Study on the optimal thickness ratio of steel-aramid composite structure against local explosion

Previous studies of the steel-aramid anti-explosion structure have not dealt with the optimal thickness ratio of the steel and the aramid layers. In this paper, the damage mechanism of aramid-steel composite (ASCTs) target plate with single layer and multiple structural configurations under local explosion load is studied by experimental and numerical simulation methods. The influence of different thickness combinations on the anti-explosion performance of aramid composite structure was compared, and the thickness combination mode with the best cost performance was analyzed. The optimal structure anti-explosion design scheme was obtained by using the optimization method. The optimal thickness ratio has been analyzed, and the optimal anti-explosion structure design has been given. Experimental results show that at the same proportional blast distance (200 g TNT), the Q235 steel-aramid laminate target suffered no structural failure and its centre deflection was 10 % less than single-layer steel (S-1). The same thickness steel sheet (S-2) without the aramid laminate failed to perform as expected. The numerical simulation results show that at a proportional blast distance of 0.16 m/kg1/3, the best blast protection thickness ratio of the Q235 steel-aramid protective structure is 2.6:9.