抄録
Research and development on a composite material named as Fiber-Metal Laminates (FML) for its airplane structural application are recently paid much attention. To date, a typical FML is GLARE (Glass Laminate Aluminum Reinforced Epoxy) which laminates the aluminum alloy (Al) and the Glass-fiber reinforced plastic (GFRP) together. However, the interlaminar fracture toughness between Al and GFRP layer is usually very low, and interface damage occurs easily and results in a remarkable compressive strength reduction. In this work, interlaminar mechanical properties of GLARE are improved by acid treatment to Al and adding Vapor Grown Carbon Fiber (YGCF) between Al and GFRP layer. The influence of VGCF addition on mechanical properties of GLARE, i.e., Mode-II properties, is examined by ENF tests. On the surface of Al plate, the "line" induced by rolling machining process appears clearly after acid treatment. The specimens in which this "line" and glass fibers are in parallel, are named as "-0°", and those in which the two directions are vertical are called as "-90°". Furthermore, VGCF addition amount is changed as 0, 10, 20 and 30 g/m^2. The influence of the addition amount on interfacial mechanical properties is investigated. From the results of ENF tests for Mode-II properties, when 10g/m^2 of VGCF are added between Al and GFRP layer in GLARE, critical load (Pc) and critical strain energy release rate in Mode-II are increased most significantly. Moreover, the dependence of interlaminar mechanical properties on the "line" direction becomes more clearly by adding VGCF.
