碳纤维复合材料在受到垂直于纤维方向的冲击时,易发生脆性断裂,导致结构完整性受损,进而产生安全隐患。为提升碳纤维层合板在低速冲击后的结构完整性,研究了不同层间混杂比例的碳纤维/超高分子量聚乙烯(CF/UHMWPE)纤维复合材料层合板的低速冲击性能。通过[0°/90°]n铺层方式制备了4种等厚度、不同混杂比的层合板,并对其低速冲击性能及冲击后的破坏形貌进行了分析。结果表明:随着UHMWPE纤维在层合板中的混杂比例增加,层合板的低速冲击性能呈现出先提升后下降的趋势。当CF/UHMWPE层合板的UHMWPE纤维层间混杂比例达到11%时,层合板在冲击后的结构完整性最佳,冲击性能最优,落锤冲击载荷3197N,吸收能量25.47J,冲击后压缩强度(CAI)达到135MPa。与纯碳纤维层合板相比,其冲击载荷、吸收能量和冲击后压缩强度分别提升了10.6%、15.6%和9.7%。冲击后的破坏形貌表明,在碳纤维层合板的层间适量引入UHMWPE纤维插层,能够有效延缓纤维的脆性断裂,抑制裂纹的生成与扩展,从而显著提升层合板的抗冲击性能和冲击后的结构完整性。
When subjected to impacts perpendicular to the fiber direction,carbon fiber composite materials tend to undergo brittle fracture,resulting in compromised structural integrity and potential safety hazards.To enhance the structural integrity of carbon fiber laminates after low-velocity impacts,this study investigated the low-velocity impact performance of hybrid laminates consisting of carbon fiber/ultra-high molecular weight polyethylene (CF/UHMWPE) with varying interlayer blending ratios.Four laminates with equal thickness but different blending ratios were prepared using a (0°/90°)n stacking sequence,and their low-velocity impact performance and post-impact failure morphology were thoroughly analyzed.The research findings revealed that the low-velocity impact performance of laminated panels initially improved and then declined as the mixing ratio of UHMWPE fibers increased.Optimal structural integrity and impact performance were achieved when the interlayer mixing ratio of UHMWPE fibers in CF/UHMWPE laminate reached 11%,resulting in drop weight impact load of 3197N,energy absorption of 25.47J,and post-impact compression strength (CAI) of 135MPa.Compared to pure carbon fiber laminate,these values represented improvements of 10.6%,15.6%,and 9.7%,respectively.The post-impact failure morphology indicated that incorporating an appropriate amount of UHMWPE fiber interlayers into carbon fiber laminate could effectively delay fiber brittle fracture,inhibit crack generation and propagation,thereby substantially enhancing their impact resistance and post-impact structural integrity.
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基金资助
“慧眼行动”创新成果转化应用项目(62602010237);国家重点研发计划重点专项(2016YFB0101602)
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