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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TL;DR: In this article, a new approach to the correlation between coefficient and exponent in the power law equation of fatigue crack growth is outlined. And it is shown that the correlation is an algebraic one that can be suppressed by choosing a particular scaling factor characteristic of the set of materials under investigation.
88 citations
TL;DR: In this paper, the authors used the finite element method to determine the strain-energy release rate of a fatigue crack growing along the first ply of a double-lap composite and showed that fatigue failure is mainly driven by tensile mode loading due to the peel stress.
88 citations
TL;DR: In this paper, the authors investigated the cohesive stress transfer during the sub-critical crack growth associated with the debonding of FRP from concrete under fatigue loading using the direct shear test set-up.
Abstract: The cohesive stress transfer during the sub-critical crack growth associated with the debonding of FRP from concrete under fatigue loading is experimentally investigated using the direct shear test set-up. The study focused on high-amplitude/low-cycle fatigue. The fatigue sub-critical crack growth occurs at a load that is smaller than the static bond capacity of the interface, obtained from monotonic quasi-static loading, and is also associated with a smaller value of the interfacial fracture energy. The strain distribution during debonding is obtained using digital image correlation. The results indicate that the strain distribution along the FRP during fatigue is similar to the strain distribution during debonding under monotonic quasi-static loading. The cohesive crack model and the shape of the strain distribution adopted for quasi-static monotonic loading is indirectly proven to be adequate to describe the stress transfer during fatigue loading. The length of the stress transfer zone during fatigue is observed to be smaller than the cohesive zone of the interfacial crack under quasi-static monotonic loading. The strain distribution across the width of the FRP sheet is not altered during and by fatigue loading. A new formulation to predict the debonding crack growth during fatigue is proposed.
88 citations
TL;DR: In this article, the authors measured the growth rate of fatigue cracks in 12 variations of particulate silicon carbide reinforced aluminum alloy composites and found that they exhibited an approximately linear, or Paris law, region, fitting the function da/dN = BΔK s, and a threshold stress intensity factor, ΔK th.
88 citations
TL;DR: In this article, a survey of variable-amplausitude loading as applied in test programs is given, with an analysis of the consequences for prediction techniques. But the authors focus on the effects of variableamplitude loading on fatigue cracks.
Abstract: The paper starts with a discussion on loads in service, after which a survey is given of various types of variable-amplitude loading as applied in test programs. The various phenomenological aspects of fatigue damage associated with fatigue cracks are indicated. Interaction effects between cycles of different magnitudes are defined. Methods for measuring interaction effects, examples of interaction effects, and possible explanations are reviewed. This includes both tests with simple types of variable-amplitude loading (overloads and step loading) and more complex load-time histories (program loading, random load, and flight-simulation loading). New evidence on crack closure is presented. Various types of prediction methods are discussed. The paper is primarily a survey of the present knowledge, with an analysis of the consequences for prediction techniques.
88 citations