摘要
基于夹层结构是非常理想的抗爆炸冲击、弹道侵彻的轻质结构材料,制备了双层K-cor夹层结构试样。首先,采用一级轻气炮系统实验研究了双层K-cor夹层结构的高速冲击响应;其次,建立了双层K-cor夹层结构的有限元模型模拟了高速冲击过程,并利用该模型分析了高速冲击过程中的能量吸收和破坏模式;最后,讨论了结构的变化对于高速冲击性能的影响。结果表明:双层K-cor夹层结构相比单层结构的弹道极限速度提升了8.3%,模拟结果与实验值吻合较好;双层结构的优势在于更多界面在冲击作用下导致的吸能机制增加;提高Z-pin植入密度能够切实有效地提升K-cor的高速冲击性能。
Sandwich structure is an ideal lightweight structural material to resist explosion impact and ballistic penetration. First, the high-velocity impact response of double-layer K-cor sandwich structure is studied based on the first-stage light gas gun experiment. Then, the high-speed impact is simulated with the finite element model of double-layer K-cor sandwich structure. Besides, the energy absorption and failure modes during the impact are analyzed. Finally, the impact of changing structure on the high-velocity impact performance is discussed. The results show that the double-layer K-cor sandwich structure increases the ballistic limit speed by 8.3% compared to the sIngle-layer structure. The simulation results is agrees with the experimental values. The double-layer structure provides more interfaces for the system to increase energy absorption mechanism during the impact process. The increase of Z-pin implant density significantlyenhances the high-velocity impact performance of the K-cor structure.
作者
张楚凡
李勇
还大军
李丽沙
ZHANG Chufan;LI Yong;HUAN Dajun;LI Lisha(College of Material Science and Technology,Nanjing University of Aeronautics and Astronautics Nanjing,210016,China)
出处
《振动．测试与诊断》
EI
CSCD
北大核心
2020年第2期332-340,420,421,共11页
Journal of Vibration,Measurement & Diagnosis
基金
装备预研共用技术资助项目(41422020110)。
关键词
K-cor夹层结构
双层结构
高速冲击
吸能机制
数值模拟
K-cor sandwich structure
double-layer structure
high-velocity impact
energy absorption mechanism
numerical simulation
