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Prediction of Development of Inhomogeneous Plastic Deformation and Fracture Based on Change in Elastic Height Distribution in Polycrystalline Metals

Research Project

Project/Area Number 18H01337
Research Category

Grant-in-Aid for Scientific Research (B)

Allocation TypeSingle-year Grants
Section一般
Review Section Basic Section 18010:Mechanics of materials and materials-related
Research InstitutionOkayama University

Principal Investigator

Tada Naoya  岡山大学, 自然科学研究科, 教授 (70243053)

Co-Investigator(Kenkyū-buntansha) 上森 武  岡山大学, 自然科学研究科, 准教授 (70335701)
坂本 惇司  岡山大学, 自然科学研究科, 助教 (50752052)
Project Period (FY) 2018-04-01 – 2021-03-31
Project Status Completed (Fiscal Year 2020)
Budget Amount *help
¥17,940,000 (Direct Cost: ¥13,800,000、Indirect Cost: ¥4,140,000)
Fiscal Year 2020: ¥1,430,000 (Direct Cost: ¥1,100,000、Indirect Cost: ¥330,000)
Fiscal Year 2019: ¥3,510,000 (Direct Cost: ¥2,700,000、Indirect Cost: ¥810,000)
Fiscal Year 2018: ¥13,000,000 (Direct Cost: ¥10,000,000、Indirect Cost: ¥3,000,000)
Keywords弾性不均一変形 / 塑性不均一変形 / 表面高度分布 / 多結晶金属材料 / 表面あれ
Outline of Final Research Achievements

Tensile tests were carried out using plate and thin sheet specimens of polycrystalline pure titanium. Microscopic inhomogeneous deformations under elastic and plastic conditions were discussed focusing on the deformation of thin sheet specimens where the effect of interior crystal grains was week. The following resutls were obtained. Height changes at the center of grains were correlated with those near the grain boundaries. Correlation between the height changes on the front and back surfaces changed when the deformation changed from elastic to plastic. The initiation of slip lines near the notch could be predicted by slip activity.

Academic Significance and Societal Importance of the Research Achievements

本研究では純チタンの微視的不均一変形を変形初期に相当する弾性状態から塑性状態まで詳細に観察・測定し,弾性不均一変形と塑性不均一変形の関係等を明らかにした.本材料では,塑性不均一変形が主としてすべりによって生じるが,切欠き材のような応力集中部が存在する場合を含め,すべり線の発生を予測する手法を提案した.すべりの発生予測や弾性不均一変形と塑性不均一変形の関係は,材料の破壊と深く関連するため,各種構造材料の破壊防止に有用であると考える.

Report

(4 results)
  • 2020 Annual Research Report   Final Research Report ( PDF )
  • 2019 Annual Research Report
  • 2018 Annual Research Report

Research Products

(14 results)

All 2021 2020 2019 2018

All Journal Article (5 results) (of which Peer Reviewed: 5 results,  Open Access: 4 results) Presentation (9 results) (of which Int'l Joint Research: 3 results)

  • [Journal Article] Prediction of the Fracture Location by Tensile Tests of Gray Cast Iron Based on the Dimensional Changes of Graphite Flakes2021

    • Author(s)
      Naoya Tada, Takeshi Uemori, Junji Sakamoto
    • Journal Title

      Transactions of the ASME, Journal of Pressure Vessel Technology

      Volume: 143 Pages: 1-8

    • DOI

      10.1115/1.4048063

    • NAID

      120007161126

    • Related Report
      2020 Annual Research Report
    • Peer Reviewed
  • [Journal Article] Finite Element Study of the Effect of Internal Crack on Surface Profile Change due to Low Loading of Turbine Blade2020

    • Author(s)
      Junji Sakamoto, Naoya Tada, Takeshi Uemori, Hayato Kuniyasu
    • Journal Title

      Applied Sciences

      Volume: 10 Pages: 1-14

    • DOI

      10.3390/app10144883

    • NAID

      120006877907

    • Related Report
      2020 Annual Research Report
    • Peer Reviewed / Open Access
  • [Journal Article] Analysis of the change of direct current potential difference and diameter distribution of thin pure titanium wire subjected to tensile and fatigue loads for fracture prediction2020

    • Author(s)
      坂本惇司,高木佑輔,上森武,多田直哉
    • Journal Title

      Transactions of the JSME (in Japanese)

      Volume: 86 Issue: 882 Pages: 19-00351-19-00351

    • DOI

      10.1299/transjsme.19-00351

    • NAID

      130007801826

    • ISSN
      2187-9761
    • Related Report
      2019 Annual Research Report
    • Peer Reviewed / Open Access
  • [Journal Article] Crystal Plasticity Finite Element Analysis of Effects of Microscopic Non-Uniform Deformation on Surface Roughness of Pure Titanium Sheet2019

    • Author(s)
      上森武,柿原大毅,多田直哉
    • Journal Title

      J. Soc. Mat. Sci., Japan

      Volume: 68 Issue: 6 Pages: 478-484

    • DOI

      10.2472/jsms.68.478

    • NAID

      130007665157

    • ISSN
      0514-5163, 1880-7488
    • Related Report
      2019 Annual Research Report
    • Peer Reviewed / Open Access
  • [Journal Article] Microscopic Elastic and Plastic Inhomogeneous Deformations and Height Changes on the Surface of a Polycrystalline Pure-Titanium Plate Specimen under Cyclic Tension2018

    • Author(s)
      Naoya Tada, Takeshi Uemori
    • Journal Title

      Applied Sciences

      Volume: 8 Pages: 1-16

    • DOI

      10.3390/app8101907

    • Related Report
      2018 Annual Research Report
    • Peer Reviewed / Open Access
  • [Presentation] 切欠きを有する純チタン薄膜試験片の引張に伴う結晶粒のすべり変形挙動に関する検2021

    • Author(s)
      石田諭史,多田直哉,上森武,坂本惇司,石丸恵太
    • Organizer
      日本機械学会中国四国支部第59期総会・講演会
    • Related Report
      2020 Annual Research Report
  • [Presentation] Microscopic Deformation of Thin Sheet of Polycrystalline Pure Titanium Under Tension2020

    • Author(s)
      Naoya TADA, Kentaro KISHIMOTO, Takeshi Uemori, Junji Sakamoto
    • Organizer
      ASME 2020 Pressure Vessels and Piping Conference (PVP2020)
    • Related Report
      2020 Annual Research Report
    • Int'l Joint Research
  • [Presentation] 多結晶純チタンの繰返し引張後の微視的残留応力とすべり線の関係2020

    • Author(s)
      松本大樹,多田直哉,上森武,坂本惇司
    • Organizer
      日本材料学会第6回材料WEEK材料シンポジウム
    • Related Report
      2020 Annual Research Report
  • [Presentation] Slip Deformation of Crystal Grains in Semi-Circular Notched Thin Sheet Specimen of Pure Titanium during Tensile Test2019

    • Author(s)
      Takashi Ishida, Naoya Tada, Takeshi Uemori, Junji Sakamoto
    • Organizer
      International Conference on Advanced Technology in Experimental Mechanics 2019 (ATEM ‘19)
    • Related Report
      2019 Annual Research Report
    • Int'l Joint Research
  • [Presentation] 低荷重負荷による表面性状変化を用いた内在欠陥の検出2019

    • Author(s)
      坂本惇司,國安隼人,多田直哉,上森武
    • Organizer
      日本機械学会材料力学部門M&M若手シンポジウム2019
    • Related Report
      2019 Annual Research Report
  • [Presentation] 純チタン薄膜の引張変形に伴う表面と裏面の微視的高度分布の関係2019

    • Author(s)
      岸本健太郎,多田直哉,上森武,坂本惇司
    • Organizer
      日本材料学会第5回材料WEEK材料シンポジウム
    • Related Report
      2019 Annual Research Report
  • [Presentation] 多結晶純チタンの引張りにおける結晶方位変化を考慮に入れた微視的すべり変形の評価2019

    • Author(s)
      佐藤宏樹,多田直哉,上森武,坂本惇司
    • Organizer
      日本金属学会2019年春期(第164回)講演大会
    • Related Report
      2018 Annual Research Report
  • [Presentation] Numerical Investigation of Relation between Surface Roughness and Microscopic Interior Deformation in Polycrystalline Pure Titanium Sheet2018

    • Author(s)
      Takeshi Uemori, Naoya Tada
    • Organizer
      Asia-Pacific Conference on Fracture and Strength 2018
    • Related Report
      2018 Annual Research Report
    • Int'l Joint Research
  • [Presentation] 純チタン細線の引張試験における変形と直流電位差の関係2018

    • Author(s)
      高木佑輔,多田直哉,上森武
    • Organizer
      日本機械学会2018年度年次大会
    • Related Report
      2018 Annual Research Report

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Published: 2018-04-23   Modified: 2022-01-27  

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