Analysis of ply-wise failure of composite laminates with open holes

Fiber-reinforced composite materials may contain open holes according to the needs of service conditions. This research aims to determine the effect of the shape and size of the open-holes on the compressive strength of the carbon fiber/epoxy laminated composite material. The mechanical properties and the open-hole compressive failure of the laminate were introduced first. The experimental study was simulated with Finite element analysis and the difference between the experimental and numerical methods used to determine the compressive strength were compared. The results showed that the failure starts with matrix shear failure at the interface between the consecutive plies that have the greatest angle difference in fiber directions. The angle difference between the load and the reinforcement fibers is also important in determining the interface where the damage occurs. In terms of compressive strength, the shape and orientation of the holes are at least as important as the size of the holes.