摘要
针对树脂基复合材料树脂粘接层脆性大且存在结构缺陷,易发生剥离和分层等突出问题,提出以轻质高强的芳纶pulp(AP)作为增强剂,通过模压成型制得强化的碳纤维增强树脂基复合材料(CFRP),研究不同添加面密度对复合材料抗钻孔、钻孔-冲击二次损抗性能和损伤后的抗压强度的影响。结果表明,6 g/m^(2)AP使复合材料直接、钻孔以及钻孔-冲击后抗压强度分别增强37.3%、41.0%和41.8%。分析认为:AP改善了树脂脆性,消除层间富树脂区域,提升层间断裂韧性,抑制了裂纹生长;同时AP以纤维桥连形式贯穿于树脂层和碳纤维层,不仅改善了树脂与碳纤维粘接界面的缺陷,也构建准Z方向的纤维排布,避免裂纹向单层界面扩展而导致结构分层,从而实现结构强化。
Aiming at the large brittleness of resin adhesive layer,structural defect of carbon fiber layer,prone to peeling and delamination,etc.the carbon fiber reinforced plastics(CFRP)with aramid pulp(AP)toughening were prepared by compression molding via using AP with high strength and toughness as interface enhancer.The effects of AP with different interface densities on the compressive strength,impact resistance and compressive strength after damages of CFRP were studied.The compressive strengths of directly testing,testing after impact,drill and drill-impact are improved by 37.3%,41.0% and 41.8% correspondingly for longitudinal CFRP with AP interface density of 6 g/m^(2).AP improves brittleness of resin,eliminates interlayer resin-rich region,toughens the interlayer toughness and suppressed cracks generation.The formed AP fiber-bridging structure throughout resin layer and carbon fiber layer not only remove the bonding interface defect,but also build quasi-Z fiber distribution to achieve tightly connected structure,which prevent cracks expanding along interlayer and delamination failure,thereby to achieve structure reinforced.
作者
程飞
蒋宏勇
CHENG Fei;JIANG Hongyong(Materials Science and Engineering,Southwest University of Science and Technology,Mianyang 621010,China;Mechanical and Vehicle Engineering,Hunan University,Changsha 410082,China)
出处
《复合材料学报》
EI
CAS
CSCD
北大核心
2021年第11期3610-3619,共10页
Acta Materiae Compositae Sinica
基金
西南科技大学科研基金(20zx7141,20zx7101)。
