In this study, a peridynamic material model for a polycrystalline ice is utilised to investigate its fracture behaviour under dynamic loading condition. First, the material model was validated by considering a single grain, double grains and polycrystalline structure under tension loading condition. Peridynamic results are compared against finite element analysis results without allowing failure. After validating the material model, dynamic analysis of a polycrystalline ice material with two pre-existing cracks under tension loading is performed by considering weak and strong grain boundaries with respect to grain interiors. Numerical results show that the effect of microstructure is significant for weak grain boundaries. On the other hand, for strong grain boundaries, the effect of microstructure is insignificant. The evaluated results have demonstrated that peridynamics can be a very good alternative numerical tool for fracture analysis of polycrystalline ice material.

中文翻译：

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多晶冰裂缝的近场动力学模拟

在这项研究中，利用多晶冰的近场动力学材料模型来研究其在动态载荷条件下的断裂行为。首先，通过考虑拉伸载荷条件下的单晶、双晶和多晶结构来验证材料模型。近场动力学结果与有限元分析结果进行比较，不允许出现故障。在验证材料模型后，通过考虑相对于晶粒内部的弱晶界和强晶界，在拉伸载荷下对具有两个预先存在的裂纹的多晶冰材料进行动态分析。数值结果表明，微观结构对弱晶界的影响是显着的。另一方面，对于强晶界，微观结构的影响是微不足道的。