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Proposing of damage assessment method of seismic-loaded structural material based on surface roughness measurement

Research Project

Project/Area Number 26889001
Research Category

Grant-in-Aid for Research Activity Start-up

Allocation TypeSingle-year Grants
Research Field Materials/Mechanics of materials
Research InstitutionHokkaido University

Principal Investigator

FUJIMURA NAO  北海道大学, 工学(系)研究科(研究院), 助教 (40732988)

Project Period (FY) 2014-08-29 – 2016-03-31
Project Status Completed (Fiscal Year 2015)
Budget Amount *help
¥2,730,000 (Direct Cost: ¥2,100,000、Indirect Cost: ¥630,000)
Fiscal Year 2015: ¥1,300,000 (Direct Cost: ¥1,000,000、Indirect Cost: ¥300,000)
Fiscal Year 2014: ¥1,430,000 (Direct Cost: ¥1,100,000、Indirect Cost: ¥330,000)
Keywords疲労損傷評価 / 表面粗さ / ステンレス鋼
Outline of Final Research Achievements

In order to evaluate seismic-loaded damage based on the changes in surface roughness of material due to cyclic deformation, the effects of strain rate on the fatigue life and the changes in surface roughness of austenitic stainless steel was investigated. Low cycle fatigue tests were conducted under strain rate: 4%/sec, and the fatigue lives were compared with the fatigue lives obtained under 0.4%/sec. As a result, the fatigue lives at 4%/sec and 0.4%/sec were nearly equal. This shows that the tenfold increase in strain rate do not affect low cycle fatigue life. During the fatigue tests, specimen’s surface roughness was regularly measured using a laser scanning microscope. Surface roughness measurement showed that the changes in surface roughness at 4%/sec were little different from that at 0.4%/sec. Based on these results, the damage assessment method on the basis of surface roughness was discussed.

Report

(3 results)
  • 2015 Annual Research Report   Final Research Report ( PDF )
  • 2014 Annual Research Report
  • Research Products

    (3 results)

All 2016 2015

All Presentation (3 results)

  • [Presentation] SUS316NGの低サイクル疲労寿命と表面性状の変化に及ぼすひずみ速度の影響2016

    • Author(s)
      上遠野寛,中村孝,藤村奈央,中田康敬,西塚祐斗
    • Organizer
      日本機械学会 北海道学生会 第45回学生員卒業研究発表講演会
    • Place of Presentation
      函館工業高等専門学校(函館市)
    • Year and Date
      2016-03-07
    • Related Report
      2015 Annual Research Report
  • [Presentation] 低サイクル疲労損傷を受けたSUS316NGにおける表面粗さの分布2015

    • Author(s)
      藤村奈央,中村孝,信耕友樹
    • Organizer
      日本機械学会 M&M2015材料力学カンファレンス
    • Place of Presentation
      慶應義塾大学矢上キャンパス(横浜市)
    • Year and Date
      2015-11-21
    • Related Report
      2015 Annual Research Report
  • [Presentation] SUS316NGの低サイクル疲労における表面凹凸の変化とその形成機構2015

    • Author(s)
      西塚祐斗,中村孝,藤村奈央,信耕友樹,中田康敬
    • Organizer
      日本機械学会北海道学生会第44回学生員卒業研究発表講演会
    • Place of Presentation
      北海道科学大学(北海道)
    • Year and Date
      2015-03-07
    • Related Report
      2014 Annual Research Report

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Published: 2014-09-09   Modified: 2017-05-10  

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