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

Abstract

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

CLC Number:

TB332

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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