Page 15 of the July/August issue of Composites Manufacturing Magazine states that drilling a hole [in FRP] leads to failure initiation points and weakened joints, as follows:
“Drilling a hole in composites sacrifices up to 60 percent of the load carrying capacity. The minute you drill a hole, the fibers become discontinuous, you create stress concentrations around the hole, and you cause delamination, all of which act as failure initiation points, thereby weakening the resulting joints.”
— Composites Manufacturing Magazine, July/August 2017, page 15
