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 paper, the authors investigated the effect of the self-same epoxy interlayer on the interlaminar fracture properties under modes I and II loadings on the bases of the fractographic observations and mechanism considerations.
232 citations
TL;DR: In this article, the role of roughness-induced crack closure in plane strain was investigated and it was shown that coarse grain sizes can reduce near-threshold crack growth rates at low load ratios.
Abstract: It is noted that at near-threshold levels, in addition to the role of plasticity-and oxide-induced crackclosure, fracture surface roughness or morphology may promote significant closure effects in plane strain, as similarly noted by Minakawa and McEvily.This is considered to result from the fact that, where maximum plastic zones sizes are small compared to the grain size, fatigue crack growth proceeds by a single shear decohesion mechanism (Stage I) with associated Mode II+I displacements. The resulting serrated or faceted fracture surfaces (“microstructurally-sensitive growth”) coupled with Mode II crack tip displacements thus induce high closure loads (i.e., K
cl/K
max ~0.5) by wedging the crack open at discrete contact points. At higher growth rates where the plastic zone encompasses many grains, striation growthvia alternating or simultaneous shear mechanisms (Stage II) produces a more planar fracture surface, with pure Mode I displacements, and a corresponding reduction in closure loads. Such concepts of roughness-induced closure are shown to be consistent with observations of the role of coarse grain sizes in reducing near-threshold crack growth rates at low load ratios and of the absence of this effect at high load ratios.
231 citations
TL;DR: In this article, a three-dimensional cohesive element and a class of irreversible cohesive laws were developed to enable the accurate and efficient tracking of three dimensional fatigue crack fronts and the calculation of the attendant fatigue life curves.
223 citations
TL;DR: In this article, the authors developed a predictive capability for the quantitative assessment of crack growth under fatigue loadings, which can be applied expediently to examine the combined influence of crack geometry, complex loadings and material properties.
223 citations
TL;DR: In this paper, a micro-roughness model was proposed to rationalize fatigue crack growth retardation due to load excursions, and it was argued that crack closure arising from residual tensile displacements is not the primary mechanism for growth attenuation following a peak tensile overload.
223 citations