Abstract: Based on the general six-degrees-of-freedom plate theory and the accurate stress analysis, using the variational principle and the equivalent strain theory in damage mechanics, the three-dimensional non-linear equilibrium differential equations for the interlaminar stresses of laminated plates with the damage effect of the intra-layers and the interlaminar interface are derived in the framework of the theory of elasticity. With a simply supported laminated beam-plate with damage as an example, an analytical solution is presented by using finite difference method to obtain the interlaminar stresses.

Key words: geometric nonlinearity, accurate stress analysis, interfacial damage, interlaminar stress