Dynamic crack arrest analysis by ordinary state-based peridynamics
Dynamic crack arrest analysis by ordinary state-based peridynamics
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DOI：
10.1007/s10704-019-00416-3
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发表时间：
2020-01
影响因子：
2.5
通讯作者：
M. Imachi;Satoyuki Tanaka;M. Ozdemir;T. Bui;S. Oterkus;E. Oterkus
中科院分区：
文献类型：
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作者：
M. Imachi;Satoyuki Tanaka;M. Ozdemir;T. Bui;S. Oterkus;E. Oterkus
对裂纹止裂现象进行了动态断裂分析，采用了基于状态的动力学方程和过渡键概念的离散化方法。本文选取了双悬臂梁试件进行数值验证。分析包括两个主要阶段，即产生阶段和应用(预测)阶段。在裂纹萌生阶段，对于给定的裂纹路径历史，用该公式估算了扩展裂纹和止裂裂纹的动应力强度因子，得到了较好的一致性。在使用阶段，动态应力强度因子和止裂后的总裂纹长度与实验结果吻合较好。此外，还研究了过渡键概念对裂纹止裂行为的影响，发现过渡键在模拟裂纹止裂问题时是非常有效的，因此在没有过渡键的情况下可以观察到裂纹的过早止裂。
Dynamic fracture analysis for the crack arrest phenomenon is performed by ordinary state-based peridynamics formulation and discretization employing transition bond concept. Double cantilever beam specimen is chosen for our numerical evidence purpose. The analysis consists of two main phases namely, generation and application (prediction) phases. In the generation phase, the dynamic stress intensity factors of propagating and arrested cracks are estimated by the present formulation for given crack path histories, and a good agreement is achieved. As for the application phase, dynamic stress intensity factors as well as total crack lengths after crack arrests are in good agreement with the experiments. Moreover, the influence of transition bond concept on the crack arrest behavior is investigated and it is found that the transition bond is very efficient in the simulation of the crack arrest problem such that premature arrests of cracks are observed without transition bond cases.