含铝炸药在混凝土介质中爆炸响应的FE-SPH算法模拟研究

FE-SPH method for simulating explosion response of aluminized explosives in concrete

采用自编程实现的二维轴对称FE-SPH耦合算法对含铝炸药在混凝土介质中的爆炸响应过程进行模拟研究。含铝炸药的爆炸过程采用JWL方程结合Miller反应率方程来描述,同时采用粒子接触算法避免爆炸响应后转化的SPH粒子点间形成堆积及非物理穿透。对不同含铝量的高能炸药在不同埋深下爆炸响应过程进行模拟,通过对混凝土的毁伤及预设动能杆的运动分析,结果表明,所实现的FE-SPH耦合算法能够稳定再现含铝炸药爆炸对混凝土介质的破坏响应过程,并且响应的特征参量也与实验数据吻合。

The code made by authors for the two-dimensional axisymmetric FE-SPH method was applied to simulate the explosion process of aluminized explosives in concrete. Explosion process of aluminized explosives was described with JWL state equation and Miller reaction rate equation. In order to avoid the accumulation and non-physical penetration of particles formed from FE elements after the explosion, the particle-particle contact method was adopted. The explosion processes of aluminized explosives with different aluminum content and different depths of concrete were simulated. Numerical results showed that the FE-SPH method can stably reproduce the explosion process of aluminized explosives in concrete; the characteristic parameters of explosion responses obtained with the FE-SPH method agree well with those of test data.