레이저 패턴 각인을 이용한 이종접합 복합재료의 접착계면인성 향상에 관한 연구

Abstract

Hybrid composites generally are composed of FMLs (Fiber Metal Laminates) and PMC (Polymer Matrix Composite) in various ways in existing industrial sites. In particular, FMLs in which aluminum is laminated as a metal reinforced layer are widely used. Also, GFRP and CFRP (glass and carbon fiber reinforced plastics) are generally applied as fiber laminates. When the molding fabrication is performed using a hot press, the bonding toughness between the aluminum and fiber laminate interface layer is weak and thus delamination fractures in the interface easily occur. The object of this study is to present a simple method for strengthening the bonding interface toughness between the aluminum metal and GFRP layer of hybrid composites when using a hot press. The surfaces of the aluminum interface layer are engraved with 3 kinds of patterns by using the laser machine before the hot press works. And the most proper pattern type for the improved Al/GFRP hybrid laminate composites is determined. The interfacial toughness evaluation was measured by the energy release rate (G) using an asymmetric double cantilever bending specimen. From the experimental results, the STP (strip type) pattern was shown to have the most proper shape in Al/GFRP hybrid composites. And this will be considered as useful data for safety assessment of Al/GFRP hybrid composite structures.