连续玻璃纤维和玻璃微珠共增强尼龙6复合材料的抗冲击性能

低速冲击是聚合物基复合材料在运输和服役过程中常见损伤方式，常造成复合材料结构损伤、性能降低、承载能力下降，影响使用。针对2D纤维增强聚合物基复合材料在冲击载荷作用下抗分层能力差的问题，本文采用熔融挤出结合热压成型法制备了二元和三元尼龙6(PA6)基复合材料，对比研究了连续玻璃纤维(GF)、玻璃微珠(GB)及两者共增强PA6基复合材料的摆锤冲击性能和落锤低速冲击响应。结果表明：(1) GF和GB能显著提高PA6的抗冲击性能，且GF的增强效果明显高于GB;(2) GB增强PA6基复合材料(GB/PA6)的冲击强度随GB加入量增大而先增大后降低，加入量为25wt%时冲击强度最大；冲击载荷作用下，25wt%GB/PA6的耗能机制除了界面脱粘和钉扎效应之外，还发现GB在PA6基体中的滑移耗能新机制；(3) GF和GB共增强PA6复合材料(GB-GF/PA6)中纤维起主要的增强作用，摆锤冲击实验和落锤冲击实验均证明存在协同增强效应；(4) GF和GB共增强的协同增强效应是由于共增强复合材料在冲击载荷作用下，抗Ⅱ型裂纹扩展能力提高，使复合材料抗分层能力得到强化；从而证明在基体中引入适量球形GB是提高...

Impact resistance of continuous glass fiber and glass bead co-reinforced Nylon 6 composites

Low-velocity impact is a common damage mode for polymer matrix composites during transportation and service, often results in structural damage, performance degradation, and loss of load-bearing capacity, which affects the use of the composites. To address the problem of poor delamination resistance of 2D fiber-reinforced polymer matrix composites under impact loading, binary and ternary Nylon 6 (PA6)-based composites were prepared by melt extrusion combined with hot pressing, and the pendulum impact performance and drop hammer low-velocity impact response of continuous glass fiber (GF), glass beads (GB) and both co-reinforced PA6-based composites were comparatively investigated. The results show that: (1) GF and GB can significantly improve the impact resistance of PA6, and the enhancement effect of GF is significantly higher than that of GB; (2) Impact strength of GB-reinforced PA6-based composites (GB/PA6) showed a trend of increasing and then decreasing with increasing GB incorporation, with the maximum impact strength at 25wt% incorporation; the energy dissipation mechanism of 25wt%GB/PA6 under impact loading was found to be a new mechanism of slip energy dissipation of GB in PA6 matrix, in addition to interfacial debonding and pinning effects; (3) The fibers in GF and GB co-reinforced PA6 composites (GB-GF/PA6) play a major reinforcing role, and both pendulum impact tests and drop impact tests demonstrate a synergistic reinforcing effect; (4) The synergistic reinforcing effect of GF and GB co-reinforcement is due to the increased resistance to type II crack expansion of the co-reinforced composites under impact loading, resulting in the reinforcement of the composite against delamination. Thus, demonstrating that the introduction of an appropriate amount of spherical GB into the matrix is an economical and effective way to improve the resistance of 2D fiber-reinforced polymer matrix composites to low-velocity impact.