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首页> 外文期刊>The Journal of Strain Analysis for Engineering Design >Finite element analysis of interface cracks using multiple point constraints
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Finite element analysis of interface cracks using multiple point constraints

机译:使用多点约束的界面裂纹的有限元分析

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摘要

A finite element technique to analyse closed-mode interface cracks is proposed in this study. Stress boundary conditions for a closed-tip model are transformed into multiple point constraints (MPCs) for nodal displacements. These constraints are imposed upon the finite element solutions to simulate closed-tip stress fields in crack-tip elements. This technique can deal with small as well as large crack-tip contact zones, and no special elements other than the standard quarter-point elements are needed. Since stresses approach infinity at the crack tip in a quarter-point element, dominant terms are used in deriving MPCs for nodal displacements. Fracture parameters are obtained by using the virtual crack extension method, and numerical results are in good agreement with analytical results.
机译:这项研究提出了一种有限元技术来分析闭模界面裂纹。闭端模型的应力边界条件转换为节点位移的多点约束(MPC)。这些约束被施加到有限元解上,以模拟裂纹尖端单元中的闭合尖端应力场。该技术可以处理大小裂纹尖端的接触区域,而除了标准的四分之一点元素以外,不需要其他特殊元素。由于应力在四分之一点的裂纹尖端处接近无穷大,因此在推导节点位移的MPC时使用了主导项。通过虚拟裂纹扩展方法获得断裂参数,数值结果与分析结果吻合良好。

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