通过孵化时间断裂准则的裂纹速度依赖性的近场动力学建模
Peridynamic modeling of the crack velocity dependence via an incubation time fracture criterion
AI总结：
本研究采用近场动力学方法，结合远程应力断裂准则与孵化时间断裂准则，模拟了Ravi-Chandar和Knauss的脆性Homalite-100聚合物板实验，揭示了裂纹扩展速度对瞬时应力强度因子的影响及高速下的微分支现象。
摘要：
本研究探讨了动态断裂力学的核心问题之一，即瞬时应力强度因子（SIF）对裂纹扩展速度的依赖性。为此，采用近场动力学方法对Ravi-Chandar和Knauss在脆性、无定形Homalite-100聚合物板上进行的著名实验进行了建模。数值模型将先前提出的远程应力断裂准则整合到孵化时间断裂准则中。数值模拟结果表明，在几乎恒定的裂纹扩展速度下，SIF值存在显著变化。此外，对于更高的裂纹扩展速度，数值上获得了微分支，导致SIF值出现更大的分散性。这些效应也在Ravi-Chandar和Knauss的实验中观察到，为I型SIF的裂纹速度依赖性的本质提供了新的见解。
英文摘要：
This study investigates one of the central problems of dynamic fracture mechanics, namely the dependence of the instantaneous stress intensity factor (SIF) on the crack propagation velocity. For this purpose, the well-known experiments by Ravi-Chandar and Knauss on brittle, amorphous Homalite-100 polymer plates are modeled using a peridynamic approach. The numerical model integrates the previously proposed remote stress fracture criterion into an incubation time fracture criterion. Results of numerical modeling indicate a significant variation in SIF values at an almost constant crack propagation velocity. Moreover, for higher crack propagation velocities, micro-branching is obtained numerically, leading to a larger scatter of SIF values. These effects were also observed in the experiments of Ravi-Chandar and Knauss, which provides new insights into the nature of the crack-velocity dependence of the Mode-I SIF.
机构、总结、中文摘要均由AI分析而来，可能存在错误，请以论文正文为准。
