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High speed impact penetrators need to penetrate into the soil to a certain depth to achieve a specific function. Due to the high penetration speed (about 150 m/s), the inertia force and acceleration response caused by the collision are very large. In order to ensure that the internal PCB circuit will not fail, the design of the energy absorber is indispensable. In this paper, the foamed aluminum filled thin-wall structure is used as an energy absorber. The analysis results show that the foam-filled thin-wall structure is an excellent energy absorber, which has better isolation efficiency and energy absorption capacity, and the foam-filled thin-wall structure with combined density has better energy absorption effect. Introduction In recent years, various types of metal foams have developed rapidly and have gradually become a new type of structural functional materials. These porous materials have many excellent mechanical properties such as high specific gravity, high impact energy absorption capacity, extremely light weight, and stable deformation. Therefore, foam materials are widely used in automotive, aerospace, military protection and other fields. S Hou et al. [1-3] studied the deformation of the foam-filled tube structure and constructed the response surface function of energy absorption and peak crushing force to find the best crashworthiness scheme for thin-walled structures. Isabel Duarte et al. [4] compared the energy absorption effects of foam, empty tubes and foam-filled empty tubes and the foam-filled hollow tube structure has more stable axial collision performance. The results also demonstrate that heat treated aluminum alloy structures ensure high ductility and very good crashworthiness since they deform without formation of cracks during compression, which is a pre-requisite for good and reliable crashworthiness behavior. Dirgantara T et al. [5] described the collisional mechanical behavior of foam-filled single-wall and double-walled columns. And the interaction between the foam core and the column wall will change the deformation mode from one localized fold to multiple propagating folds and lead to the increase of total mean crushing force of the column. Ebrahimi S et al. [6-7] studied the crashworthiness of functionally graded foam filled tubes and analyzed the effects of foam aluminum density versus energy absorption (EA) and peak impact force (PCF). Yanfei Xiang et al. [8]gave five key indicators for energy absorption in thin-walled structures based on axial compression experiments: Effective Stroke Ratio, Nondimensional Load_carrying Capacity, Specific Energy Absorption, Effectiveness of Energy absorption, Undulation of load_carrying capacity.

Application of Foam-Filled Thin-wall Structures in High Speed Impact Penetrator