Effect of matrix yield properties on fragmentation behavior of single fiber composites

材料科学 复合材料 极限抗拉强度 环氧树脂 碎片(计算) 纤维 固化(化学) 计算机科学 操作系统
作者
Fang Zhao,Tomonaga Okabe,Nobuo Takeda
出处
期刊:Composite Interfaces [Taylor & Francis]
卷期号:9 (3): 289-308 被引量:12
标识
DOI:10.1163/156855402320257366
摘要

Abstract Experimental and theoretical investigations have been conducted to study the dependence of fiber fragmentation behavior on matrix yielding properties. The cured Epikote 828 resins with two types of curing agents have almost similar elastic moduli, but different tensile yield strengths. The interfacial chemistry between fiber and epoxy resin is unchanged due to the same constituent of the epoxy resin. The experimental results indicate that the fragmentation behavior of the fibers embedded in the matrix is significantly different for the tested glass fiber treated by γ-glycidoxypropyltrimethoxysilane. The average fragment length decreased with increasing tensile yield strength of resin, which suggests that the interfacial shear strength determined in the fragmentation test should be different depending on the tensile yield strength of resin used. The important phenomenon observed is the transition of the micro-damage mode from matrix crack to interfacial debonding. An elastoplastic shear-lag model was used to calculate the shear stress and fiber tensile stress distributions considering different plastic behaviors of the matrices. The theoretical results indicate that the plastic behavior of the matrix has a large influence on stress transfer. Based on elastic and plastic properties of the matrix, the fiber fragmentation behavior in the matrix is predicted. Experimental and theoretical results are favorably compared. Keywords: Fragmentation testplastic propertytensile yield strengthepoxy resinglass fiber
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