泡沫铝柱壳对药柱水下爆炸压力场影响的数值研究

Effects of Al Foam on Pressure Fields of Underwater Explosion

基于流体弹塑性模型,建立了描述泡沫铝在爆炸载荷下的冲击响应方程;采用Lagrange差分格式,在均匀网格上对方程进行了离散;编写数值计算程序,进行了药柱水下爆炸的一维数值计算,重点考虑了泡沫铝对水中爆炸冲击波分布的影响。结果表明,数值计算结果与实验数据、LS-DYNA模拟结果基本吻合,证明所建立的泡沫铝流体弹塑性本构方程可以用来描述泡沫铝的冲击响应行为,且泡沫铝对水中爆炸冲击波压力场的影响显著。

Within the framework of hydrodynamic-elastoplastic model, equations were established to character ize the response behaviors of aluminum foam under explosive impact. In order to solve the equations,the equations were transformed into discrete Lagrange difference forms in uniform grid. The numerical calculation method was programmed and applied to one-dimensional numerical calculation of underwater explosion and shock response of A1 foam in the water. A good agreement is achieved between the numerical calculation, ex- periment data and results simulated by LS-DYNA-3D, which varified the feasibility of the proposed methodol- ogies to be applied to describe the behaviors of A1 foam under explosive impact. The thickness of foam materi- al shell has great impact on the pressure field of underwater explosion.