Topic
Crack closure
About: Crack closure is a research topic. Over the lifetime, 28157 publications have been published within this topic receiving 588158 citations.
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TL;DR: In this paper, the effect of particle/matrix adhesion on crack propagation in an epoxy resin reinforced with spherical glass particles was investigated in terms of crack pinning and blunting.
Abstract: The investigation outlined in the preceding paper has been extended to cover the effect of particle/matrix adhesion upon crack propagation in an epoxy resin reinforced with spherical glass particles. The behaviour has again been interpreted in terms of crack pinning and blunting. It has again been shown that in the absence of blunting a critical crack opening displacement criterion can be applied. The strength of the particle/matrix interface is found to affect both the crack propagation behaviour and the appearance of the fracture surface. It is also found to have a profound effect upon the fracture strength of the composites. The best overall mechanical properties are obtained for composites containing particles treated with coupling agent.
336 citations
TL;DR: In this article, a crystallographic model is proposed which takes into account both crack-plane twist and tilt effects on crack retardation at grain boundaries, and studies of short fatigue crack growth in an Al-Li 8090 alloy plate provide evidence that supports the model.
336 citations
TL;DR: In this paper, the grain boundary distributions were analyzed with special emphasis on grain boundary character along intergranular stress corrosion cracks and at crack arrest points, and it was established that only coherent twin Σ3 boundaries could be considered as special boundaries with regard to crack resistance.
335 citations
TL;DR: In this paper, a fracture mechanics approach employing the concept of crack opening displacement for application to situations in which linear elastic fracture mechanics is invalidated by yielding is given, and the hypothesis of critical crack opening opening displacement to fracture has been examined experimentally using mild steel specimens of vastly differing dimensions.
Abstract: An introduction is given to the fracture mechanics approach employing the concept of crack opening displacement for application to situations in which linear elastic fracture mechanics is invalidated by yielding. The hypothesis of a critical crack opening displacement to fracture has been examined experimentally using mild steel specimens of vastly differing dimensions. Subsidiary experiments have been carried out to define the factors responsible for the apparent effect of absolute size on the results. A theoretical analysis simulates elastic-plastic conditions to give a relationship between applied stresses and strains, crack length, and crack opening displacement.
333 citations
TL;DR: In this article, the failure of materials due to slow crack growth, under dynamic loading conditions, is analyzed in terms of crack velocity, stress intensity relationships, and it is shown that this type of analysis can fully describe the failure characteristics for both constant strain-rate and constant stress-rate loading.
Abstract: The failure of materials due to slow crack growth, under dynamic loading conditions, is analyzed in terms of crack velocity, stress intensity relationships. It is shown that this type of analysis can fully describe the failure characteristics for both constant strain-rate and constant stress-rate loading. The analysis is used to predict the variations of strength and subcritical crack growth with strain-rate and stress-rate. Application of the analysis to several ceramic systems give data which are entirely consistent with available experimental data.
333 citations