Computation Of The Sif For Repaired Semi-circular Surface Cracks In Finite-thickness Plates With Bonded Composite Patch

In this paper, the analysis of the behavior of surface cracks in finite-thickness plates repaired with bonded composite patch subjected to traction effect is performed using three-dimensional finite element methods. The stress intensity factor at the crack-front was used as the fracture criteria. The stress intensities at the internal and external positions of repaired surface crack were compared. The effects of the mechanical and geometrical properties of the adhesive layer and the composite patch on the variation of the stress intensity factor at the crack-front were analyzed. The obtained results show that the presence of the bonded composite repair reduces significantly the stress intensity factor, which can improve the life span of the structure.