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An efficient approach to the modeling of compressive transverse cracking in composite laminates

机译：复合材料层压板压缩横向裂纹建模的有效方法

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A wedge-shaped failure mechanism occurs when a composite ply in a laminate is loaded under transverse compression. Therefore failure models developed for tension are not straightforwardly applicable to compression. For models that represent matrix cracks as discontinuities, the inclined crack topology complicates algorithms considerably. In this paper, a method is introduced to approximate the behavior of inclined cracks while avoiding these complications. Rather than adapting the crack topology, a transformation is applied in the evaluation of the cohesive law. The method is applied on predefined interface elements in a 2D model, as well as on cohesive segments in the extended finite element method in a 3D model. It is found that the compressive failure of composite laminates including the wedge effect can be approximated accurately with this method using a vertical crack plane. In 3D, a variable fracture plane angle is taken into account with the method, which means that the whole range of failure modes, from tensile through shear-dominated to compressive failure can be covered in a single approach. (C) 2015 Elsevier Ltd. All rights reserved.
机译：当层压材料中的复合层板在横向压缩下加载时，会发生楔形破坏机制。因此，为拉力而开发的失效模型不能直接应用于压缩。对于将矩阵裂纹表示为不连续的模型，倾斜裂纹拓扑使算法变得相当复杂。在本文中，介绍了一种在避免这些复杂情况的同时近似倾斜裂缝行为的方法。与其适应裂纹拓扑，不如对内聚规律进行评估。该方法适用于2D模型中的预定义界面元素，以及3D模型中扩展有​​限元方法中的内聚段。已经发现，使用垂直裂纹平面的这种方法可以精确地估计包括楔形效应的复合层压板的压缩破坏。在3D中，该方法考虑了可变的断裂平面角度，这意味着可以用一种方法涵盖从拉伸，剪切为主到压缩破坏的整个破坏模式。 （C）2015 Elsevier Ltd.保留所有权利。

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