T800平纹编织CFRP层合板高速冲击动态行为与防护性能

Dynamic Behavior and Protective Performance of T800 Plain-Woven CFRP Laminates Under High-Velocity Impact

  • 摘要: 碳纤维增强聚合物基复合材料(Carbon Fiber Reinforced Polymer,CFRP)因其优异的力学性能在抗冲击领域备受关注。为探究CFRP层合板结构抗高速冲击性能,针对T800级平纹编织的CFRP层合板开展了动态面内/面外压缩力学性能实验,分析了CFRP材料在高速冲击下的动态力学行为特性,进一步针对4 mm厚CFRP层合板开展了一级空气炮高速冲击试验和数值模拟,分析了CFRP层合板结构在不同速度和不同弹头冲击下的动态失效行为和多尺度损伤机制。结果表明:CFRP在面内面外高速冲击下均体现出明显的应变率强化效应,面外压缩体现出更强的抗冲击能力。高速冲击下CFRP层合板以宏观层间开裂、背面花瓣状破坏以及细观尺度纤维束拉伸-剪切耦合损伤、基体破碎等多种损伤机制吸收能量,能量吸收随着子弹冲击速度增大总体呈现先增后减趋势;对于平头弹,层合板破坏以纤维束拉伸-剪切耦合失效为主,弹道极限为151.57 m/s,最大能量吸收53.28 J;对于尖头弹,破坏则以环形剪切失效为主,弹道极限为140.94 m/s,最大能量吸收47.99 J,平头弹防护效果优于尖头弹。

     

    Abstract: Carbon fiber reinforced polymer (CFRP) composites have attracted considerable attention in the impact resistance field due to their excellent mechanical properties. To investigate the high-speed impact resistance of CFRP laminates, dynamic in-plane and out-of-plane compression tests were conducted on T800-grade plain-weave CFRP laminates. The dynamic mechanical behavior of CFRP materials under high-speed impact was analyzed. Furthermore, high-speed impact tests and numerical simulations were conducted on 4 mm thick CFRP laminates using a single-stage air cannon. The dynamic failure behavior and multi-scale damage mechanisms of the CFRP laminates were analyzed under different velocities and projectile impacts. The results show that CFRP exhibits significant strain rate strengthening under both in-plane and out-of-plane high-speed impact, with out-of-plane compression exhibiting greater impact resistance. Under high-velocity impact, CFRP laminates absorb energy through multiple damage mechanisms, including macroscopic interlaminar cracking, petalling failure on the rear surface, as well as meso-scale fiber bundle tensile-shear coupling damage and matrix crushing. The energy absorption generally increases first and then decreases with the increase of bullet impact velocity. For flat-nosed bullets, the failure of the laminate is mainly caused by fiber bundle tensile-shear coupling failure, with a ballistic limit of 151.57 m/s and a maximum energy absorption of 53.28 J. For spitzer bullets, the failure is mainly caused by annular shear failure, with a ballistic limit of 140.94 m/s and a maximum energy absorption of 47.99 J. The protection effect of flat-nosed bullets is better than that of spitzer bullets.

     

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