超薄UHMWPE纤维插层对碳纤维层合板力学性能的影响

doi:10.19936/j.cnki.2096-8000.20241128.010

摘要/Abstract

摘要： 为了提高超薄碳纤维复合材料单向层合板(UDLs)的延展性,本文制备了同等厚度的CF/UHMWPE混杂单向层合板和超薄碳纤维单向层合板,并测试两种层合板的力学性能,观测试样拉伸断裂后断口的微观形貌。结果表明:CF/UHMWPE混杂单向层合板平均抗拉强度达到1 695 MPa,在发生拉伸损伤后,UDL仍然具有1 560 MPa载荷持续作用10 s的承载能力。与超薄碳纤维层合板相比,混杂单向层合板虽然平均拉伸强度降低了11.6%,但其平均伸长率提高了7.1%。混杂试样在拉伸测试时没有出现脆断破坏,其宏观拉伸断口形貌中的劈裂现象有所减少。混杂单向层合板的抗拉强度降低与碳纤维的体积分数减小有关,但作为插层结构的UHMWPE纤维提高了混杂单向层合板的伸长率。微观结构上,超薄UHMWPE纤维插层阻碍相邻碳纤维层的脆性破坏,抑制了层合板中裂纹的产生以及扩展,从而提高了层合板整体的延展性。实验结果为进一步开发和设计高延展性混杂复合材料提供了基础。

关键词: 超薄UHMWPE纤维插层, 碳纤维层合板, 层间混杂, 拉伸性能, 断裂形貌, 复合材料

Abstract: In order to improve the ductility of ultra-thin carbon fiber composites unidirectional laminates (UDLs), both CF/UHMWPE hybrid and ultra-thin carbon fiber UDLs with the same thickness were prepared. Their mechanical properties were tested, and the micro-morphology of the specimens was observed after tensile fracture in this paper. The results show that the average tensile strength of CF/UHMWPE hybrid UDL reaches 1 695 MPa, and the UDL presents a capacity withstanding 1 560 MPa load for 10 s after tensile damage occurred. Compared to ultra-thin carbon fiber laminates, although the average tensile strength of the hybrid UDLs is reduced by 11.6%, their average elongation is increased by 7.1%. The hybrid specimens do not develop brittle fracture damage during tensile testing, and the splitting phenomenon of the UDLs under macroscopic morphology is reduced. The decrease in tensile strength of the hybrid UDL is related to the lower volume fraction of carbon fibers, but the UHMWPE fibers, which were used as the inserted phase, increased the elongation of the hybrid UDL because of its good ductility. Microstructurally, the inserted ultra-thin UHMWPE fiber layer inhibits the generation and expansion of the cracks in the UDL and suppresses the brittle fracture of the adjacent carbon fiber layers, which improves the overall ductility of the hybrid UDL. The experimental results provide the basis for designing highly ductile hybrid composites further.

Key words: ultra-thin UHMWPE fiber intercalation, carbon fiber laminates, interlayer mixing, tensile properties, fracture morphology, composites

中图分类号:

TB332

宗文波, 张竹青, 吴怡晓, 张峻滔, 梁霞, 吴海宏. 超薄UHMWPE纤维插层对碳纤维层合板力学性能的影响[J]. 复合材料科学与工程, 2024, 0(11): 76-81.

ZONG Wenbo, ZHANG Zhuqing, WU Yixiao, ZHANG Juntao, LIANG Xia, WU Haihong. Effect of ultra-thin UHMWPE fiber insertion on the mechanical properties of carbon fiber laminates[J]. COMPOSITES SCIENCE AND ENGINEERING, 2024, 0(11): 76-81.

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