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A stress intensity factor estimation method for kinked crack

机译:扭结裂纹的应力强度因子估计方法

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摘要

A method for estimating the stress intensity factors (SIFs) of kinked crack with finite kink length is presented. This method is based on an estimation expression which is derived by He et al. according to the work of Cotterell and Rice from the stress field series of the original (unkinked) crack tip to the second order by using weight function (WF). In order to increase the estimation accuracy for the kinked crack with finite kink length, the third order coefficients of the stress field series of the original crack tip are introduced into this expression and these parameters can be obtained by a fitting procedure. Application of this modified expression to the cases of singly-kinked, edge kinked and doubly-kinked cracks reveals a good approximation with the finite element (FE) results of SIFs and showed that the accuracy is increased. (C) 2017 Elsevier Ltd. All rights reserved.
机译:提出了一种用有限扭结长度估计扭结裂纹的应力强度因子(SIF)的方法。 该方法基于由He等人导出的估计表达式。 根据Cotterell和Rice从应力场系列的原始(未knked)裂缝尖端通过使用权重函数(wf)的裂缝尖端。 为了提高具有有限扭结长度的扭结裂缝的估计精度,将原裂纹尖端的应力场系列的三阶系数引入该表达式中,并且这些参数可以通过配件程序获得。 将这种改进的表达在单楔形,边缘扭结和双壁裂纹裂缝中的应用揭示了SIFS的有限元素(Fe)结果的良好近似,并显示了准确性。 (c)2017 Elsevier Ltd.保留所有权利。

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