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

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