ANALYTICAL METHOD OF SOLUTION ON DELAMINATION IN SYMMETRICAL ORTHOGONAL COMPOSITE LAMINATED CURVED BEAMS

Using the principle of superposition, the transverse loading state of a laminated curved beam with delaminations is divided into in mid-surface and out-off mid-surface loading states. Furthermore, the out-off mid-surface loading state is subdivided into the transverse loading state acting on a curved beam without delamination and the additional shear loading state which is applied along the delamination surfaces of the laminated beam. Therefore, the problem of delamination can be changed to the analysis about the additional displacements and stresses, which are caused by the additional shear loading. Then, a simple mechanics model about delamination is established. Finally, the analytical solutions of additional displacements and stresses are determined by the theory of engineering beam, and the stress intensity factor is obtained by the energy release rate method.