内爆炸准静态压力对球形容器弹塑性动态响应的影响  

Effects of Quasi-static Pressure on Dynamic Elastic-Plastic Response of Spherical Vessels under Internal Blast

作　　者：孙琦 董奇[1] 杨沙[1] 张刘成[1] SUN Qi;DONG Qi;YANG Sha;ZHANG Liu⁃cheng(Institute of Chemical Materials,CAEP,Mianyang 621999,China)

机构地区：[1]中国工程物理研究院化工材料研究所

出　　处：《含能材料》2020年第1期25-31,共7页Chinese Journal of Energetic Materials

基　　金：国家自然科学基金(11672272,11372293,11872343);四川省科研课题(17PJ097,2018GZ0536)

摘　　要：利用单自由度模型对球壳弹塑性动态响应过程进行力学分析并推导出解析解,得到等向强化双线性弹塑性球壳在考虑准静态压力的内爆炸载荷作用下径向位移响应公式,解析结果与数值模拟结果吻合较好。对屈服发生于首个脉冲阶段和准静态压力阶段的两种情况进行分析,获得了准静态压力对球壳弹塑性动态响应的影响规律。研究发现,若屈服发生于准静态压力阶段,进入屈服阶段时刻会受准静态压力幅值影响,随准静态压力的增大而减小;无论屈服发生于哪个阶段,最大位移均出现于准静态压力阶段,且出现时刻有明显差异,最大位移值随着准静态压力幅值的增大而显著增大;与弹性响应结果相比,在弹塑性响应分析中准静态压力幅值对最大位移的影响更为显著。研究表明,在炸药的威力评估工作中,针对准静态压力效应采取结构弹塑性响应分析更有实用价值和指导意义。Based on the single degree of freedom model,the dynamic elastic-plastic response of a spherical shell subjected to internal impulse with quasi-static pressure is obtained. Analytical solutions agree well with numerical simulation results. The solutions can be divided into two situations by confirming whether the yield point occurs in first triangle impulse or the duration of quasi-static pressure. Effects of quasi-static pressure can be studied in two different situations. If the yield occurs in the quasi-static pressure phase,the time when yield occurs is affected by the quasi-static pressure and decreases with the increase of the quasi-static pressure. Whenever the yield occurs,the maximum displacement occurs in the quasi-static phase,and the time reaching maximum displacement is quite different. The value of maximum displacement increases significantly with the increase of the quasi-static pressure. Compared with the elastic situation,the quasi-static pressure has a more obvious effect in the elastic-plastic response analysis. Therefore,the elastic-plastic dynamic response analysis is more valuable and instructive for the evaluation of quasi-static pressure.

关 键 词：有限空间内爆炸 爆炸容器 准静态压力 冲击载荷 弹塑性动态响应 

分 类 号：TJ02[兵器科学与技术—兵器发射理论与技术] O383[理学—流体力学]