Topic
Paris' law
About: Paris' law is a research topic. Over the lifetime, 13815 publications have been published within this topic receiving 224818 citations. The topic is also known as: Paris-Erdogan law.
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13 May 2013
TL;DR: Generalised Neuber Concept of Fictitious Notch Rounding and Extended Stress Intensity Factor Concepts as discussed by the authors were used to describe local strain energy density concept and Elastic-Plastic Fatigue Crack Growth.
Abstract: Generalised Neuber Concept of Fictitious Notch Rounding.- Extended Stress Intensity Factor Concepts.- Local Strain Energy Density Concept.- Elastic-Plastic Fatigue Crack Growth.
85 citations
TL;DR: In this paper, a time-dependent reliability estimation procedure that combines the determined crack growth model with interval mathematics is presented as a theoretical basis for structural damage tolerance design, in which a new measure index of non-probabilistic timedependent reliability is proposed as a feasible way for precisely evaluating the safe life of in-service engineering structures with crack.
85 citations
TL;DR: In this paper, a compelling finite element framework to model hydrogen assisted fatigue by means of a hydrogen-and cycle-dependent cohesive zone formulation is presented, where the role of yield strength, work hardening, and constraint conditions in enhancing crack growth rates as a function of the loading frequency is thoroughly investigated.
85 citations
01 Jan 1988
TL;DR: In this paper, a three-dimensional elastic-plastic finite-element analysis of crack growth and closure under cyclic loading has been performed in order to investigate the behavior of a crack in a finite-thickness middle-crack tension specimen.
Abstract: A three-dimensional elastic-plastic finite-element analysis of crack growth and closure under cyclic loading has been performed in order to investigate the behavior of a crack in a finite-thickness middle-crack tension specimen. The cases of both constant-amplitude loading and a single-spike overload are considered. The calculated crack-opening stresses for the exterior of the specimen agree with previous plane-stress results, and those obtained for the interior of the specimen agree with previous plane-strain results.
85 citations
TL;DR: In this paper, a self-consistent theory has been developed to account for the variation in fatigue crack growth rates with load ratio,R, without reference to crack closure concepts, and the entire fatigue crack behavior was classified into five different classes using the experimental ΔKth-R data.
Abstract: A self-consistent theory has been developed to account for the variation in fatigue crack growth rates with load ratio,R, without reference to crack closure concepts. The theory states that (a) for an unambiguous description of cyclic damage, two loading parameters are required; (b) consequently, there are two thresholds corresponding to each parameter that must be satisfied for a crack to grow; (c) these two thresholds are intrinsic and are independent of specimen geometry; (d) a fundamental threshold curve can be developed that is independent of test methods defining these two thresholds from the asymptotic values, and last; (e) the two thresholds vary with the degree of slip planarity, microstructure, and environment. Based on these new concepts, we have classified the entire fatigue crack growth behavior into five different classes using the experimental ΔKth-R data. The characteristic feature of each class is discussed, and the supporting examples of materials behavior are provided. This classification could provide a basis for understanding the synergistic effects of mechanical and chemical driving forces and microstructure contributing to fatigue crack growth.
85 citations