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通过ANSYS/LS-DYNA有限元软件对大理岩动态劈裂拉伸实验过程进行数值模拟,分别利用传统圆柱形冲锤、异形冲锤和在输入杆撞击端加波形整形器后再用传统圆柱形冲锤冲击的方式进行模拟,分析了动载荷下大理岩的破坏机理。研究试样在不同应变率下的破坏应变,讨论了冲锤以不同的冲击速度冲击与入射杆的轴向最大应力、试样的破坏时刻和破坏应变的关系。研究结果表明:在动态冲击作用下,随着冲击速度的增大,大理岩材料应变率呈增大趋势,而破坏时间和破坏应变呈减小趋势。
The experimental data of dynamic split splitting of marble were simulated by ANSYS / LS-DYNA finite element software. The traditional cylindrical ram, special ram and the impact rod were added respectively. Ram impact mode to simulate the failure mechanism of marble under dynamic load. The failure strain of the specimen under different strain rates was studied. The relationship between the maximum impact stress of the impacting hammer and the rod’s axial maximum stress, the failure moment of the specimen and the failure strain was discussed. The results show that with the increase of impact velocity, the strain rate of marble increases with the increase of impact velocity, and the failure time and failure strain decrease with the increase of impact velocity.