Growth Characteristics of Surface Fatigue Cracks of High-Tensile Strength Steel in Synthetic Seawater

• KOMAI Kenjiro

  Department of Mechanical Engineering, Kyoto University

• NOGUCHI Masatoshi

  Mitsubishi Metal Co.,

• OKAMOTO Hideki

  Shimadzu Co.,

抄録

Growth rates of surface fatigue cracks of high-tensile strength steels have been measured in ASTM synthetic seawater at a state of free corrosion and under a cathodic potential. The aspect ratio in synthetic seawater at a state of free corrosion was larger than that in air, while under a cathodic potential it was almost fixed and the same as that in air, while under a cathodic potential it was almost fixed and the same as that in air. At a state of free corrosion and at R=0.1, the crack growth rate to the inside exists under a plane-strain condition, and the O_2 concentration is lower than that near the surface. Following the initial growth, the da/dN and dc/dN were the same as that of a compact tension type specimen, both at a state of free corrosion and under a cathodic potential. Under a cathodic potential, the threshold values were remarkably high because the Ca^<+2> and Mg^<2+> deposit-induced wedge effect was conspicuous.

収録刊行物

• JSME international journal. Ser. 1, Solid mechanics, strength of materials

  JSME international journal. Ser. 1, Solid mechanics, strength of materials 31 (3), 613-618, 1988-07-15

  一般社団法人日本機械学会

キーワード

• Fatigue
• Surface Crack
• Aspect Ratio
• Ca^<2+> and Mg^<2+> Deposit-Induced Wedge Effect

詳細情報

• CRID: 1571698602097783808
• NII論文ID: 110002348457
• NII書誌ID: AA10680585
• ISSN: 09148809
• 本文言語コード: en
• データソース種別:
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