繰返し大ひずみが溶接継手の疲労強度に及ぼす影響

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  • The Effect of Large Strain Cycling on the Fatigue Strength of Welded Joint
  • クリカエシ ダイヒズミ ガ ヨウセツ ツギテ ノ ヒロウ キョウド ニ オヨボス エイキョウ

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It is known that earthquake caused many damages particularly by the fatigue crack propagation at the welded joints of steel structures. The structures which has not been seriously damaged are still be used after the earthquake. The fatigue strength of these structures, however, might have been decreased due to the cyclic load during earthquake. In order to clarify the effect of large cyclic load on the fatigue strength of the welded joint of steel structure, high cycle fatigue tests after large cyclic straining on welded joints were performed. The results were analyzed by the fracture mechanics to evaluate the effect of fatigue crack due to the large cyclic straining on the high cycle fatigue strength of a welded joint. As a result of the experiment, it was made clear that a static large mean strain decreased the fatigue life but had little effect on the fatigue limit. The application of a large cyclic before high cycle fatigue, however, decreased the fatigue limit of welded joint depending on the size of cracks formed by the large cyclic strain.

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