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Prediction of ductile crack growth and initiation of brittle fracture from weld defects - Quality control criterion of the welded connection

Research Project

Project/Area Number 25420600
Research Category

Grant-in-Aid for Scientific Research (C)

Allocation TypeMulti-year Fund
Section一般
Research Field Building structures/Materials
Research InstitutionSojo University

Principal Investigator

AZUMA Koji  崇城大学, 工学部, 教授 (80320414)

Co-Investigator(Kenkyū-buntansha) IWASHITA Tsutomu  有明工業高等専門学校, 建築学科, 准教授 (10332090)
Project Period (FY) 2013-04-01 – 2016-03-31
Project Status Completed (Fiscal Year 2015)
Budget Amount *help
¥5,070,000 (Direct Cost: ¥3,900,000、Indirect Cost: ¥1,170,000)
Fiscal Year 2015: ¥1,820,000 (Direct Cost: ¥1,400,000、Indirect Cost: ¥420,000)
Fiscal Year 2014: ¥1,430,000 (Direct Cost: ¥1,100,000、Indirect Cost: ¥330,000)
Fiscal Year 2013: ¥1,820,000 (Direct Cost: ¥1,400,000、Indirect Cost: ¥420,000)
Keywords脆性破壊 / 延性き裂 / 溶接欠陥 / 破壊靭性 / 塑性拘束 / 機械切欠き / 有限要素解析 / 破壊評価 / 破壊靱性 / 延性亀裂 / 表面欠陥
Outline of Final Research Achievements

This paper concerns the applicability of the Weibull stress approach for prediction of brittle fracture initiated at the root of welds. Beam-to-diaphragm joint models, which were designed to represent a connection of an I-section beam to RHS column member with through diaphragms, were tested under cyclic loads. Complete joint penetration groove welds were used for the connection between the beam flange and the diaphragm. Specimens had those discontinuities at the roots of welds to the diaphragm, which were created by inserting copper plates into the grooves before welding, or by using wire electrical discharge machining (EDM). Through cracks or surface cracks were installed on both sides of weld terminations.
The prediction of brittle fracture with a variety of defect sizes by using the FE analysis was conducted. The applicability of the Weibull stress approach, comparing it with the applicability of the TSM approach, in predicting brittle fracture from such defects was verified.

Report

(4 results)
  • 2015 Annual Research Report   Final Research Report ( PDF )
  • 2014 Research-status Report
  • 2013 Research-status Report
  • Research Products

    (11 results)

All 2016 2015 2014 Other

All Journal Article (2 results) (of which Peer Reviewed: 2 results,  Acknowledgement Compliant: 1 results) Presentation (9 results) (of which Int'l Joint Research: 3 results)

  • [Journal Article] Prediction of Brittle Fracture from Defects at Groove Face of Complete Joint Penetration Welded Joints2016

    • Author(s)
      Azuma, K., Akahoshi, T., Iwashita, T.
    • Journal Title

      Welding in the World, Int. J. of Materials Joining

      Volume: 60 Issue: 4 Pages: 1-10

    • DOI

      10.1007/s40194-016-0334-8

    • Related Report
      2015 Annual Research Report
    • Peer Reviewed / Acknowledgement Compliant
  • [Journal Article] 異なる深さの疲労き裂あるいは機械切欠きを有する3点曲げ試験片の脆性破壊に関する研究2014

    • Author(s)
      岩下 勉,小林良平,東 康二
    • Journal Title

      鋼構造論文集

      Volume: Vol.21, No.82 Pages: 51-62

    • NAID

      130005095639

    • Related Report
      2014 Research-status Report
    • Peer Reviewed
  • [Presentation] 完全溶込溶接始終端部の欠陥から発生する脆性破壊の予測手法の検討2015

    • Author(s)
      赤星拓哉,東康二,岩下勉
    • Organizer
      日本建築学会
    • Place of Presentation
      東海大学(神奈川県平塚市)
    • Year and Date
      2015-09-04 – 2015-09-06
    • Related Report
      2014 Research-status Report
  • [Presentation] 完全溶込溶接始終端部の欠陥から発生する脆性破壊の予測手法の検討2015

    • Author(s)
      赤星拓哉,東 康二,岩下 勉
    • Organizer
      2015年度日本建築学会大会学術講演会
    • Place of Presentation
      東海大学湘南キャンパス(神奈川県平塚市)
    • Year and Date
      2015-09-04
    • Related Report
      2015 Annual Research Report
  • [Presentation] Prediction of brittle fracture initiating at defects in the end of complete joint penetration groove welds2015

    • Author(s)
      Akahoshi, T., Azuma, K. and Iwashita, T.
    • Organizer
      The International Society of Offshore and Polar Engineers
    • Place of Presentation
      Hawaii (USA)
    • Year and Date
      2015-06-21 – 2015-06-26
    • Related Report
      2014 Research-status Report
  • [Presentation] Prediction of brittle fracture initiating at defects in the end of complete joint penetration groove welds2015

    • Author(s)
      Akahoshi, T., Azuma, K., Iwashita , T.
    • Organizer
      25th International Offshore and Polar Engineering Conference
    • Place of Presentation
      Hawaii, USA
    • Year and Date
      2015-06-21
    • Related Report
      2015 Annual Research Report
    • Int'l Joint Research
  • [Presentation] Application of the Weibull Stress Approach to the Prediction of Brittle Fracture Originating from Defects at the Ends of Groove-Welded Joints2015

    • Author(s)
      Iwashita, T., Azuma, K.
    • Organizer
      15th International Symposium on Tubular Structures
    • Place of Presentation
      Rio de Janeiro, Brazil
    • Year and Date
      2015-05-27
    • Related Report
      2015 Annual Research Report
    • Int'l Joint Research
  • [Presentation] Effects of Cyclic Loading on Occurrence of Brittle Fracture of Notched Specimens2015

    • Author(s)
      Iwashita, T., Azuma, K.
    • Organizer
      15th International Symposium on Tubular Structures
    • Place of Presentation
      Rio de Janeiro, Brazil
    • Year and Date
      2015-05-27
    • Related Report
      2015 Annual Research Report
    • Int'l Joint Research
  • [Presentation] 溶接始終端部の欠陥から進展した延性き裂起点とする脆性破壊の予測2015

    • Author(s)
      赤星拓哉,東康二,岩下勉
    • Organizer
      日本建築学会九州支部
    • Place of Presentation
      熊本県立大学(熊本県熊本市)
    • Year and Date
      2015-03-01
    • Related Report
      2014 Research-status Report
  • [Presentation] Prediction of Brittle Fracture from Defects at Weld Terminations of CJP Groove Welded Joints

    • Author(s)
      K.Azuma
    • Organizer
      International Institute of Welding
    • Place of Presentation
      Essen, Germany
    • Related Report
      2013 Research-status Report
  • [Presentation] Assessment of Brittle Fracture for Single Edge Notched Bend Specimens with Different Machined-Notch Depth

    • Author(s)
      T. Iwashita
    • Organizer
      International Conference on Ocean, Offshore and Arctic Engineering, OMAE
    • Place of Presentation
      Nantes, France
    • Related Report
      2013 Research-status Report

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Published: 2014-07-25   Modified: 2019-07-29  

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