溶接継手の疲労き裂伝ぱ挙動に及ぼす試験片寸法および予荷重履歴の影響

概要

論文の詳細を見る
The effects of specimen size and preload history on the fatigue crack growth behavior of welded joints were examined in connection with residual stresses. As a crack propagates from a tensile residual stress field, the crack growth rate is insensitive to specimen size, because the crack tip always opens due to residual stress. As a crack propagates from a compressive residual stress field, however, the crack growth rate decreases with increasing spcimen size. Preload history is found to have a reduction effect on residual stresses. The crack growth rate of the welded specimens which were preloaded above 70% of their yield stress shows a tendency to approach the crack growth rate of the base metal. The crack growth rate in the welded joints is correlated with ΔK_<effR> which takes into account the residual stresses and stress ratio effect of the bese metal.
1988-05-25