Abstract A new damage-plasticity constitutive model which takes account of the effect of confining pressure and strain rate on the strength and post-peak behaviour is proposed for rock subjected to dynamic loading. The model treats the compressive and tensile damages, both related to plastic and volumetric deformations, separately. The strain rate effect is considered by incorporating a newly developed dynamic increase factor formula, which reflects the pure rate sensitivity of rock, into the yield surface via radial enhancement approach. Fractionally-associated flow rule and lode-angle dependency are employed to capture the shear dilation behaviour of rock. The new model is then implemented into LS-DYNA via a user defined material subroutine to simulate the mechanical response of rock under various loading scenarios including triaxial compression, direct tension, Split Hopkinson Pressure Bar compression, oval-nose projectile penetration and explosive blast action, reported in literature. The robustness and accuracy of the new model are demonstrated by validating against available experimental results and by benchmarking with the reported simulations.

中文翻译：

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一种速度和压力相关的岩石损伤塑性本构模型

摘要 提出了一种新的损伤塑性本构模型，考虑了围压和应变率对岩石的强度和峰后行为的影响。该模型分别处理与塑性变形和体积变形相关的压缩和拉伸损伤。通过径向增强方法将反映岩石纯速率敏感性的新开发的动态增加因子公式纳入屈服面来考虑应变率效应。分数相关流动规则和脉角相关性被用来捕捉岩石的剪切膨胀行为。然后通过用户定义的材料子程序将新模型实施到 LS-DYNA 中，以模拟岩石在各种载荷情况下的机械响应，包括三轴压缩、直接拉伸、分裂霍普金森压力棒压缩、椭圆鼻弹丸穿透和爆炸性爆炸作用，在文献中报道。新模型的稳健性和准确性通过对可用实验结果的验证以及与报告的模拟进行基准测试来证明。