摘要
采用有限元LS-DYNA软件对30 mm小口径炮弹发射过程进行数值模拟,分析了不同时刻弹丸等效应变的分布规律,分别计算了炸药装药应力波作用阶段和装药整体过载作用阶段炸药装药的等效应变、应变率,讨论了不同弹底厚度对炸药装药最大等效应变及应变率的影响。弹底厚度为3.5 mm、2.5 mm和2 mm时,炸药装药等效应变、应变率随时间变化趋势一致;当弹底厚度由3.5 mm减小至2 mm,装药最大等效应变由4.42%增加到6.23%,最大等效应变率由167.64 s^(-1)增加到277.91 s^(-1);且弹底厚度越薄(特别是弹底厚度减小到2 mm时),炸药装药加载应力越大,炸药装药的等效应变、应变率越大。本文采用非均质炸药起爆判据,当弹底厚度为3.5 mm、2.5 mm时,炸药装药发射安全,当弹底厚度减小至2 mm时,炸药装药发射不安全。
The finite element LS-DYNA software was used to simulate the launch process of 30 mm smallcaliber shell.The distribution of the effective strain were analyzed at different moments.The equivalent strain,strain rate of the explosive charge are calculated respectively in the stage of the stress wave and the charge whole overload.The effect of different thickness on the maximum equivalent strain and strain rate of explosive charge were discussed.When the bottom thickness is 3.5 mm,2.5 mm and 2 mm,the equivalent strain,strain rate of the explosive charge is consistent with the time trend.With the bottom thickness from 3.5 mm to 2 mm,the maximum equivalent strain of the charge increased from 4.42% to 6.23% and the maximum equivalent strain rate increased from 167.64 s^（-1） to 277.91 s^（-1）.When the thickness of the bottom is thin（especially when the thickness of the bottom is reduced to 2 mm）,the greater the loading stress rate of the explosive charge,the greater the equivalent strain,strain rate of the explosive charge.In this paper,heterogeneous explosives initiation criteria is used.It is obtained that when the bottom thickness is 3.5 mm,2.5 mm,the explosive charge is safe.When the bottom thickness is reduced to 2 mm,the explosive charge is unsafe.
出处
《兵器装备工程学报》
CAS
2017年第10期9-14,20,共7页
Journal of Ordnance Equipment Engineering
关键词
小口径炮弹
炸药装药
数值模拟
过载分析
等效应变
等效应变率
弹底厚度
发射安全性
small-caliber shell
explosive charge
numerical simulation
over-loading analysis
effectivestrain
effective strain rate
bottom thickness
launch safety
作者简介
王小峰（1993-），男，硕士研究生，主要从事炸药装药发射过载安全性研究。;通讯作者：陶钢（1962-），男，博士，研究员，主要从事弹药设计及终点弹道毁伤研究，E-mail：taogang@njust．edu．cn。
