拉胀三明治梁在爆炸载荷作用下的动态力学性能研究

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摘要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。

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关键词 ：拉胀, 负泊松比, 三明治梁, 有限元仿真

Abstract：The numerical method is employed to analysis the dynamic mechanical response and the properties of energy absorption of sandwich beams composed of auxetic cellular cores under blast loading. Pressure versus time histories representative of shock loadings are applied uniformly to the front facet of the sandwich beam; an impulse applied uniformly to the facet of sandwich beam is shown to model adequately blast loadings. Parametric analyses are performed to evaluate the performances of different designs and compared with equivalent monolithic beam of areal masses in terms of deformation and dissipated plastic energy. Various design parameters are considered, including the cell thickness, thickness of front panel and the expanding angle. In blast events, sandwich beams are found to reduce the back facet’s maximum displacement, delay the time of back facet’s reaches the maximum velocity and absorb more energy via plastic deformation of the auxetic cores when compared with monolithic beams.

Key words： auxetic Negative Poisson’s ratio sandwich beam finite-element simulation

收稿日期: 2016-02-23 出版日期: 2017-06-28

引用本文:

崔世堂1,2 咸玉席2 倪小军2,3. 拉胀三明治梁在爆炸载荷作用下的动态力学性能研究[J]. 振动与冲击, 2017, 36(13): 172-177.
Shitang Cui1,2 Yuxi Xian2, Xiaojun Ni2,3. Dynamic mechanical analysis of auxetic sandwich beams under blast loadings. JOURNAL OF VIBRATION AND SHOCK, 2017, 36(13): 172-177.

链接本文:

http://jvs.sjtu.edu.cn/CN/ 或 http://jvs.sjtu.edu.cn/CN/Y2017/V36/I13/172

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