An XFEM/CZM based inverse method for identification of composite failure parameters
An XFEM/CZM based inverse method for identification of composite failure parameters
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DOI：
10.1016/j.compstruc.2015.02.035
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发表时间：
2015-06-01
影响因子：
4.7
通讯作者：
Natarajan, Sundararajan
中科院分区：
文献类型：
--
作者：
Bouhala, Lyazid;Makradi, Ahmed;Natarajan, Sundararajan
提出了一种识别单向碳/环氧复合材料I型失效参数，即临界应变能释放率(G(IC))和强度(Sigma(C))的实验-数值方法。采用反分析方法，将双悬臂梁(DCB)试验结果与相应的扩展有限元(XFE)粘结区模型(CZM)相结合。在所建立的数值模型中，缺口和裂纹路径由水平集函数隐式定位和丰富，裂纹扩展受双线性内聚定律控制。代价函数考虑了数值结果和实验结果之间的误差，并通过更新两个独立参数的值使其在最小二乘意义下最小化。然后将确定的临界应变能释放率与修正梁理论(CBT)得到的临界应变能释放率进行比较，并将识别的强度与实验估计的强度进行比较。从整体上看，结果是非常一致的，所提出的方法似乎是有效的，以准确地确定复合材料的破坏参数。(C)2015爱思唯尔有限公司。保留所有权利。
An experimental-numerical methodology for identification of mode I failure parameters, namely the critical strain energy release rate (G(Ic)) and the strength (sigma(c)) of unidirectional carbon/epoxy composite is proposed. Using an inverse procedure, the experimental results of a double cantilever beam (DCB) test are used in conjunction with a counterpart extended finite element method (XFEM) cohesive zone model (CZM). In the developed numerical model, the notch and the crack path are located and enriched implicitly by a level set function and the crack propagation is controlled by a bi-linear cohesive law. The cost function accounts for the error between the numerical and the experimental results, and it is minimised in a least squares sense by updating the values of the two independent parameters. The determined critical strain energy release rate is then compared with the one obtained using the corrected beam theory (CBT), and the identified strength is compared with the one estimated experimentally. Globally, the results are very well in agreement and the proposed methodology seems to be efficient to determine accurately the composite failure parameters. (C) 2015 Elsevier Ltd. All rights reserved.