An adhesively bonded anisotropic structure containing a part-through crack subjected to in-plane mixed mode tractions is analyzed. The basic equations for estimating the stress intensity factors $K_1$, $K_2$ are presented.
The problem is reduced to a pair of Fredholm integral equations of the second kind. Shear stresses of the adhesive and the stress intensity factors in the cracked plate are obtained by solving these equations numerically.
Numerical results are presented for tension mode and shear mode for various fiber angles of composite plate, and the influence of debonding is presented for shear mode. The results show that both the mode I stress intensity factor and the model II stress intensity factor exist for tension mode or shear mode because of elastic unsymmetry of the structure. The results also show that debonding increases the mode II stress intensity factor under shear mode.
