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超高分子量聚乙烯架桥纤维与裂缝的交互微观力学 被引量:1

Interfacial micromechanics analysis on the ultrahigh molecular weight polyethylene bridging fibers crossing cracks
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摘要 使用拉曼光谱研究了架桥纤维与裂缝微观力学,以超高分子量聚乙烯(UHMWPE)纤维为例,将纤维搭桥试样进行微拉伸试验,着重分析架桥纤维的止裂作用和架桥纤维/环氧树脂界面的应力分布,并对不同位置架桥试样的裂缝扩展速度和应力分布进行分析,并进一步运用剪切滞后模型,对架桥纤维在不同拉伸载荷下的应力分布进行了拟合分析,结果表明:架桥纤维能够分散部分外载应力,对于裂纹扩展具有显著的止裂作用。在低于UHMWPE纤维最大应变拉伸时,发现在裂缝中心位置处架桥纤维所承受的应力最大,其应力不超过2GPa,而基体树脂的应力可达到12GPa,架桥纤维/基体界面的应力传递达不到100%。以UHMWPE为架桥的应力传递模型呈"正抛物线"型,应力分布存在于粘结区、脱粘区和架桥区。 The micro-Raman spectroscopy was used to investigate the micromechanics of the ultrahigh molecular weight polyethylene(UHMWPE)bridging fiber crossing crack.The crack-arrest of the bridging fiber and the stress distribution of the interface between the bridging fibers and epoxy were mainly discussed by the micro-tension test coupled with Raman scanning.The crack propagation speed and the stress distribution of the specimens in different positions were also analyzed,and the shear-lag model was proposed to fit the stress distribution of bridging fibers at different tensile.The results show that bridging fibers,by dispersing partial external stress,can effectively withstand the propagation of crack.When the tensile strain is lower than the maximum strain of the UHMWPE fiber,the maximum stress on the bridging fibers existing at the crack center position,is less than 2GPa,but the stress in the matrix is up to 12 GPa,which indicate the stress transfer value of fiber/matrix interface is less than 100%.The stress transfer model of UHMWPE bridging fibers is proposed to be parabola shaped,and the stress distribution of UHMWPE fiber exists in three zones,namely the bonded zone,the debonded zone and the bridging zone.
出处 《复合材料学报》 EI CAS CSCD 北大核心 2017年第7期1505-1510,共6页 Acta Materiae Compositae Sinica
基金 上海市教育委员会科研创新重点项目(14zz069) 国家重点研发计划项目(2016YFB0303201)
关键词 拉曼光谱 架桥纤维 裂缝 界面微观力学 应力传递 Raman spectroscopy bridging fiber crack interfacial micromechanics stress transfer
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