Dynamic Fracture Analysis for Shale Material by Peridynamic Modelling

• 作者: Zhanqi Cheng Zhenyu Wang Zhongtao Luo
• 来源期刊: 工程与科学中的计算机建模(英文)
• 学科: 物理学
• 关键词: PERIDYNAMICS SHALE DYNAMIC FRACTURE CRACK PROPAGATION DYNAMIC loads
• 年，卷（期）: 2019,（3）
• 页码范围: 509-527
• 页数: 19页
• 分类号: O34

摘要

In this work,a bond-based peridynamics(PD)model was built to analyze the dynamic fracture of shale material.Both the the convergence studies and the result of dynamic crack propagation were presented.As well-known,crack propagation,aggregation,and bifurcation play an critical role in the failure analysis of brittle materials such as shale.The dynamic crack propagation and branching analysis of shale by using the PD method were discussed.Firstly,the valid and accuracy of the PD model for the rock materials was verified by comparing with the existed numerical results.Secondly,we discussed the convergence both with uniform grid refinement(m-convergence)and decreasing the peridynamics horizon(δ-convergence).Then the shale material with two pre-crack under uniaxial compression using the present PD model were discussed,and the influence of the different angle of flaws on the behavior of crack propagation was also analyzed.The results shows that both the loading conditions and the angle of flaws can influences the crack propagation in shale.