Impact damage on ultrahigh molecular weight polyethylene weft knitted composites with different layers
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摘要: 研究了不同层数超高分子量聚乙烯(UHMWPE)纤维/环氧树脂纬平针织复合材料的冲击性能, 并讨论了其冲击损伤模式。复合材料板分别为4、 6、 8层纬平针织结构, 采用真空辅助树脂传递模塑(VARTM)工艺层合而成, 以不同的冲击能量(10~55 J)冲击复合材料板直至层合板被穿透, 得到冲击能量与吸收能量关系图以及接触力-挠度曲线。分析了不同冲击能量下, 复合材料中织物的损伤形式和破坏过程。研究结果表明: 在3种针织结构复合材料中, 8层纬平针织结构承受载荷的能力最强, 6层纬平针织结构次之, 4层纬平针织结构最差;随着冲击能量的增加, 3种试样的冲击挠度均增大;基体开裂、 纤维断裂是试样被渗透时有效的损伤模式, 基体和纤维断裂是试样被穿孔时有效的损伤模式。Abstract: The impact properties of ultra-high molecular weight polyethylene (UHMWPE) fiber/epoxy weft plain knitted composites by vacuum assisted resin transfer molding (VARTM) process were investigated by considering impact energy and absorbtion energy profile diagram and the related contact force–deflection curves. The composites consisting of 4, 6, 8 layers weft plain knitted structure were subjected to different impact energies (10-55 J). The damage modes and damage processes of fabrics under varied impact energies were also discussed. Results show that the maximum contact force is observed in 8 layers weft plain knitted structure, followed by 6 layers weft plain knitted structure, and the minimum contact force is observed in 4 layers weft plain knitted structure; the impact deflection of three knitted composites is increased by increasing the impact energy; the effective damage modes for penetration are matrix cracking and fiber splitting, matrix and fiber breakage is the effective damage mode in the case of perforation.
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Key words:
- weft plain knitted structure /
- composites /
- VARTM /
- impact properties /
- damage mode
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