Crack arrestor means to prolong the life cycle of the crack. There are many methods has been studied to arrest crack but the use of a kerf as a crack arrestor has not been widely studied. Initial study has stated that the value of SIF at the crack tip can be reduced with the presence of the kerf in the same body, but detail dimension of the kerf that will produce best arresting effect is unknown. The finite element analysis was used to model the finite plate which contains different kerf geometries and a crack to obtain crack's tip stress intensity factor. Four types of kerf's configuration have been considered which are; single central kerf, double central kerf, single edge kerf and double edge kerf. Each type used different kerf's geometries selection that is predicted will produce higher kerf-crack interaction. The results of SIF were calculated as a percentage reduction when compared to SIF of a single edge crack without any kerf. Results show double edge kerf type is the most suitable for crack arrestor. Maximum percentage SIF reduction of 34.27% can be achieved when the crack is the shortest and separation to width ratio equal to 0.1. If the longer crack is detected on a structure, highest percentage SIF reduction can be achieved by fabricating maximum kerf length with separation to width ratio in the range of 0.15 and 0.25.
