爆炸波在硬-软-硬三明治介质中传播特性的数值分析

用非线性软件LS-DYNA对一维应变下不同组合多层介质中爆炸波传播进行了数值模拟,得出含泡沫材料软夹层的三明治介质的应力峰值较不含软夹层模型的应力峰值低约一个数量级,波的脉宽增加,传播波形发生明显的改变,幅值的衰减增加;求解获得了波在不同波阻抗层界面处的反射和透射曲线、硬软界面处的层裂破坏区域,以及不同层的吸能密度与比冲量随时间的演化特性.计算结果表明多层介质采用不同的组合方式和软夹层材料,改变了不同介质层中的载荷谱、动量和能量的分布.

Numerical Analysis of Propagation Characteristics of Explosive Wave in the Hard-soft-hard Sandwich Media

With nonlinear software LS-DYNA, propagation of one-dimensional strain explosive wave in the multi-layered media was analyzed by numerical simulation. The stress peak in hard-soft-hard sandwich media with a foam material as the middle layer is about one order of magnitude lower than that of other models without soft middle layer. The duration of stress wave increases and the peak value of the lower medium decreases significantly in the multi-layered media. The waveform of stress wave changes obviously. The reflection and the transmission curves of stress wave in interface of different layers with different wave impedance were obtained. The lamination crack zone in the interface of the hard-soft layer was acquired. Evolution characteristics of energy and impulse per unit area of different layers with time were analyzed. The calculation results show that different compound modes and softlayer materials used for multi-layered media can change the load spectrum, the distribution of energy and the momentum of different layers.