샌드위치 복합재료의 처짐과 파손특성 향상을 위한 계면 구조

A method of improving mechanical performance of a sandwich structure that is manufacture by vacuum assisted resin transfer molding (VARTM) process has been proposed. When a closed-cell foam is employed, penetration of resin into the foam is limited to cells opened by cutting. A two-dimensional array of holes is made on the surface of the foam to enhance interfacial strength. A device to create the hole array is devised and built. Experimental investigations have been conducted for different hole depths. Specimens have been manufactured by a VARTM process and then tested by the three-point bending. The results show increased stiffness and strength. Moreover, the location of fracture has been moved away from the interface toward to the center.