波纹夹芯梁在爆炸冲击复合加载下的动态力学行为数值模拟

A newly developed composite projectile designed to simulate cased explosive's combined loading and numerical method were implemented to study dynamic behavior of Weldox 460 E steel corrugated core sandwich beam subjected to combined blast and impact loading. Finite element modeling setting was validated based on published experimental and numerical results. By comparing the ballistic limit difference between the composite projectile and the flat-headed fragment simulation projectile (FSP), it is found that the ballistic limit of the corrugated sandwich beam is higher when subjected to the composite projectile than that under the single fragment simulation projectile condition. The main causes of the difference of ballistic limits are also explored. A parametric study was conducted and the influence of loading time interval on the target's ballistic limit, the mid-span displacement of the back face sheet and the energy absorbed from FSP was explored, which provides a reference for the design of corrugated sandwich beam as protective structure under combined blast and impact loading.