Predicting progressive delamination via interface elements
Predicting progressive delamination via interface elements
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通过界面元素预测渐进分层
DOI：
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发表时间：
2008
期刊：
影响因子：
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通讯作者：
S. Hallett
中科院分区：
文献类型：
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作者：
S. Hallett
本章回顾了界面单元发展的一些背景，并将其应用于复合材料的分层。界面单元是在有限元分析中模拟连续体之间的薄或零厚度层的单元。界面单元的位置本身不是裂纹路径的预测，而是潜在分层的平面，其可能失效或不失效取决于载荷和相关失效标准。对于层压复合材料，这种方法效果很好，因为可能分层的平面通常在层片之间或粘合剂粘合线处被很好地限定。荷载作用下的相对节点位移可分解为法向位移和剪切位移。法向分量代表模式I型裂纹张开，剪切代表模式II和III的组合，因为在不知道裂纹前缘方向的情况下无法区分这些。界面单元的本构关系基于牵引-位移定律，该定律通常在基于应力的失效标准（初始）之前是弹性的，然后经历软化行为，该软化行为描述了在完全失效（扩展）时等于临界断裂能（GC）的曲线下面积。
Publisher Summary This chapter reviews some of the background behind the development of interface elements with application to composites delamination. Interface elements are elements which model a thin or zero thickness layer between continua in a finite element analysis. The location of the interface elements are not themselves a prediction of the crack path but a plane of potential delamination which may or may not fail depending on the loading and the relevant failure criteria. For laminated composites this approach works well as the planes of possible delamination are generally well defined between the plies or at adhesive bond lines. The relative nodal displacements under an applied load can be separated out into normal and shearing components. The normal component represents a mode I type crack opening and the shearing a combination of mode II and III since these cannot be distinguished without knowledge of the direction of the crack front. The constitutive relation of the interface element is based on a traction-displacement law which is generally elastic up to a stress-based failure criterion (initiation) and then undergoes a softening behavior which describes an area under the curve equal to the critical fracture energy (GC) at complete failure (propagation).