蜂窝结构异面变形动态塑性坍塌力学  

Dynamic plastic collapse mechanical model of honeycomb structures out-plane deformation

作　　者：樊彦斌[1] 王之栎[1] 

机构地区：[1]北京航空航天大学机械工程及自动化学院,北京100191

出　　处：《北京航空航天大学学报》2012年第11期1464-1468,共5页Journal of Beijing University of Aeronautics and Astronautics

摘　　要：在蜂窝结构静态塑性坍塌应力理论计算模型的基础上,建立了蜂窝结构在冲击载荷作用下的动态塑性坍塌应力的理论计算模型.考虑应变率对蜂窝结构动态力学性能的影响,使用Cowper-Symonds模型建立了静态塑性坍塌应力与动态塑性坍塌应力之间的关系;基于薄板弯曲理论,由平均冲击速度得到了应变率的计算公式,进而得出动态塑性坍塌应力关于冲击速度与静态塑性坍塌应力的函数关系.使用LS-DYNA动力学软件模拟了铝合金蜂窝结构在冲击载荷作用下的异面变形,数值计算结果与理论模型计算结果一致.Based on the static plastic collapse stress(SPCS) theoretical model,a dynamic plastic collapse stress(DPCS) theoretical model of honeycomb structures under impact loading was built.In view of the effect that the strain rate had on the dynamic mechanical performance of honeycomb material,the relationship between SPCS and DPCS was established by using Cowper-Symonds model.A sheet bending theory based strain rate formula via the average impact speed was developed.Furthermore,a function about the relationship between DPCS and impact speed was proposed.At last,an out-plane deformation simulation of the aluminum honeycomb structures under impact loading was performed on LS-DYNA dynamics software.The numerical calculation results coincide with the theoretical model calculation ones.

关 键 词：蜂窝结构 异面变形 冲击载荷 塑性坍塌应力 

分 类 号：V414.6[航空宇航科学与技术—航空宇航推进理论与工程]