METHOD OF STATE DECOMPOSITION AND SLICE COMPOSITION ON RECTANGULAR DELAMINATION IN COMPOSITE LAMINATE

The transverse loading state of a laminate with rectangular delaminations is divided using the principle of superposition, so that the problem of delamination can be reduced to the analysis about the additional displacements and stresses which are caused by the additional shear loading acting on the delamination surfaces; then a simple mechanics model about delamination area is established. The laminate sections parallel to the boundary of delamination area can be regarded as laminated beams with delaminations, the displacements of which can be expressed by the analytical solutions of additional displacements in the above beams. By this way, the additional displacement fields satisfying the displacement boundary condition of delamination area can be established. Finally, a closed form solution of additional displacements is obtained by the principle of minimum potential energy. The above results are compared with the convergent solutions obtained by the method of trigonometric series. It shows that