A7079-T6高強度アルミニウム合金の圧延方向が破壊靭性および疲労き裂伝ぱに及ぼす影響

概要

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The fracture toughness and the fatigue fracture toughness of the A7079-T6 high strength aluminum alloy were examined, respectively in the right-angled direction to the macro flow (direction of LT) and in the direction of the macro flow (direction of TL), and found the safe design basis. As a result, the plane strain fracture toughness K_<IC> in the direction of TL is 10% low compared with that in the direction of LT , and fatigue fracture toughness value K_<fc> in the direction of TL is 15% low compared with that in the direction of LT. If plane strain fracture toughness in the direction of TL, exactly K_<IC>=23.7MPa√m, is substituted, elements of structures can be designed safely. As for the crack growth in the direction of LT, it tends to grow at a slant by the resistance of macro flow in the latter half of stable crack growth period, and the shear lips are also large just around fracture.