A computational approach based on ordinary state-based peridynamics with new transition bond for dynamic fracture analysis
A computational approach based on ordinary state-based peridynamics with new transition bond for dynamic fracture analysis
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DOI：
10.1016/j.engfracmech.2018.11.054
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发表时间：
2019-02-01
影响因子：
5.4
通讯作者：
Oterkus, Erkan
中科院分区：
文献类型：
--
作者：
Imachi, Michiya;Tanaka, Satoyuki;Oterkus, Erkan
最近开发的普通基于状态的近场动力学（OSPD）进一步增强，以研究基于动态应力强度因子（DSIF）的弹性动力传播裂纹。诸如裂纹表面之类的位移不连续性由粘合失败表示。通过动态裂纹扩展的相互作用积分方法评估混合模式 DSIF 随时间的变化。就 OSPD 断裂建模而言，DSIF 的数值振荡成为裂纹演化过程中的关键问题。为了克服这个数值振荡问题，我们引入了一种新的键失效模型，即过渡键。使用新的过渡键模型的增强型 OSPD 方法提供了准确且可接受的结果，抑制了响应的数值振荡并反映了一种有效的方法。对不同类型过渡键的影响进行了数值分析。使用各种阻尼参数检查 DSIF 的准确性，并验证新 PD 断裂模型的有效性。 Kalthoff-Winkler 冲击试验被考虑用于评估混合模式 DSIF 和裂纹路径。
The recently developed ordinary state-based peridynamics (OSPD) is further enhanced to study elastodynamic propagating crack based on the dynamic stress intensity factors (DSIFs). The displacement discontinuity such as a crack surface is represented by a bond-failure. Variations of the mixed-mode DSIFs with time are evaluated by the interaction integral method for the dynamic crack propagation. In terms of OSPD fracture modeling, numerical oscillation of DSIFs becomes a critical issue during the evolution of a crack. To overcome this numerical oscillation problem, we introduce a new model of bond-failure, the transition bond. The enhanced OSPD approach using the new transition bond model offers accurate and acceptable results, suppressing the numerical oscillation of responses and reflecting an effective approach. The effects of different types of transition bond are numerically analyzed. Accuracy of the DSIFs is examined employing the various damping parameters and effectiveness of the new PD fracture model is verified. The Kalthoff-Winkler impact test is considered for evaluating the mixed-mode DSIFs and the crack paths.