Analytical method of solution on delamination in symmetrical orthogonal composite

By using the principle of superposition, the transverse loading was divided into symmetric and anti-symmetric states and the anti-symmetric loading was subdivided further into anti-symmetric transverse loading state acting the beam without delamination and the additional shear loading state, which is applied along the delamination surfaces of the beam, so the mechanical model of delamination beam was built, and the problem of delamination was reduced to analysis about the additional displacement and stress. The analytical solution of displacement and stress may be determined by the theory of engineering beam. The stress intensity factor of crack in layer was found by the energy release rate method.