模拟发射加速度载荷条件下管状推进剂装药的应变率研究

摘要

The finite element model was established by LS-DYNA software, the strain and strain rate of tubular propellant charge under the condition of launching acceleration were simulated and calculated.The structure response of charge under the condition of 10000g (g is the acceleration of gravity)was analyzed.The effect of different acceleration load (5000-15000g)and structure size of charge on the maximum equivalent strain and strain rate was discussed.The results show that in the supporting acceleration load process for charge, the maximum equivalent strain and strain rate occur near the bottom of the inner hole.With increasing the axial acceleration from 5000g to 15000g , the change trend of equivalent strain-time curve and strain rate-time curve is basicallly the same.The maximum strain rate increases linearly from 13 s-1 to 35s-1 ,which is in medium strain rate range.With increasing the charge length from 120mm to 200mm, the maximum equivalent strain and maximum strain rate increase by 1.83% and 2.63%, respectively.%采用LS-DYNA软件建立了有限元模型,计算了模拟发射加速度条件下管状推进剂装药的应变及应变率;分析了10000g(g为重力加速度)条件下装药的结构响应,讨论了不同加速度载荷(5000~15000g)、装药结构尺寸对最大等效应变和应变率的影响.结果表明,在装药承受加速度载荷过程中,最大等效应力和应变均发生在底部内孔附近;随着轴向加速度由5000g增加到15000g,等效应变-时间曲线和应变率-时间曲线变化趋势基本相同,最大应变率由13s-1线性增至35s-1,处于中等应变率范围;装药长度由120mm增至200mm时,最大等效应变和应变率分别增加了1.83%和2.63%.