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, the authors explored the nucleation and growth of cracks in filled natural rubber and found that a small positive R ratio can have a significant beneficial effect on fatigue life and crack growth rate, particularly at low strain range.
Abstract: Rubber components subjected to fluctuating loads often fail due to nucleation and the growth of defects or cracks. The prevention of such failures depends upon an understanding of the mechanics underlying the failure process. This investigation explores the nucleation and growth of cracks in filled natural rubber. Both fatigue macro-crack nucleation as well as fatigue crack growth experiments were conducted using simple tension and planar tension specimens, respectively. Crack nucleation as well as crack growth life prediction analysis approaches were used to correlate the experimental data. Several aspects of the fatigue process, such as failure mode and the effects of R ratio (minimum strain) on fatigue life, are also discussed. It is shown that a small positive R ratio can have a significant beneficial effect on fatigue life and crack growth rate, particularly at low strain range.
87 citations
TL;DR: In this article, a two-parameter fatigue crack growth model based on the local stress-strain material behaviour at the crack tip was used to account for the variable amplitude loading effects.
87 citations
01 Nov 1983
TL;DR: In this paper, the authors reviewed and modeled various sources of crack closure induced by cyclic plasticity, corrosion deposits, irregular fracture morphologies, viscous fluids and metallurgical phase transformations.
Abstract: In recent years, mechanistic and continuum studies on fatigue crack propagation, particularly at near-threshold levels, have highlighted a dominant role of crack closure in influencing growth rate behavior In this paper we review and model the various sources of closure induced by cyclic plasticity, corrosion deposits, irregular fracture morphologies, viscous fluids and metallurgical phase transformations It is shown that many of the commonly observed effects of mechanical factors, such as load ratio, microstructural factors, such as strength and grain size, and certain environmental conditions can be traced to the extrinsic influence of closure in modifying the effective driving force for crack extension The implications of such closure mechanisms are discussed in the light of constant and variable amplitude fatigue behavior, the existence of a threshold stress intensity for no fatigue crack growth and the validity of such threshold concepts for the case of short fatigue cracks 106 references, 21 figures
87 citations
TL;DR: In this article, a simple and efficient approach based on extended finite element method (XFEM) has been presented to simulate three-dimensional fatigue crack growth simulations, in which a crack front has been divided into many piecewise curve crack segments to avoid an iterative solution.
87 citations
TL;DR: In this article, the mode I fatigue crack propagation (FCP) response of the closed-cell aluminium alloy foams Alulight and Alporas has been measured for a relative density in the range 0.1 to 0.4.
87 citations