The investigation on the effects of cutting edge geometry on delamination of drilled composite laminate

Delamination is the main defect caused by drilling of composite laminates. This phenomenon endangers integrity and strength of structure as well as assembly procedure. This defect is the reason of 306 of re7ections during the uality control process. Several approaches are presented to decrease delamination, however the geometry of drill bit is still under consideration. In this paper, the effect of cutting edge geometry of twist drill bit is investigated, experimentally. The result demonstrated that the grinding of drill bit point can improve the performance, considerably.