侵彻过程中装药摩擦点火数值模拟

Numerical Simulation on Frictional Ignition of Charge During Projectile Penetration

为研究弹体侵彻过程中装药安全性,采用分步数值模拟方法,在计算弹体侵彻靶体过程的基础上再计算弹体内部装药响应.装药响应计算中采用反加靶体阻力与热力化耦合算法并考虑了装药的摩擦温升机制,计算得到了装药点火的临界弹体初速,与实验结果吻合较好.计算结果表明,弹体内壁与装药之间的摩擦是引起装药温升的重要因素,装药发生摩擦点火的部位接近于装药中部.计算结果可为侵彻弹体的装药结构设计提供依据,计算方法为侵彻过程中装药的响应和安全性分析提供技术支撑.

To study the charge safety during projectile penetrating process, split-step numerical simulation method was applied. The projectile penetration process was calculated first and then the responses of charge in the projectile were calculated. The methods of loading resistance on the surface of projectile, the coupled thermo-mechanical-chemical algorithm, and temperature rise mechanism induced by friction were used to simulate the responses of charge. The obtained critical striking velocity of projectile was consistent with the reported experimental results. The results suggest that the friction between projectile and charge is the key factor in the temperature rise of charge, and the ignition location of charge is close to the middle of charge. This study provides the theoretical evidence for the structural design of charge. The presented methods of loading resistance and coupled thermo-meehanical-chemical algorithm of charge during the projectile penetration would provide technique support for simulating responses of charge and system safety.