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A parametric study assessing performance of extended Finite Element Method in application to the cracking process in cross-ply composite laminates

机译：评估扩展有限元方法在交叉复合层压板开裂过程中的性能的参数研究

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The eXtended Finite Element Method (XFEM) allows modelling of the onset and propagation of multiple cracks in a material without prior assumption on their positions. In the current work, the method is examined for its capability to predict matrix cracking in cross-ply composite laminates under quasi-static tensile loading - a phenomenon that is well understood in the field. The study is performed using commercially available ABAQUS tools and focuses on the effect of numerical and physical parameters. The propagation of transverse cracks and delaminations is described by cohesive laws. XFEM predicts physically sound evolution of crack densities in function of the applied load if input data, such as the transverse strength (including statistical parameters of its distribution) and critical energy release rate characteristics in the cohesive laws, are correctly prescribed. These input parameters are difficult to determine experimentally, and their choice may be controversial. The paper investigates the influence of these parameters on the crack development history and discusses issues in their choice.
机译：扩展有限元方法（XFEM）可以对材料中多个裂纹的发生和扩展进行建模，而无需事先假设其位置。在当前的工作中，研究了该方法在准静态拉伸载荷下预测交叉复合复合材料中基体开裂的能力，这一现象在本领域已广为人知。这项研究是使用可商购的ABAQUS工具进行的，着重于数值和物理参数的影响。横向裂纹和分层的扩展由内聚定律描述。如果正确规定了输入数据（例如横向强度（包括其分布的统计参数）和内聚规律中的临界能量释放速率特征），则XFEM会根据施加的载荷来预测裂纹密度的物理变化。这些输入参数很难通过实验确定，它们的选择可能会引起争议。本文研究了这些参数对裂纹发展历程的影响，并讨论了这些参数的选择问题。

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