拉胀三明治梁在爆炸载荷作用下的动态力学性能研究

摘要

The numerical method was employed to investigate the dynamic response and the ability of energy absorption of a sandwich beam with auxetic cellular cores under blast loading.Pressure time histories replacing blast loading were applied uniformly on the front facet of the sandwich beam.The back facet'' maximum displacement and energy-dissipating of the sandwich beam were compared with those of the corresponding monolithic one in the premise of the same surface load density.The facets and cores of the sandwich beam were designed parametrically with design parameters of cell thickness, thickness of front panel and expanding angle of cell elements.Under blast loading, it was shown that compared with the corresponding monolithic beam, the sandwich beam can reduce its back facet''s maximum displacement, delay the time of back facet''s reaching the maximum velocity and absorb more energy via plastic deformation of auxetic cores.%通过数值方法考察了芯层采用负泊松比蜂窝的三明治梁在爆炸载荷作用下的动态力学响应和能量吸收能力.采用在三明治梁面层施加均匀载荷的方式代替爆炸载荷,在相同面密度的前提下,就背板的最大位移和复合梁的能量耗散问题和实体梁进行了对比,并对复合梁的面板和芯层进行了参数化设计.设计参数包括胞壁厚度、前面板的厚度、胞元扩张角.在爆炸载荷作用下,和实体梁相比,复合梁可以降低背板最大位移,延迟背部面板到达最大速度时的时间,吸收更多的能量.