レーザ干渉法を用いたSUS304鋼における下限界近傍での高温疲労き裂伝ぱ挙動の検討 : 第1報, き裂開閉口挙動

概要

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Fatigue crack growth tests using center-cracked specimens [M (T) specimens] of SUS304 steel were conducted to examine the behavior of fatigue crack growth in the near-threshold regime at 450,550,650,and 700℃. Using the interferometric strain/displacement gage (I.S.D.G.), the crack closure behavior, which was thought to be significant due to oxide film accumulated on crack surfaces, was examined. It was shown that the crack closure level was measured with good accuracy even at high temperatures by I.S.D.G. modified using a platinum plate and a filter. It was found from the behavior observed at 650℃ that crack closure did not occur at R=0.5,and that changes in the behavior of crack growth rate, da/dN, corresponded to those in the behavior of crack opening ratio, U, at each test temperature.
社団法人日本機械学会の論文
1997-06-25