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

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.