On the characteristic damage state for composite laminates based on analysis of the interfacial stresses

摘要

An exact solution for stresses and strains in composite laminates with the lay-up [0°m/90°n] is presented in this paper.First,the shear stresses between the 90° and 0° plies are assumed to be in the form of series expansion of sinusoidalfunctions.Then the stress components in laminates have corresponding series expressions based on equilibrium equations,boundary conditions and continuous conditions at the interface.Use of the principle of minimum potential energy leads to the algebraic equations for unknown coefficients in series.Further,cyclic differential function is introduced to express analytically the resulting stresses in laminates.As an application,reduction of Young's modulus and change in Poisson's ratio for various laminates are evaluated and compared with experimental and predicted results available.The results show that the present solution is accurate enough in computation,and suitable to exact analysis of characteristic damage state for composite laminates.