微拉曼光谱研究碳纤维/微滴和聚乙烯纤维/微滴的微观力学行为

复合材料科学与工程 ›› 2015, Vol. 0 ›› Issue (1): 23-27.

微拉曼光谱研究碳纤维/微滴和聚乙烯纤维/微滴的微观力学行为

邓李慧^1,2, 陈淙洁^1,2, 陈师^1,2, 夏少旭^1,2

1.东华大学纤维材料改性国家重点实验室,上海201620;
2.东华大学,上海201620

收稿日期:2014-05-13 出版日期:2015-01-28 发布日期:2021-09-14
通讯作者: 吴琪琳,女,博士,研究员,wql@dhu.edu.cn。
作者简介:邓李慧(1989-),女,硕士,主要从事复合材料界面微观力学方面的研究,denglihui318@126.com。本文作者还有史燕妮^1,2和吴琪琳^1,2*
基金资助:
国家自然科学基金(60975059);上海市教育委员会科研创新项目(14ZZ069)

MICROMECHANICS ANALYSIS ON FIBER/EPOXY MICRODROPLET BY MICRO-RAMAN SPECTROSCOPY-CARBON FIBER AND POLYETHYLENE FIBER

DENG Li-hui^1,2, CHEN Cong-jie^1,2, CHEN Shi^1,2, XIA Shao-xu^1,2

1. State Key Laboratory for Modification of Chemical Fibers and Polymer Materials,Donghua University,Shanghai 201620, China;
2. Donghua University, Shanghai 201620, China

Received:2014-05-13 Online:2015-01-28 Published:2021-09-14

摘要/Abstract

摘要： 使用微滴拉伸试验研究碳纤维、聚乙烯纤维/基体界面的微观力学性能,着重分析树脂微滴端部角大小分别对两种纤维/树脂微滴的界面微观力学行为的影响。发现在不同端部角下,两种纤维/树脂微滴界面的应力分布和应力传递不同。碳纤维/树脂微滴中的残余应力分布呈“W”型、外载拉伸应力分布呈“M”型,界面应力传递效率达到70%;而聚乙烯纤维/树脂微滴中的残余应力分布呈“M”型,外载拉伸应力分布呈“W”型,界面应力传递效率只有13%。根据力学模型得到的相应的剪应力分布都呈反对称分布,在纤维嵌入端存在剪应力集中,且碳纤维所受的剪应力远大于聚乙烯纤维。

关键词: 界面应力, 微滴端部角, 微拉曼光谱, 碳纤维, 聚乙烯纤维

Abstract: The effect of geometry on interfacial micromechanical behaviors of fiber/matrix microdroplets is investigated by microbond test and micro-Raman spectroscopy.The interfacial micromechanics of single carbon fiber(CF)/epoxy microdroplet and polyethylene fiber (PE fiber)/microdropletare were investigated. The study indicates that interfacial edge angle can affect the stress distributions in the different fibers/matrix microdroplets.The residual stress distribution and axial stress distribution caused by applied load of different end angles for carbon fiber/epoxy interface are W-and M-shaped respectively. Whereas,those for PE/epoxy interface are M-and W-shape respectively. The stress transfer efficiency is 70% for carbon fiber/epoxy, but it is only 13% for PE fiber case. Furthermore, interfacial shear stress has been acquired, which presents an antisymmetric distribution. Shear stress concentration locates at the ends of microdroplet. And shear stress of carbon fiber/epoxy is larger than that of PE fiber/epoxy.

Key words: interfacial stress, end angles of microdroplet, micro-Raman spectroscopy (MRS), carbon fibers, PE fibers

中图分类号:

TB332

邓李慧, 陈淙洁, 陈师, 夏少旭. 微拉曼光谱研究碳纤维/微滴和聚乙烯纤维/微滴的微观力学行为[J]. 复合材料科学与工程, 2015, 0(1): 23-27.

DENG Li-hui, CHEN Cong-jie, CHEN Shi, XIA Shao-xu. MICROMECHANICS ANALYSIS ON FIBER/EPOXY MICRODROPLET BY MICRO-RAMAN SPECTROSCOPY-CARBON FIBER AND POLYETHYLENE FIBER[J]. COMPOSITES SCIENCE AND ENGINEERING, 2015, 0(1): 23-27.

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