修正的Mohr-Coulomb破坏准则在斜侵彻过程中的应用

以杆弹斜侵彻钢纤维混凝土靶的数值模拟为目标,将HJC模型嵌入了自主开发的动态有限元HVP3D程序中,提出了考虑拉伸破坏、应变率、压力和剪力影响的修正的Mohr-Coulomb破坏准则,模拟靶板的可能破坏情况,并和最大拉应力累积破坏准则的结果进行了比较,发现修正的Mohr-Coulomb破坏准则较好地反映靶板的破坏情况.同时将修正的Mohr-Coulomb破坏准则应用到带攻角的斜侵彻数值模拟中并与实验结果进行了对比.

Application of the modified Mohr-Coulomb failure criterion in oblique penetration simulation

The modified Mohr-Coulomb failure criterion and HJC model were incorporated into the three-dimensional dynamic explicit finite element code HVP3D for modeling penetration into steel fiber reinforced concrete. Tension failure,compressive damage softening,hydrostatic pressure and strain rate effects were considered in the modified M-C failure criterion. By using the proposed method,numerical simulation on yawed oblique penetration was carried out and compared with the experimental results. Calculation results show that modified M-C failure criterion is better than the tension stress failure criterion for simulating the failure of the concrete target.