步枪实弹发射枪榴弹后坐过载环境仿真方法

摘要

In order to provide ballistic environment to fuze design,the process of firing rifle grenade using 5.8 mm and 7.62 mm caliber bullet was simulated with the software ANSYS/LS-DYNA,and then the setback over-load-time curve was obtained,the peak of the setback overload was obtained through experiments using the cop-per cylinder pressure measuring principle,which proved the result of simulation.The peak of the setback over-load of firing rifle grenade using bullet was more than 1 9 000 g,and it’s much higher than that of firing rifle grenade using blank.The time that firing rifle grenade using bullet is as short as 120 μs,and closed to the time of impact when fuze was dropping to steel plate from 1.5 m height.The setback overload of firing rifle grenade using 7.62 mm calber bullet is 80% higher than that of firing rifle grenade using 5.8 mm caliber bullet.The set-back overload was lower when the material of the bullet trap was softer,whereas which was higher.%针对步枪实弹发射枪榴弹的后坐过载环境特殊，并不是膛压函数的问题，应用 ANSYS/LS-DYNA 有限元仿真软件对5.8 mm 和7.62 mm 口径步枪实弹发射枪榴弹过程进行数值模拟，获得了后坐过载-时间曲线，利用铜柱测压原理实验测得了后坐过载峰值，验证了仿真结果。步枪实弹发射枪榴弹的后坐过载峰值最小达19000 g ，远大于步枪空包弹发射时的后坐过载。步枪实弹发射枪榴弹的后坐过载持续时间很短，只有120μs 左右，与1.5 m 落高跌向钢板的跌落冲击持续时间接近。7.62 mm 口径枪弹发射枪榴弹的后坐过载比5.8 mm 口径枪弹发射枪榴弹的后坐过载大80%左右；捕弹器材料软时后坐过载小，反之则较大。