Stress transfer around a broken fiber in unidirectional fiber-reinforced composites considering matrix damage evolution and interface slipping

查看全文 作　　者：YANG [1]Zhong;ZHANG [1,2]BoMing;ZHAO [1]Lin;SUN [1]XinYang

机构地区：[1]Center for Composite Materials. Harbin Institute of Technology. Harbin 150001. China;[2]School of Materials Science and Engineering. Beihang University. Beijing 100191. China

出　　处：《Science China(Physics,Mechanics & Astronomy)》索引2011年第54卷第2期,共7页

摘　　要：A shear-lag model is applied to study the stress transfer around a broken fiber within unidirectional fiber-reinforced composites(FRC) subjected to uniaxial tensile loading along the fiber direction.The matrix damage and interfacial debonding,which are the main failure modes,are considered in the model.The maximum stress criterion with the linear damage evolution theory is used for the matrix.The slipping friction stress is considered in the interfacial debonding region using Coulomb friction theory,in which interfacial clamping stress comes from radial residual stress and mismatch of Poisson's ratios of constituents(fiber and matrix).The stress distributions in the fiber and matrix are obtained by the shear-lag theory added with boundary conditions,which includes force continuity and displacement compatibility constraints in the broken and neighboring intact fibers.The result gives axial stress distribution in fibers and shear stress in the interface and compares the theory reasonably well with the measurement by a polarized light microscope.The relation curves between damage,debonding and ineffective region lengths with external strain loading are obtained. 关键词：复合材料基体纤维增强界面脱粘损伤演化应力传递破碎单向滑动

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Stress transfer around a broken fiber in unidirectional fiber-reinforced composites considering matrix damage evolution and interface slipping

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