유리섬유/알루미늄 혼성적층판의 인장특성과 파괴인성 평가

Abstract

Tensile properties and fracture toughness of monolithic aluminum, fiber reinforced plastics and glass tiber/aluminum hybrid laminates under tensile loads have been investigated using plain coupon and single-edge-notched specimens. Elastic modulus and ultimate tensile strength of GFMLs showed different characteristic behaviors according to the A1 kind, fiber orientation and composition ratio. Fracture toughness of A-GFML-UD which was determined by the evaluation of K_(IC) and G_(IC) based on critical load was similar to that of GFRP-UD and was much higher than monolithic A1. Therefore, A-GFML-UD presented superior fracture toughness as well as prominent damage tolerance in comparison to its constituent A1. By separating A1 sheet from GFMLs after the test, optical microscope observation of fracture zone of GFRP layer in the vicinity of crack tip revealed that crack advance of GFMLs depended on the orientation of fiber layer as well as A1/fiber composition ratio.