Analysis of three-dimensional interface cracks using enriched finite elements
Analysis of three-dimensional interface cracks using enriched finite elements
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DOI：
10.1007/s10704-006-9040-7
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发表时间：
2007-01
影响因子：
2.5
通讯作者：
A. Ayhan;A. Kaya;H. F. Nied
中科院分区：
文献类型：
--
作者：
A. Ayhan;A. Kaya;H. F. Nied
许多重要的界面裂纹问题本质上是三维的，例如，层压结构在拐角和孔处的剥离。为了准确地分析三维界面断裂问题，开发了一种有效的计算技术，利用丰富的裂纹尖端元素包含正确的界面裂纹尖端渐近行为。在丰富的元素配方，应力强度因子KI，KII和KIII被视为额外的自由度，并直接在有限元求解阶段获得。在这项研究中，结果应该是最感兴趣的半圆形表面和四分之一圆角裂纹。解决方案产生均匀的远程张力和均匀的热负荷，在广泛的双材料组合。特别感兴趣的是自由表面效应，和Dundurs的材料参数的应变能释放率的大小和相应的相位角的影响。
Many important interface crack problems are inherently three-dimensional in nature, e.g., debonding of laminated structures at corners and holes. In an effort to accurately analyze three-dimensional interface fracture problems, an efficient computational technique was developed that utilizes enriched crack tip elements containing the correct interface crack tip asymptotic behavior. In the enriched element formulation, the stress intensity factorsKI,KII, andKIIIare treated as additional degrees of freedom and are obtained directly during the finite element solution phase. In this study, the results that should be of greatest interest are obtained for semi-circular surface and quarter-circular corner cracks. Solutions are generated for uniform remote tension and uniform thermal loading, over a wide range of bimaterial combinations. Of particular interest are the free surface effects, and the influence of Dundurs’ material parameters on the strain energy release rate magnitudes and corresponding phase angles.