爆炸载荷作用下具有可折叠芯层夹芯梁的动态响应

基于目前研究最广泛的刚性折纸(Tachi-origami)样式，通过改变其初始折叠角度构建出4种不同的蜂窝胞元，并且通过排列分布将其组成夹芯梁。采用商用有限元软件Abaqus/explicit对准静态和爆炸载荷作用下可折叠芯层夹芯梁的力学响应进行研究，分析可折叠芯层的泊松比变化规律、夹芯梁背板挠度以及能量吸收机理；并将夹芯梁与等质量的实体梁进行对比。采用后面板最大挠度作为抗爆性能的评价，结果发现:可折叠芯层在准静态载荷下具有一定的负泊松比效应；夹芯梁的抗爆性能优于实体梁，曲边蜂窝的初始折角对其作为芯层夹芯梁的抗爆性能有较大影响，随着初始折角的逐渐增大，其抗爆性能逐渐下降；当初始折角为直角时对应于方孔直边蜂窝，其抗爆性能最差。

Dynamic response of sandwich beam with foldable core under blast loading

In this study four different honeycomb cells were fabricated by changing the original folding angle based on the Tachi-origami pattern that is at present being studied widely,and sandwich beams were made from them by arranging them specifically.The quasi-static mechanical response of the foldable core and dynamic response of the sandwich beam with different foldable core shapes was investigated using the commercial package ABAQUS/explicit.The out-plane Poisson ratio's variation of the foldable core,the back-sheet deflection and the plastic dissipation energy of the sandwich beam were analyzed and compared with the monolithic beam.The anti-explosive performance of the sandwich beams was evaluated by the maximum deflection of the back-sheet.The results show that there is a negative Poisson ratio's performance of the foldable core under quasi-static loading.The blast resistance of the sandwich beam is better than that of the monolithic one.The effect of the original folding angle on the dynamic response is very obvious for the curved web honeycomb.The blast-resistant performance decreases gradually as the original folding angle increases.The blast resistance of the sandwich beam with a straight web honeycomb core is comparatively the worst among the four honeycomb cores.