An inverse analysis of cohesive zone model parameter values for ductile crack growth simulations
An inverse analysis of cohesive zone model parameter values for ductile crack growth simulations
复制标题
DOI：
10.1016/j.ijmecsci.2013.12.006
复制
发表时间：
2014-02-01
影响因子：
7.3
通讯作者：
Zavattieri, Pablo
中科院分区：
文献类型：
--
作者：
Chen, Xin;Deng, Xiaomin;Zavattieri, Pablo
采用改进的Levenberg-MarQuardt方法进行反分析，确定了用于对2024-T3铝合金Arcan试件的稳态撕裂裂纹扩展事件进行三维有限元模拟的粘聚区模型参数值。数值模拟中采用了三角形内聚力定律。在反分析中，通过最小化荷载-裂缝扩展曲线上关键点的模拟预测与实验测量之间的差异来确定粘结参数值。从三个不同的初始值，可以得到相似的内聚参数值集。利用这组数值，对复合型加载情况下的载荷-裂纹扩展曲线和广义裂纹尖端张开位移(CTOD)随裂纹扩展的变化情况与实验测量结果进行了比较，验证了内聚力参数值和有限元模拟预测的正确性。(C)2013爱思唯尔有限公司。保留所有权利。
An inverse analysis using a modified Levenberg-Marquardt method is carried out to identify cohesive zone model parameter values for use in 3D finite element simulations of stable tearing crack growth events in Arcan specimens made of 2024-T3 aluminum alloy. The triangular cohesive law is employed in the simulations. The set of cohesive parameter values is determined in the inverse analysis by minimizing the difference between simulation predictions of key points on the load-crack extension curve with experimental measurements. From three different initial values, similar cohesive parameter value sets are reached. Using these sets of values, the predicted load-crack extension curves and the variation of a generalized crack tip opening displacement (CTOD) with crack extension for mixed-mode loading cases are compared with experimental measurements, which provide a validation of the cohesive parameter values and of the finite element simulation predictions. (C) 2013 Elsevier Ltd. All rights reserved.