摘要
为了探究异形装药结构药柱压制效果以及压制安全性的影响因素,采用Marc有限元软件的连续介质动力学方法对装药直径D=88 mm、成型高度H=132 mm、锥角α=60°的异形JH-2药柱压制成型过程进行了数值模拟分析,系统研究了压制压力、压制速率、初始相对密度、摩擦系数以及保压时间等工艺参数对药柱成型密度及内部应力的影响。结果表明:成型异形装药内部密度和应力分布不均匀,存在明显的密度松散区和应力集中区域;压制压力、初始相对密度、保压时间和摩擦系数同时影响药柱的成型密度和应力分布,压制压力、初始相对密度和压制速率以及装药结构则是影响异形药柱应力集中的主要因素;针对此异形装药结构,当压制压力取300~350 MPa、压制速率为1.5 mm·s^(-1)、初始相对密度为0.65、摩擦系数为0.15、保压时间选择120 s时,异形药柱的密度分布相对均匀,应力梯度差小,能提高成型质量,减小应力集中并避免裂纹产生,保证装药安全。
In order to investigate the influencing factors of the pressing effect and safety of the irregular-shaped charges,numerical simulation of the pressing process of the irregular-shaped JH-2 charge,with a diameter of D=88 mm,a molding height of H=132 mm,and a wedge angle ofα=60°,was carried out by using the dynamics of continuous media method in the Marc finite element software,and the effects of process parameters such as pressing pressure,pressing rate,initial relative density,friction coefficient,and holding time on the forming of the charges,including the molding density and internal stress,were studied sys-tematically.The results show that the density and stress distributions inside the irregular-shaped charge are nonuniform,and there are obvious regions of density loose and stress concentration.The pressing pressure,initial relative density,holding time and friction coefficient affect the molding density and stress distribution of charges simultaneously,while the pressing pressure,initial relative density and pressing rate are the main factors affecting the stress concentration of the irregular-shaped charge.In view of this irregular-shaped structure,when the pressing pressure is 300-350 MPa,pressing rate is 1.5 mm·s^(-1),initial relative density is 0.65,friction coefficient is 0.15,and holding time is 120 s,the density distribution of the irregular-shaped charge is relatively uniform,and the stress gradient difference is small,which can improve the molding quality,reduce the stress concen-tration and avoid cracks,and ensure the charging safety.
作者
罗春旺
苟瑞君
于晓东
张树海
张鹏
裴水旺
LUO Chun-wang;GOU Rui-jun;YU Xiao-dong;ZHANG Shu-hai;ZHANG Peng;PEI Shui-wang(School of Environment and Safety Engineering,North University of China,Taiyuan 030051,China;Shanxi Jiangyang Chemical Co.,Ltd.,Taiyuan 030041,China)
出处
《含能材料》
北大核心
2025年第6期635-644,共10页
Chinese Journal of Energetic Materials
关键词
异形装药
粉末压制
装药工艺
数值模拟
装药安全性
irregular-shaped charge
powder compacting
charging process
numerical simulation
charging safety
