| 摘要 |
PROBLEM TO BE SOLVED: To provide a metal member and a metal structure excellent in fatigue crack development and propagation suppressing characteristics which are used for buildings, ships, bridges, construction machinery, offshore structures or the like, and its manufacturing method. SOLUTION: The metal member or the metal structure is formed in such a shape that a plate-like metal rib with a length of l, a height of h, and a thickness of t<SB>2</SB>is projected from a metal main plate or a metal main tube with a thickness of t<SB>1</SB>. The metal member or the metal structure is characterized by comprising a dent 6 with a compressive strain of≥0.5 and≤25% in a plate thickness direction at a position 5 apart a distance (a) of≥t<SB>2</SB>/4 and≤4×t<SB>2</SB>from a rib plate end part 4 where the main plate or the main tube crosses the rib in a direction parallel to an outside maximum tensile stress, the length b of the dent is such that the length (b) thereof from that position is≥t<SB>2</SB>/4 and≤4×t<SB>2</SB>in the direction parallel to the outside maximum tensile stress, and the length L thereof in a direction vertical to the outside maximum tensile stress with respect to that position is≥t<SB>2</SB>/2 and≤(5/8)W, and a compressive residual stress acts on the rib plate end part where the main plate or the main tube crosses the rib plate by the dent 6. COPYRIGHT: (C)2007,JPO&INPIT
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