption of geometrical similarity in the residual field about the deformation zone, later backed up by stress birefringence measurements, leads to a stress intensity factor for median crack propagation containing the elastic and residual parts as the sum of two terms. The resulting formulation for equilibrium fracture shows some differences in the crack response during the loading and unloading half-cycles. By imposing certain stress states on the specimen surface during indentation the residual component of the field may actually cause the median crack to continue in downward extension as the indenter is withdrawn, a response which is especially amenable to experimental investigation. Direct observations of median crack evolution in soda-lime glass confirm this and other essential predictions of the fracture mechanics theory. The contribution of the residual component to the crack growth is found to be by no means secondary in importance to that of the elastic component.
414 citations
TL;DR: In this work the mechanical response to external applied loads of a new glass fibre reinforced endodontic post is simulated by finite element (FE) analysis of a bidimensional model to avoid edges that could act as undesired stress concentrators.
408 citations
TL;DR: In this paper, the effects of non-metallic inclusions on the fatigue strength of metals are reviewed and the major factors involved are discussed and the equations for the prediction of the threshold stress intensity factor range, ΔK th, and the fatigue limit, σ w, for defects and small cracks were extended to predict those for inclusions contained in high strength steels.
403 citations
TL;DR: In this paper, a closed-form solution for the 2D elastic stress field is adapted for reduced loading configurations modeled in a recently constructed fretting fatigue experiment that applies loads relevant to aircraft lap joints.
402 citations