内部短药柱爆炸作用下钢筒破裂特征的数值分析

采用光滑粒子(SPH)法研究了短药柱在钢筒内爆炸形成破片的特征,采用Grady层裂准则描述钢筒的层裂破坏,破坏模式为随机破坏,服从Mott分布。分析了破片的质量分布和速度,计算结果表明:钢筒经过一定膨胀后,首先在装药端部位置破裂,然后爆心附近的钢筒解体成破片,如果是封闭钢筒,钢筒端部也是形成破片的重要部位。爆心附近的破片质量小、速度高;端部的破片质量较大、速度低;爆心附近的破片相对集中。

Numerical Analysis on Fragmentation Properties of the Steel Cylinder Subjected to Detonation of Internal Short Cylinderical Explosive Charge

The characteristics of fragments, which are numerical studied with Smoothed Particle Hydrodynamic (SPH) algorithms, come from the steel cylinder subjected to the detonation of internal short cylinderical explosive charge. Grady spall model is employed to describe the spall failure of the steel cylinder. Stochastic failure is used to define the failure models, in which Mott distribution is used to depict the failure strain. Mass distribution and velocity of fragments are mainly discussed. The results show that the part near the head of explosive begins to fracture after the steel cylinder expands to a certain extent, and then the part around the explosive disaggregates to fragments. For the closed cylinder, the ends are the other weakness position. The fragments around the explosion centre are smaller with high velocity, while the fragments around cylinder ends are larger with low velocity. The fragments near the explosion centre are relatively concentrated in the space.