The Role of Crack Closure on Fatigue Threshold at Elevated Temperatures

• NISHIKAWA Izuru

  Faculty of Engineering Science, Osaka University

• GOTOH Tsuyoshi

  Mazda Co. Ltd.,

• MIYOSHI Yoshio

  Faculty of Engineering Science, Osaka University

• OGURA Keiji

  Faculty of Engineering Science, Osaka University

抄録

Near threshold fatigue crack growth and crack closure were investigated in SS 41, SM 41 A, SUS 304 steels and A 2218-T 6 Aluminum alloy at elevated temperatures up to 500℃. Emphasis was placed on examining the role of crack closure on fatigue threshold at elevated temperatures. The fatigue threshold,Δ K_<th> , was found to increase with increasing test temperature in all the steels tested, while it was found to decrease in A 2218-T 6 Aluminum alloy. Oxide-induced crack closure was found to play an important role in the in crease of ΔK_<th> at elevated temperatures in SM 41 A, while it was found to play a less important role in SS 41 and SUS 304. It was concluded that oxide products on the fracture surface enhance crack closure only when the CTOD at threshold remains small at elevated temperatures.

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 (1), 92-99, 1988-01-15

  一般社団法人日本機械学会

キーワード

• Fatigue threshold
• Crack,closure
• Elevated temperature
• Oxide product
• Fracture surface roughness

詳細情報

• CRID: 1571135652144370816
• NII論文ID: 110002348400
• 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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