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J-integral Evaluation from Displacement Fields around Crack Tip Measured by Digital Image Correlation

机译:数字图像相关性测量裂纹尖端周围位移场的 J 积分评估

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摘要

In this paper, a method for evaluating J -integral for displacement fields obtained by digital image correlation (DIC) is proposed. First, the displacement gradient and strain are determined from the displacement using a least squares method on the domain of integration. Next, the stress components are determined from the strain using the Newton-Raphson method and material properties. Finally, the J -integral value is determined by the numerical integration on the domain of integration. The usefulness of this evaluation method is verified by applying this method to the displacement field obtained from the elasticplastic finite element analysis, and by applying to the experimental displacement field obtained by DIC.
机译:本文提出了一种评估数字图像相关性(DIC)获得的位移场的J积分的方法。首先,在积分域上使用最小二乘法从位移确定位移梯度和应变。接下来,使用牛顿-拉夫森方法和材料特性从应变中确定应力分量。最终,通过积分域上的数值积分来确定积分值。通过将该方法应用于从弹塑性有限元分析获得的位移场,以及应用于通过DIC获得的实验位移场,可以验证该评估方法的有效性。

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