Energy dissipation mechanism and ballistic characteristic optimization in foam sandwich panels against spherical projectile impact  

作　　者：Jianqiang Deng Tao Liu Liming Chen Xin Pan Jingzhe Wang Shaowei Zhu Weiguo Li 

机构地区：[1]College of Aerospace Engineering,Chongqing University,Chongqing 400030,China [2]State Key Laboratory of Coal Mine Disaster Dynamics and Control,Chongqing University,Chongqing 400030,China [3]Chongqing Key Laboratory of Heterogeneous Material Mechanics,Chongqing University,Chongqing 400030,China [4]State Key Laboratory of Explosion Science and Technology,Beijing Institute of Technology,Beijing 100081,China

出　　处：《Defence Technology（防务技术）》2024年第5期108-122,共15页Defence Technology

基　　金：the National Natural Science Foundation of China(Grant Nos.11972096,12372127 and 12202085);the Fundamental Research Funds for the Central Universities(Grant No.2022CDJQY004);Chongqing Natural Science Foundation(Grant No.cstc2021ycjh-bgzxm0117);China Postdoctoral Science Foundation(Grant No.2022M720562);Chongqing Postdoctoral Science Foundation(Grant No.2021XM3022);supported by the opening project of State Key Laboratory of Explosion Science and Technology(Beijing Institute of Technology);The opening project number is KFJJ23-18 M。

摘　　要：This study systematically examines the energy dissipation mechanisms and ballistic characteristics of foam sandwich panels(FSP)under high-velocity impact using the explicit non-linear finite element method.Based on the geometric topology of the FSP system,three FSP configurations with the same areal density are derived,namely multi-layer,gradient core and asymmetric face sheet,and three key structural parameters are identified:core thickness(t_(c)),face sheet thickness(t_(f))and overlap face/core number(n_(o)).The ballistic performance of the FSP system is comprehensively evaluated in terms of the ballistic limit velocity(BLV),deformation modes,energy dissipation mechanism,and specific penetration energy(SPE).The results show that the FSP system exhibits a significant configuration dependence,whose ballistic performance ranking is:asymmetric face sheet>gradient core>multi-layer.The mass distribution of the top and bottom face sheets plays a critical role in the ballistic resistance of the FSP system.Both BLV and SPE increase with tf,while the raising tcor noleads to an increase in BLV but a decrease in SPE.Further,a face-core synchronous enhancement mechanism is discovered by the energy dissipation analysis,based on which the ballistic optimization procedure is also conducted and a design chart is established.This study shed light on the anti-penetration mechanism of the FSP system and might provide a theoretical basis for its engineering application.

关 键 词：Sandwich panel Numerical simulation Ballistic resistance Specific penetration energy Energy analysis 

分 类 号：TB33[一般工业技术—材料科学与工程]