123 CFRP/チタン薄膜ハイブリッド積層板の引張強度に及ぼす界面破壊靱性の方向依存性の影響

抄録

The effects of direction dependent interfacial fracture toughness on the tensile strength of CFRP / thin titanium films hybrid laminates are evaluated by tensile and fracture toughness tests. In tesile tests, the fiber-metal laminates which have the 90° ply-titanium interface shows lower tensile strength compared to the CFRP laminates, because the 90° ply-titanium interfacial delamination occurs. It is interesting to note that the FML which has no 90° ply-titanium interface shows higher tensile strength as well as the CFRP laminates, this may be because there are no interfacial delamination. In three-point bending tests, two types of the interfacial fracture toughness which are 0° ply-titanium interface and 90° ply-titanium interface are evaluted. As a result, the 0° ply-titanium interface shows a higher interfacial fracture toughness than that of the 90° ply-titanium interface. Thus, it is possible to suppress delamination by inserting titanium films in adjacent with the 0° plies, results in improved tensile strength.