摘要
本文利用结构冲击实验平台,研究了薄壁圆筒结构低速大能量冲击下的屈曲吸能行为。实验结果表明:局部应变率对屈曲压溃力历程有较大影响;同时,材料应变强化效应导致了平均压溃力的实验值高于理论值。利用LS-DYNA软件对薄壁圆筒冲击吸能过程进行了数值模拟,采用Johnson-Cook方程、弹塑性(Cowper-Symonds方程)二种考虑应变率和应变强化的本构模型,比较了本构模型及边界条件对屈曲行为的影响可知,在合适的边界条件下,Johnson-Cook模型能更好地反映薄壁圆筒的冲击屈曲行为。
The buckling behavior of thin-walled tube under low speed impact of massive object is experimentally studied using an impact platform for structures. The experimental results show that local strain rate has obvious effect on transient crushing force. Strain hardening of the material makes the average crushing force of the tube being higher than the theoretical value. The effects of different constitutive models: Johnson-Cook and elastic-plastic( Cowper-Symonds) and boundary conditions on the buckling behavior of the tube are numerically studied using LS-DYNA. It demonstrates that Johnson-Cook model can give a better description of buckling behavior under the appropriate boundary condition.
出处
《兵工学报》
EI
CAS
CSCD
北大核心
2014年第S2期244-250,共7页
Acta Armamentarii
关键词
固体力学
薄壁圆筒
渐进屈曲
冲击吸能
本构关系
solid mechanics
thin-walled tube
progressive buckling
impact energy absorption
constitutive model
