An optimization design method for the new type steel/aramid fiber laminated composite structure against fragment penetration was studied in this paper.The ballistic limit velocity experiment results of 7.5 g FSP fragment impacting 4 mm steel + 12 mm aramid fiber composite plate,and 5 mm steel + 10 mm aramid fiber composite plate were analyzed.The numerical simulation of fragment impacting composite structure at same experimental condition was performed.Based on the validated numerical simulation model,the numerical simulation of 7.5 g and 10.0 g fragments impacting 4 mm and 5 mm laminated with 6-16 mm thickness aramid fiber composite plates was performed.The corresponding ballistic limit velocities was obtained.The penetration mechanism was then analyzed based on the experiment data and numerical simulation results.According to the protection characteristics of this kind of composite structures,using minimum areal density as target function,a structure parameter optimization design model was created which was suitable for certain mass fragment impacting target at a certain velocity range.The proposed method was used to design the steel/aramid fiber composite against 10.0 g fragment impacting at 1 100 m/s.The composite structure was tested experimentally and the rationality and applicability were verified.%针对抗破片侵彻用新型钢/芳纶纤维叠层复合结构优化设计,基于4 mm钢板+12 mm芳纶纤维叠层复合结构、5 mm钢板+10 mm芳纶纤维叠层复合结构抗7.5 gFSP型破片弹道极限速度试验分析,进行了同工况下破片侵彻叠层复合结构的数值仿真计算;在验证数值仿真模型基础上,开展了7.5g与10.0 g破片对4 mm、5 mm钢板叠加6～ 16mm芳纶纤维板组合成复合结构侵彻数值仿真,获得了相应的弹道极限速度;根据试验现象和数值仿真结果进行了钢/芳纶纤维叠层复合结构抗破片侵彻机理分析;根据此类复合结构的防护特点,以结构最小面密度为目标函数,建立了适用一定破片质量和撞击速度范围的结构参数优化设计模型;采用所提方法进行了抗撞击速度为1 100 m/s的10.0g破片侵彻的钢/芳纶纤维复合结构实例设计,通过试验验证了优化设计方法的合理性和实用性.
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