Effect of microscopic residual stress on the characteristics on fatigue crack propagation of lamellar-microstructure steel

• Project/Area Number: 21760075
• Research Category: Grant-in-Aid for Young Scientists (B)
• Allocation Type: Single-year Grants
• Research Field: Materials/Mechanics of materials
• Research Institution: Osaka University
• Principal Investigator: MIKAMI Yoshiki Osaka University, 工学研究科, 助教 (40397758)
• Project Period (FY): 2009 – 2010
• Project Status: Completed (Fiscal Year 2010)
• Budget Amount: ¥2,470,000 (Direct Cost: ¥1,900,000、Indirect Cost: ¥570,000); Fiscal Year 2010: ¥910,000 (Direct Cost: ¥700,000、Indirect Cost: ¥210,000); Fiscal Year 2009: ¥1,560,000 (Direct Cost: ¥1,200,000、Indirect Cost: ¥360,000)
• Keywords: 層状組織鋼 / 疲労き裂進展特性 / 微視的残留応力 / ミクロ組織 / 相変態 / 変態膨張 / 強度不均質 / 数値シミュレーション / 繰返し応力 / インデンテーション

Research Abstract

A numerical simulation method to calculate microscopic residual stress distribution in lamellar microstructure steel was developed. The calculated microscopic residual stress was compressive in martensite phase and tensile in ferrite phase. Fatigue crack propagation path observed in experiments is reasonable in terms of the simulated results. Crack propagation analysis method under microscopic residual stress state was also developed. It was shown that the crack propagation rate decreases when compressive residual stress exists in martensitic phase.

Research Products

• [Journal Article] Numerical simulation of transformation-induced microscopic residual stress in ferrite-martensite lamellar steel (2009)
  • Author(s): Y.Mikami, A.Inao, M.Mochizuki, M.Toyoda
  • Journal Title: Journal of Physics : Conference Series Vol.165, No.1 Pages: 12080-12080
  • Peer Reviewed
• [Presentation] フェライト・マルテンサイト層状組織鋼の相変態誘起型微視的残留応力とその疲労き裂進展特性向上に及ぼす影響 (2011)
  • Author(s): 三上欣希
  • Organizer: 日本船舶海洋工学会材料・溶接研究会
  • Place of Presentation: 文京区(東京都)
  • Year and Date: 2011-03-22
• [Presentation] 予ひずみ付与によるフェライト・マルテンサイト層状組織高の微視的残留応力・ひずみ状態の変化の計測 (2009)
  • Author(s): 稲生明弘, 三上欣希, 島貫広志, 望月正人
  • Organizer: 溶接構造シンポジウム2009
  • Place of Presentation: 吹田市(大阪府)
  • Year and Date: 2009-11-18
• [Presentation] フェライト・マルテンサイト層状組織鋼における微視的残留応力・ひずみ状態の実験的推定手法に関する検討 (2009)
  • Author(s): 稲生明弘, 三上欣希, 島貫広志, 望月正人
  • Organizer: 溶接学会平成21年度秋季全国大会
  • Place of Presentation: 徳島市(徳島県)
  • Year and Date: 2009-09-11
• [Presentation] 予ひずみ付与によるフェライト・マルテンサイト層状組織鋼の微視的残留応力・ひずみ状態の計測 (2009)
  • Author(s): 稲生明弘, 三上欣希, 島貫広志, 望月正人
  • Organizer: 溶接構造シンポジウム2009講演論文集,溶接学会溶接構造研究委員会,425-428
  • Place of Presentation: 大阪
• [Presentation] Transformation-Induced Microscopic Residual Stress in Ferrite-martensite Lamellar Steels and Its Influence on Fatigue Crack Propagation Paths (2009)
  • Author(s): Y.Mikami, A.Inao, M.Mochiuki, K.Nakashima, H.Shimanuki
  • Organizer: 19th International Offshore and Polar Engineering Conference (ISOPE2009), ISOPE2009-TPC-550
  • Place of Presentation: Osaka, Japan
• [Presentation] フェライト・マルテンサイト層状組織鋼における微視的残留応力・ひずみ状態の実験的推定手法に関する検討 (2009)
  • Author(s): 稲生明弘, 三上欣希, 島貫広志, 望月正人
  • Organizer: 平成21年度溶接学会秋季全国大会
  • Place of Presentation: 徳島