氧等离子体改性超高分子量聚乙烯纤维复合材料层间损伤声发射特征分析  

Analysis of interlayer damage acoustic emission characteristics of oxygen plasma modified ultra-high molecular weight polyethylene fiber composite materials

作　　者：陈露 吴孟锦 贾立霞[1,2] 阎若思[1,2] CHEN Lu;WU Mengjin;JIA Lixia;YAN Ruosi(Hebei Technology Innovation Center for Textile and Garment,Hebei University of Science and Technology,Shijiazhuang,Hebei 050018,China;Hebei Key Laboratory of Flexible Functional Materials,Hebei University of Science and Technology,Shijiazhuang,Hebei 050018,China)

机构地区：[1]河北科技大学河北省纺织服装技术创新中心,河北石家庄050018 [2]河北科技大学河北省柔性功能材料重点实验室,河北石家庄050018

出　　处：《纺织学报》2023年第7期116-125,共10页Journal of Textile Research

基　　金：国家自然科学基金青年基金项目(12202133);河北省高等学校科学技术研究项目(ZD2022025);河北省青年拔尖人才支持计划项目([2018]-27)。

摘　　要：为研究氧等离子体改性超高分子量聚乙烯(UHMWPE)/乙烯基酯复合材料层间断裂韧性的损伤模式对其界面性能的影响,首先对不同密度UHMWPE织物进行氧等离子体改性,使用真空辅助树脂灌注成型工艺制备UHMWPE/乙烯基酯复合材料,结合声发射(AE)检测技术对复合材料的Ⅰ型层间断裂韧性(G_(ⅠC))和Ⅱ型层间断裂韧性(G_(ⅡC))进行测试,并对其损伤动态演变过程进行表征和定位。结果表明:界面性能是复合材料层间断裂韧性的主导因素,在G_(ⅠC)和G_(ⅡC)测试过程中,通过在UHMWPE/乙烯基酯复合材料层间预裂纹处产生应力集中,损伤机制表现为张开型和滑移型;低经密UHMWPE织物结构松散,具有良好的改性均匀度,经氧等离子体改性后其制备的复合材料的G_(ⅠC)和G_(ⅡC)分别提高约36.8%~80%、75%~1120%,达到层间增韧效果,同时由于界面结合性能提高,不同损伤模式减少或消除;通过对声发射信号进行聚类分析可有效识别出复合材料基体开裂、纤维/基体脱黏和纤维断裂3种损伤模式及其特征频率范围。Objective As a lightweight fiber-reinforced composite material with high strength and modulus,ultra-high molecular weight polyethylene(UHMWPE)plays an important role in modern aviation,aerospace,marine defense equipment,and other fields.Because its smooth surface is chemically inert and does not contain polar groups,the poor binding with the resin matrix would affect its interface performance.The chemical composition reconstruction on the surface of UHMWPE fiber was carried out by oxygen plasma modification,which effectively provided more polar sites for the interface layer to improve the interface binding performance between UHMWPE fiber and resin matrix.Method In order to investigate the influence of damage mode on interlayer fracture toughness of oxygen plasma modified UHMWPE/vinyl ester composites.UHMWPE plain fabrics with a weft density of 200 picks/(10 cm)and warp density of 160,200 and 240 picks/(10 cm)were woven and modified by oxygen plasma.UHMWPE/vinyl ester composites were prepared by vacuum-assisted resin infusion molding(VARI).Mode I(G_(ⅠC))and modeⅡ(G_(ⅡC))interlayer fracture toughness tests were carried out.The damage patterns were analyzed by the acoustic emission(AE)technique.Results After oxygen plasma modification of UHMWPE fabrics,the water contact angle of the fiber surface was found to be reduced(Fig.2),improving surface energy.For G_(ⅠC),the maximum loads of G_(ⅠC)of samples U03 and P03 were 19.49 and 27.05 N,respectively.It was found that the plasma modified G_(ⅠC)of sample P03 by 36.8%,and the modeⅠinterlayer fracture angles of samples P01 and P03 were 26°and 10°,respectively(Fig.3).P01 displayed the greatest change in interlayer fracture angle.The G_(ⅠC)of UHMWPE/vinyl ester composites was mainly related to the interfacial bonding properties,the woven fabrics structure,the state of the pre-crack tip,and the brittleness of the matrix.During the G_(ⅠC)test,AE cumulative energy of UHMWPE/vinyl ester composites increased as the warp density of UHMWPE fabric increased(Fig.

关 键 词：等离子体改性 超高分子量聚乙烯 乙烯基酯 声发射检测 复合材料 层间断裂韧性 界面性能 

分 类 号：TB332[一般工业技术—材料科学与工程]