不同起爆方式下炸药驱动柱壳膨胀断裂的数值模拟

Numerical studies of explosion induced cylindrical shell fracture under different detonating modes

采用数值模拟方法,研究不同起爆方式下内部炸药对金属柱壳的加载历程差别。计算结果表明,不同起爆方式下柱壳内表所经受的压力载荷、做功历史显著不同,分析了引起差异的原因。提出一种半解耦数值方法,使柱壳网格划分得更细,可以模拟不同起爆方式下柱壳的膨胀破坏过程,通过理论分析说明了这种方法的合理性。

The explosion induced fracture of metallic cylinder under different detonating modes was simulated.The results show that different detonating modes lead to significant differences on the pressure and apply work history of the cylindrical shell.A semi-decoupling numerical method was proposed to thin the mesh size of the metallic cylinder and to simulate the process of destruction of cylindrical shell under different detonating modes with higher degree of accuracy.Theoretical analysis shows that this method is reasonable.The shear bands appearing during the fracture of metallic cylindrical shell was reproduced using this semi-decoupling method.