科研之友
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摘要
This paper uses a modified shear-lag model taking account of the tensile load of the matrix to study the stress concentrations in unidirectional composites containing interfacial damage between fibres and matrix, and discusses the influence of the interfacial shear strength and of the matrix-to-fibre tensile stiffness ratio on both the stress concentrations and lengths of damaged regions at the interface. The computed results show that the stress concentrations in intact fibres adjacent to cut fibres and matrix elements can be effectively reduced by shear yielding or debonding at the interface, and can be increased as the interfacial shear strength and the matrix-to-fibre stiffness ratio increase. The lengths of damaged regions at the interface are decreased as the interfacial shear strength is increased, but increased as the matrix-to-fibre stiffness ratio is increased.
