基于SPH-FEM方法的水下近场爆炸数值模拟研究

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振动与冲击 ›› 2016, Vol. 35 ›› Issue (2) : 129-135.

论文

姜忠涛1，王雷2，孙鹏楠1，黄潇1

作者信息 +

Numerical investigation of near-field underwater explosion using SPH-FEM method

JIANG Zhongtao1，WANG Lei2，SUN Peng-nan1，HUANG Xiao1

Author information +

文章历史 +

摘要

针对结构水下近场爆炸载荷作用响应求解难点，通过改进的三维轴对称光滑粒子流体动力学方法(Smoothed Particle Hydrodynamics, SPH)计算获得近场爆炸载荷后传输给非线性有限元软件ABAQUS，利用声固耦合模型对结构响应进行时域非线性计算，形成预报水下近场爆炸载荷对结构毁伤的SPH-FEM模型，实现从药包起爆、结构大幅变形、局部撕裂直至完全剪切破坏的全过程模拟，对载荷时历曲线进行试验验证。计算背空矩形钢板在近场爆炸载荷的响应表明，数值结果与试验值吻合良好。SPH-FEM模型计算效率高、可操作性强，易推广至大型复杂结构受水下近场爆炸毁伤的分析与评估。

Abstract

The response of structures subjected to underwater shock wave is a high nonlinear problem, the main difficulties of which are the determination of the magnitude of shock wave load and the response of structures under thetransient load. Based on an improved axisymmetric Smoothed Particle Hydrodynamics (abbreviated as SPH) method, the near-field load of the underwater explosion is calculated and then it is transmitted to the FEM solving package ABAQUS. Based on the coupled acoustic-structure model in ABAQUS, the nonlinear response of the structure is obtained. The solving process described above is named as SPH-FEM model, based on which, one can simulate the near-field underwater explosion starting from the detonation of the explosive charge to the large deformation,local tearing and complete damaging of the structure. The theoretical aspects of axisymmetric SPH method are presented in detail in the first part, and then in the numerical results, the shock wave pressure load is validated by the experimental data. After that, the responses of rectangular plates subjected to near-field explosion are numerically investigated. The numerical results agree well with the experimental observations. Finally, some useful conclusions regarding near-field explosion are drawn. The SPH-FEM model introduced here is robust and efficient, which is suitable for engineering applications.

导出引用

姜忠涛1，王雷2，孙鹏楠1，黄潇1. 基于SPH-FEM方法的水下近场爆炸数值模拟研究[J]. 振动与冲击, 2016, 35(2): 129-135

JIANG Zhongtao1，WANG Lei2，SUN Peng-nan1，HUANG Xiao1. Numerical investigation of near-field underwater explosion using SPH-FEM method[J]. Journal of Vibration and Shock, 2016, 35(2): 129-135

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