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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 theoretical calculation model of static plastic collapse stress of honeycomb structure, a theoretical calculation model of dynamic plastic collapse stress of honeycomb structure under impact load was established. Considering the effect of strain rate on dynamic mechanical properties of honeycomb structure, Cowper-Symonds model The relationship between static plastic collapse stress and dynamic plastic collapse stress is established. Based on the thin plate bending theory, the calculation formula of strain rate is derived from the average impact velocity, then the dynamic plastic collapse stress is obtained as a function of impact velocity and static plastic collapse stress The LS-DYNA dynamics software was used to simulate the deformation of the aluminum alloy honeycomb under the impact load, and the numerical results were in good agreement with the theoretical ones.