Improving Fatigue Strength of Welded Joints by Laser Peening

• Project/Area Number: 21360214
• Research Category: Grant-in-Aid for Scientific Research (B)
• Allocation Type: Single-year Grants
• Section: 一般
• Research Field: Structural engineering/Earthquake engineering/Maintenance management engineering
• Research Institution: Osaka University
• Principal Investigator: SAKINO Yoshihiro 大阪大学, 接合科学研究所, 講師 (80273712)
• Project Period (FY): 2009 – 2011
• Project Status: Completed (Fiscal Year 2011)
• Budget Amount: ¥18,200,000 (Direct Cost: ¥14,000,000、Indirect Cost: ¥4,200,000); Fiscal Year 2011: ¥2,990,000 (Direct Cost: ¥2,300,000、Indirect Cost: ¥690,000); Fiscal Year 2010: ¥3,900,000 (Direct Cost: ¥3,000,000、Indirect Cost: ¥900,000); Fiscal Year 2009: ¥11,310,000 (Direct Cost: ¥8,700,000、Indirect Cost: ¥2,610,000)
• Keywords: レーザピーニング / 溶接 / 疲労 / 残留応力 / 大型試験体

Research Abstract

Nozzle-type laser peening unit, which can apply to welding joints of large steel structures, was developed in this study. Then, it was elucidated by residual stress measurement that large and deep compressive residual stress was also generated by nozzle-type laser peening. Moreover, improving fatigue strength of welded joints after laser peening was ascertained by conducting fatigue tests using large specimens.

Research Products

• [Journal Article] Application of Laser Peening without Coating onSteel Welded Joints (2011)
  • Author(s): Yoshihiro SAKINO, Yuji SANO and You-Chul KIM
  • Journal Title: International Journal of Structural Integrity Volume: Vol.2, No.3 Pages: 332-344
  • URL: http://www.emeraldinsight.com/1757-9864.htm
  • Peer Reviewed
• [Journal Article] レーザピーニングの各種構造用鋼への適用に関する基礎的検討 (2011)
  • Author(s): 崎野良比呂, 佐野雄二, 金裕哲
  • Journal Title: 鋼構造論文集 Volume: Vol.18, No.69 Pages: 61-70
  • NAID: 130004955766
  • Peer Reviewed
• [Presentation] レーザピーニングによる溶接継手の疲労強度向上-社会資本ストックのメンテナンスに向けて- (2013)
  • Author(s): 崎野 良比呂
  • Organizer: レーザー学会 レーザー衝撃科学の基礎と応用専門委員会
  • Place of Presentation: 科学技術交流財団シンクロトロン光センター(愛知県)
  • Year and Date: 2013-03-11
• [Presentation] レーザピーニングの大型構造物への適用 (2013)
  • Author(s): 崎野 良比呂
  • Organizer: 溶接学会 溶接構造研究委員会
  • Place of Presentation: 大阪大学中之島センター(大阪府)
  • Year and Date: 2013-01-16
• [Presentation] 大型溶接試験体におけるレーザピーニングの疲労寿命向上効果 (2012)
  • Author(s): 崎野 良比呂
  • Organizer: 平成24年度溶接学会秋季全国大会
  • Place of Presentation: 奈良商工会議所(奈良県)
  • Year and Date: 2012-09-27
• [Presentation] Application of LPwC to High-Strength Structural Steel and Its Weld Zone (2011)
  • Author(s): Yoshihiro SAKINO
  • Organizer: 3nd International Conference on Laser Peening and Related Phenomena
  • Place of Presentation: Osaka, Japan
  • Year and Date: 2011-11-12
• [Presentation] Application of laser peening to fatigue of steel bridges (2010)
  • Author(s): Yoshihiro SAKINO
  • Organizer: 2nd International Conference on Laser Peening and Related Phenomena
  • Place of Presentation: San Francisco, USA
  • Year and Date: 2010-04-19
• [Presentation] Application of laser peening to fatigue of steel bridges (2010)
  • Author(s): 崎野良比呂
  • Organizer: The 2nd International Conference on Laser Peening
  • Place of Presentation: サンフランシスコ(米国)
  • Year and Date: 2010-04-19
• [Presentation] Application of laser peening to fatigue of steel bridges (2010)
  • Author(s): 崎野 良比呂
  • Organizer: The 2nd International Conference on Laser Peening
  • Place of Presentation: サンフランシスコ
  • Year and Date: 2010-04-19