The Numerical Study on the Blast Resistance Performance of Protection Armor with I-Core Sandwich

For the promotion of the protective performance of the protection armor under the impact of ammunition, this study conducts a blast resistance performance analysis of the protection armor with an I-core sandwich. According to the numerical study, it can be found that the protective structure with an I-core sandwich can resist the blast effectively; meanwhile, aiming at the different components of such structure, the front and back plates can be simplified as multi-span and single-span statically indeterminate structure, respectively, the force between them is transferred based on the rib. Then, the parameters studies are conducted, and the results indicate that the blast resistance performance of the structure is beneficial from increasing thicknesses of the front plate and rib, narrowed gap between the rib and the rib placement direction of the shorter side. Furthermore, the research also found that the stress and damage distribution in the rib shows an obvious difference. In this regard, we conduct the optimal design on the protective structure under the most adverse case to fully use its blast resistance performance, namely, to place the steel bars between each rib. It is found that the horizontal placement of the steel bars can improve the overall mechanical performance of rib, strengthen the stiffness, and contribute to the blast resistance ability.