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 article, a qualitative mechanism involving cavitation, shear yielding and plastic flow was proposed to calculate values of the crack opening displacement and the correlations established between stress intensity factor, KIc, yield stress and type of crack growth suggest that the extent of crack tip blunting largely governs the relative toughness of the epoxy materials.
310 citations
TL;DR: In this article, the growth of the fatigue cracks initiated by the slit were made as the test proceeded, and it was found that the rate of growth was proportional to the current crack length.
Abstract: Fatigue tests have been carried out on mild steel, aluminium alloy and copper sheet specimens containing a small central slit. Measurements of the growth of the fatigue cracks initiated by the slit were made as the test proceeded. In some of the mild steel specimens a plastic zone was visible around the growing crack. Measurements of the plastic zone were made whenever possible and these showed that a state of geometrical similarity existed between the crack length and plastic zone dimensions. For low stresses the crack growth was sometimes erratic, but while the growth was steady and the overall crack length less than about one eighth of the specimen width it was found that the rate of growth was proportional to the current crack length. The effect of mean stress is discussed.
309 citations
TL;DR: In this article, a combined fracture-plastic model for concrete is presented, which combines the fracture model and the crack band approach. And the model can be used to simulate concrete cracking, crushing under high confinement and crack closure due to crushing in other material directions.
309 citations
01 Jan 1986
TL;DR: In this paper, the authors compared the fracture behavior of normal weight and lightweight concrete with respect to their envelope curves, material stiffness and degradation during post-peak cycles, and residual compressive deformation on crack closure.
Abstract: For modelling fracture behaviour of concrete various types of deformation controlled uniaxial tests were performed on normal weight and on lightweight concrete. These two types of concrete were compared with respect to their envelope curves, material stiffness and degradation during post-peak cycles, and residual compressive deformation on crack closure. Differences in behaviour were explained on the basis of the properties of the aggregates which result in specific fracture surfaces. Based on narrow specimens with uniform stress distribution, unique stress deformation curves were determined and the descending branches were modelled. These models were applied to calculate the stress distribution in wide specimens with a sawcut. The total force was in good agreement with the experiment. Probable reasons for the different behaviour of lightweight and normalweight concrete are discussed.
307 citations
TL;DR: In this paper, the authors studied the mechanical fatigue of NiTi shape memory alloys and found that the fatigue limit is lower than predicted from the phenomenological law relating growth rates to the elastic modulus.
304 citations