On validating peridynamic models and a phase-field model for dynamic brittle fracture in glass
On validating peridynamic models and a phase-field model for dynamic brittle fracture in glass
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DOI：
10.1016/j.engfracmech.2020.107355
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发表时间：
2020-12
影响因子：
5.4
通讯作者：
J. Mehrmashhadi;M. Bahadori;F. Bobaru
中科院分区：
文献类型：
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作者：
J. Mehrmashhadi;M. Bahadori;F. Bobaru
我们对两个动力学模型和一个相场模型进行了检验，并与最近关于冲击引起的玻璃动态断裂/裂纹分叉的实验结果进行了对比。我们发现两种动力学模型(一种使用无网格离散，另一种是LS-DYNA的间断Galerkin实现)和相场模型的结果有很大的不同。我们监测了裂纹的分叉位置、分叉角度、裂纹扩展速度的时间分布，以及实验观察到的一些细微特征：裂纹路径在其末端附近的小扭曲/扭结。这些结果为选择最合适的解决玻璃动态脆性断裂的方法提供了指导，并解释了一些模型失败的可能原因，从而正确地预测了观察到的行为。
We test two peridynamic models and one phase field model against recent experimental tests on dynamic fracture/crack branching in glass induced by impact. We find important differences in results among the two peridynamic models (one using the meshfree discretization, the other being the LS-DYNA’s discontinuous-Galerkin implementation) and the phase-field model. We monitor the crack branching location, angle of crack branching, the time-profile of crack propagation speed, and some fine features seen experimentally: small twists/kinks in the crack paths near their end. The results shown here provide guidance in selecting the most appropriate solution method for dynamic brittle fracture in glass and explain likely reasons behind the failure of some of the models to correctly predict the observed behavior.