stress intensity factor for cracked sheets with broken hole using cfrp

the use of stopper holes is one of the easiest methods to reduce the stress intensity factor at the tip of the crack and thus reduce the growth rate of the crack. the effectiveness of stopping holes in inhibiting crack growth is considered based on their effect on stress intensity coefficients. the numerical results indicate that the position and size of the stopping holes influences the amount of crack stress intensity coefficient. by increasing the size of the holes on both sides of the crack and decreasing their horizontal and vertical distances from the crack tip, the intensity of the stress intensity is also increased. however, fatigue cracks usually occur in places where excavation of the cavity in required dimensions due to geometric constraints is not feasible. in such a situation, crack may start again from the hole. hence, there is a need to reinforce broken holes. in the present study, a combination of cracked cavities and carbon-fiber reinforced polymers (cfrp) under static loads was studied using finite element analysis (fea) to evaluate its potential as a modification technique. the steel plate with the primary center crack under static tensile loading (mode i) was considered. the holes of both sides of the cracks were molded and cfrp pieces were applied on each side of the cracks. ansys software used in order to perform numerical analysis.