Abstract: The stress intensity factor of the crack tip for the cracked plate repaired with composite patches is still the focus of attention. At present, the majority study of the stress intensity factor is about thin plate. Therefore, based on the finite element method, the model of center-cracked thick (10mm) metallic plate bonded with composite patches was established, and the stress intensity factor of the crack tips were calculated. Meanwhile, Rose's analytical model was used here to verify the model. The changes of the SIF values and the repair effect along the thickness direction were analyzed. The results show that the finite element solution is conservative; the difference between the maximum and the minimum of the SIF along the thickness direction is significant when the thickness of the repaired plate is larger; the double repair is much better than the single repair.

Key words: center crack, composite repair, stress intensity factor, finite element methods