Near-Threshold Fatigue Crack Growth Behavior of SUS304 Steel at High Temperatures Using Interferometric Strain/Displacement Gage : 1st Report, Crack Closure Behavior

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概要

• 論文の詳細を見る

• Interferometric strain-displacement gauge(I.S.D.G.) testing system was developed for the measurement of the crack opening displacement at high temperatures. Helium-Neon gas laser and center-cracked specimens of type SUS304 austenitic stainless steel were used. Fatigue crack growth tests were conducted at 450, 550, 650 and 700℃ at stress ratios of R=-0.1 and 0.5. Using I.S.D.G.for the measurement of crack closure modified using platinum plate and optical filter, crack opening displacement was found to be measured with good accuracy at all temperatures tested. Results showed that crack closure was observed at R=-0.1, while no crack closure was observed at R=0.5 even at 650℃. From the results of the measurement of fatigue crack closure in the near-threshold regime at all temperatures investigated, it was found that rapid increase and decrease in crack growth rate da/dN were observed when crack opening ratio U showed rapid increase and decrease, respectively.

• 一般社団法人日本機械学会の論文
• 1999-01-15

著者

• Kacou T.a.p.

  Department Of Mechanical Engineering Osaka University

• Ohji K

  Department Of Mechanical Engineering And Systems Graduate School Of Engineering Osaka University

• Ohji Kiyotsugu

  Department Of Mechanical Engineering Faculty Of Engineering Osaka University

• Nakai Yoshikazu

  Department Of Mechanical Engineering Faculty Of Engineering Kobe University

• Nakai Yoshikazu

  Department Of Biotechnology Tokyo University Of Agriculture & Technology

• TAMURA Eiichi

  Department of Mechanical Engineering, Graduate School, Osaka University

• KUBO Shiro

  Department of Mechanical Engineering and Systems, Graduate School of Engineering, Osaka University

• SHIOTANI Shoji

  NKK Co.Ltd.

• KACOU Tanoh

  Formerly, Department of Mechanical Engineering, Graduate School, Osaka University

• Kubo Shiro

  Department Of Mechanical Engineering And Systems Graduate School Of Engineering Osaka University

• Tamura Eiichi

  Department Of Mechanical Engineering And Systems Graduate School Of Engineering Osaka University

• Ohji Kiyotsugu

  Department of Mechanical Engineering and Systems, Graduate School of Engineering, Osaka University

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