Abstract:  In order to improve the explosion impact resistance of explosion-proof doors in large environmental experimental cabins， a new type of dual functional gradient core layer was designed based on a variable gradient negative Poissons ratio honeycomb core layer and the introduction of a tensile expansion concave hexagonal honeycomb structure. ABAQUS software was used to comprehensively analyze the impacts of different gradient core layers on the collapse mode and energy absorption characteristics of explosion-proof doors under impact loads， with a focus on exploring the changes in deflection and core layer compression of the front and rear panels under different explosion loads. The research results indicate that by properly configuring the directional gradient and concentric gradient， the specific energy absorption may be improved， and the core layer may achieve a more ideal deformation mode.  After optimization， the deflection of the front panel of the explosion-proof door was reduced by 23% to 26.7%， and the energy absorption capacity was increased by 64.6% to 83.6% compared to a single gradient core layer. 

Key words: explosion shock,  , functional gradient,  , energy absorption,  , honeycomb sandwich construction,  , negative Poisson's ratio

摘要： 为提高大型环境实验舱防爆门的抗爆炸冲击性能，基于变梯度负泊松比蜂窝芯层，通过引入拉胀内凹六边形蜂窝结构，设计了一种新型双功能梯度芯层。运用ABAQUS软件综合分析了不同梯度芯层对冲击载荷下防爆门的压溃模式和能量吸收特性的影响，着重探讨了不同爆炸载荷下前后面板挠度和芯层压缩量的变化。研究结果表明，通过合理配置方向梯度和同心梯度，可以提高比吸能并使芯层达到更为理想的变形模式；优化后的防爆门前面板挠度降低了23%～26.7%，吸能能力比单一梯度芯层提高了64.6%～83.6%。

关键词: 爆炸冲击, 功能梯度, 能量吸收, 蜂窝夹层结构, 负泊松比