爆炸膨胀环一维应力假定的分析与讨论  

Discussion about one-dimensional stress presume for explosion expanding ring test

作　　者：汤铁钢[1] 李庆忠[1] 陈永涛[1] 童慧峰[1] 刘仓理[1] 

机构地区：[1]中国工程物理研究院流体物理研究所冲击波物理与爆轰物理国防科技重点实验室,四川绵阳621900

出　　处：《爆炸与冲击》2010年第6期577-582,共6页Explosion and Shock Waves

基　　金：国家自然科学基金项目(10872187);冲击波物理与爆轰物理国防科技重点实验室基金项目(9140C6702010903)~~

摘　　要：对爆炸膨胀环的运动过程和应力状态进行了理论分析,指出膨胀环在径向变形过程中其厚度减小将引起内外壁的速度差,对膨胀环内外壁的速度差进行了分析。由于膨胀环内外壁速度差的存在必然造成复杂应力状态,无法满足一维应力假定,由此推断出实验中利用外壁速度计算出的应力要略大于膨胀环内的平均应力。利用LS-DYNA三维动力学有限元程序验证了理论分析结果,利用膨胀环外壁速度计算出的应力比数值模拟给出的膨胀环内平均应力大1%左右。A theory analysis of movement and stress state of explosion expanding ring has been carried out.The results show that one-dimensional stress presume may bring out the departure of velocity and stress of ring.The departure of velocity and stress has been estimated by theory analysis.The stress calculated by velocity of outer surface of ring is larger than the average stress on the section of ring.The numerical simulation has validated the results from theory analysis,and determined the range of stress departure carried by one-dimensional stress presume.

关 键 词：固体力学 一维应力 反向求解 膨胀环 

分 类 号：O347[理学—固体力学]