泰勒冲击载荷下的炸药动态响应过程数值计算

Numerical Simulation on Explosive Dynamic Response of Taylor Impact

为了研究Comp.B炸药在泰勒惯性冲击载荷下的力学响应特性,基于非线性有限元LS-Dyna软件与Johnson-Cook材料本构模型,建立了两种不同装药模型的有限元模型并进行了仿真,验证了模型的正确性与合理性。通过计算得到了装药模型在不同冲击载荷下的变形、应力曲线及应力的尺寸效应。药柱撞击面附近只在撞击初期(侧向稀疏波抵达中心前)出现高压,其余时间药柱处于弹塑性变形阶段;同一冲击速度下,药柱应力峰值随尺寸的增大而增大,且增幅逐渐变小。结果表明计算方法可行,所得结果对炸药装药结构设计、使用及运输过程中的安全性具有指导和预测作用。

In order to research the mechanical response characteristics of the Comp.B explosive in inertial impact,the LS-Dyna software and Johnson-Cook material constitutive model were adopted based on the non-linear finite element method.The finite element models of two different kinds of charge models were set up and simulated.And the correctness and rationality of the model wer verified according to the experiment data.The stress curve,deformation and size effect of stress were obtained under different impact loads.And it was discovered that,first,impact surface nearby the explosive only in the early impact （lateral sparse wave arrived before the center） appeared high pressure,and for most of the time it was in elastic-plastic deformation stage.Second,under the same impact velocity,the explosive peak stress increased along with the increase of explosive size,and the added value decreased gradually.The results show that,the method is practical and feasible,and the results of the method have a guidance and prediction effect for the explosive charge structure design.