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Maintenance of fatigue damaged friction stir welding joints by laser peening and integrity evaluation with synchrotron radiation laminography

Research Project

Project/Area Number 16K06761
Research Category

Grant-in-Aid for Scientific Research (C)

Allocation TypeMulti-year Fund
Section一般
Research Field Composite materials/Surface and interface engineering
Research InstitutionOkinawa National College of Technology

Principal Investigator

MASAKI Kiyotaka  沖縄工業高等専門学校, 機械システム工学科, 准教授 (30323885)

Research Collaborator SANO yuji  
SANO tomokazu  
KAJIWARA kentarou  
OMAR Hatamleh  
Project Period (FY) 2016-04-01 – 2019-03-31
Project Status Completed (Fiscal Year 2018)
Budget Amount *help
¥4,810,000 (Direct Cost: ¥3,700,000、Indirect Cost: ¥1,110,000)
Fiscal Year 2018: ¥1,300,000 (Direct Cost: ¥1,000,000、Indirect Cost: ¥300,000)
Fiscal Year 2017: ¥1,690,000 (Direct Cost: ¥1,300,000、Indirect Cost: ¥390,000)
Fiscal Year 2016: ¥1,820,000 (Direct Cost: ¥1,400,000、Indirect Cost: ¥420,000)
Keywords摩擦攪拌接合 / 疲労き裂進展 / 放射光ラミノグラフィ / レーザピーニング / 応力拡大係数 / 残留応力 / ショットピーニング / 機械材料・材料力学 / 構造・機能材料 / 材料加工・処理 / 長寿命化
Outline of Final Research Achievements

In this study, in order to ensure integrity of fatigue damaged friction stir welded (FSW) joints of 3mm thickness which has a fatigue crack at center part of welding center, two types of laser peening treatment are applied at the tip of the fatigue crack. One is conventional LPwC treatment treated in water and the other one is newly developed Dry-LP treatment treated in atmosphere. When the Dry-LP was applied, crack growth was almost suppressed including the inside of the specimen. However, when the LPwC was applied, fatigue crack propagate about 1 mm during 2.0x104 cycles and its fatigue crack propagation rate had accelerated. This study suggested that Dry-LP is suitable for FSWed thin plate. In addition, as a result of simultaneously visualizing the stirred structure formed by FSW process and the fatigue crack using synchrotron radiation laminography, it became clear that the fatigue crack propagates in the boundary portion of the stirred structure and the base material.

Academic Significance and Societal Importance of the Research Achievements

本研究では、摩擦攪拌(FSW)継手材を対象として、放射光ラミノグラフィを利用した疲労き裂と摩擦攪拌組織の同時可視化をおこない、世界で初めてFSW継手材に発生した疲労き裂進展状況と摩擦攪拌組織を可視化した。この成果は、FSW継手のき裂発生・進展メカニズム解明に大きく貢献するものである。さらに、疲労損傷を受けたFSW継手材にレーザピーニング(LP)処理を施し、特にDry-LP処理によって疲労き裂の成長を停止させた成果は、航空機などの薄板構造物の安全性を確保することにつながり、社会的に大きな意義を持つものである。

Report

(4 results)
  • 2018 Annual Research Report   Final Research Report ( PDF )
  • 2017 Research-status Report
  • 2016 Research-status Report
  • Research Products

    (16 results)

All 2018 2017 2016 Other

All Journal Article (2 results) (of which Peer Reviewed: 2 results,  Open Access: 1 results) Presentation (12 results) (of which Int'l Joint Research: 7 results) Remarks (2 results)

  • [Journal Article] FEMTOSECOND LASER PEENING OF FRICTION STIR WELDED 7075-T73 ALUMINUM ALLOYS2018

    • Author(s)
      Terumasa Kawashima, Tomokazu Sano, Akio Hirose, Seiichiro Tsutsumi, Kiyotaka Masaki, Kazuto Arakawa, ans Hisashi Horie
    • Journal Title

      Journal of Materials Processing Technology

      Volume: 262 Pages: 111-122

    • NAID

      130006259269

    • Related Report
      2018 Annual Research Report
    • Peer Reviewed
  • [Journal Article] FEMTOSECOND LASER PEENING OF 2024 ALUMINUM ALLOY WITHOUT A SACRIFICIAL OVERLAY UNDER ATMOSPHERIC CONDITIONS2017

    • Author(s)
      Tomokazu Sano, Takayuki Eimura, Ryota Kashiwabara, Tomoki Matsuda, Yutaro Isshiki, Akio Hirose, Seiichiro Tsutsumi, Kazuto Arakawa, Tadafumi Hashimoto, Kiyotaka Masaki, and Yuji Sano
    • Journal Title

      Journal of Laser Applications

      Volume: 29 Issue: 1 Pages: 1-7

    • DOI

      10.2351/1.4967013

    • NAID

      120006352342

    • Related Report
      2016 Research-status Report
    • Peer Reviewed / Open Access
  • [Presentation] EFFECT OF FEMTO/NANO LASER PEENING ON PLANE BENDING FATIGUE PROPERTY OF FRICTION STIR WELDED A20242018

    • Author(s)
      K. MASAKI Y. SANO and T. SANO
    • Organizer
      the 7th International Conference on Laser Peening and Related Phenomena
    • Related Report
      2018 Annual Research Report
    • Int'l Joint Research
  • [Presentation] DRY LASER PEENING: FEMTOSECOND LASER PEENING WITHOUT A SACRIFICIAL OVERLAY UNDER ATMOSPHERIC CONDITIONS2018

    • Author(s)
      T. SANO, T. EIMURA, A. HIROSE, S. TSUTSUMI, K. ARAKAWA, A. SHIRO, T. SHOBU, K. MASAKI and Y. SANO
    • Organizer
      the 7th International Conference on Laser Peening and Related Phenomena
    • Related Report
      2018 Annual Research Report
    • Int'l Joint Research
  • [Presentation] INVESTIGATION OF MATERIAL PROPERTIES OF FEMTOSECOND LASER-PEENED 2024 ALUMINUM ALLOY WITHOUT COATING AND PLASMA CONFINEMENT MEDIUM2018

    • Author(s)
      M KASUGA, T. SANO, T. EIMURA, A. HIROSE, S. TSUTSUMI, K. MASAKI and Y. SANO
    • Organizer
      the 7th International Conference on Laser Peening and Related Phenomena
    • Related Report
      2018 Annual Research Report
    • Int'l Joint Research
  • [Presentation] EFFECT OF FEMTO/NANO-SECOND LASER PEENING ON PLANE BENDING FATIGUE PROPERTY OF FRICTION STIR WELDED A20242018

    • Author(s)
      K. MASAKI Y. SANO and T. SANO
    • Organizer
      the 12th International Fatigue Congress
    • Related Report
      2018 Annual Research Report
    • Int'l Joint Research
  • [Presentation] A2024/A6061異材FSW継手材の疲労特性におよぼすレーザピーニングの影響2017

    • Author(s)
      政木清孝,木村聖光,佐野雄二,佐野智一
    • Organizer
      日本材料学会 第66期学術講演会
    • Related Report
      2017 Research-status Report
  • [Presentation] レーザピーニング処理によるA2024 共材FSW継手の平面曲げ疲労特性改善2017

    • Author(s)
      政木清孝,佐野雄二,佐野智一
    • Organizer
      日本機械学会 2017年度 年次大会
    • Related Report
      2017 Research-status Report
  • [Presentation] A2024共材FSW継手の平面曲げ疲労特性におよぼすフェムト秒/ナノ秒レーザピーニング処理の影響2017

    • Author(s)
      政木清孝,佐野雄二,佐野智一
    • Organizer
      日本機械学会M&M2017材料力学カンファレンス
    • Related Report
      2017 Research-status Report
  • [Presentation] レーザピーニング処理したA2024共材FSW継手の平面曲げ疲労特性2017

    • Author(s)
      政木清孝,佐野 雄二,佐野智一
    • Organizer
      日本材料学会 高温強度・破壊力学合同シンポジウム
    • Related Report
      2017 Research-status Report
  • [Presentation] EFFECTS OF LASER PEENING ON PLANE BENDING FATIGUE PROPERTIES OF DISSIMILAR FRICTION STIR WELDED ALUMINUM JOINTS2016

    • Author(s)
      K. MASAKI Y. SANO and T. SANO
    • Organizer
      The 6th International Conference on Laser Peening and Related Phenomena
    • Place of Presentation
      South AFRICA
    • Year and Date
      2016-11-08
    • Related Report
      2016 Research-status Report
    • Int'l Joint Research
  • [Presentation] フェムト秒レーザピーニング処理によるA2024 共材FSW 継手の平面曲げ疲労特性改善2016

    • Author(s)
      政木清孝,佐野雄二,佐野智一
    • Organizer
      日本機械学会 材料力学部門カンファレンス(M&M'16)
    • Place of Presentation
      兵庫県 神戸大学
    • Year and Date
      2016-10-08
    • Related Report
      2016 Research-status Report
    • Int'l Joint Research
  • [Presentation] IMPROVEMENT OF FATIGUE PROPERTIES OF 2024-T3 ALUMINUM ALLOY USING FEMTOSECOND LASER-PEENING2016

    • Author(s)
      T. EIMURA, T. SANO, A. HIROSE, S. TSUTSUMI, K. MASAKI, K. ARAKAWA and Y. SANO
    • Organizer
      9th Pacific Rim International Conference on Advanced Materials and Processing
    • Place of Presentation
      京都府 京都国際会議場
    • Year and Date
      2016-08-16
    • Related Report
      2016 Research-status Report
    • Int'l Joint Research
  • [Presentation] 摩擦攪拌接合継手への適用を目指したアルミニウム合金7075のフェムト秒レーザピーニング2016

    • Author(s)
      川嶋光将,佐野智一,廣瀬明夫,堤成一郎,政木清孝,堀久司
    • Organizer
      一般社団法人レーザ加工学会 第85回レーザ加工学会講演会
    • Place of Presentation
      大阪府 大阪大学
    • Year and Date
      2016-06-09
    • Related Report
      2016 Research-status Report
  • [Remarks] https://www.researchgate.net/

    • URL

      https://www.researchgate.net/profile/Kiyotaka_Masaki

    • Related Report
      2017 Research-status Report
  • [Remarks] researchgate.net

    • URL

      https://www.researchgate.net/profile/Kiyotaka_Masaki

    • Related Report
      2016 Research-status Report

URL: 

Published: 2016-04-21   Modified: 2020-03-30  

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