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Development of estimation method for temperature and strain rate dependencies via ball impact test

Research Project

Project/Area Number 19K14846
Research Category

Grant-in-Aid for Early-Career Scientists

Allocation TypeMulti-year Fund
Review Section Basic Section 18010:Mechanics of materials and materials-related
Research InstitutionTokyo University of Science

Principal Investigator

Ito Kiyohiro  東京理科大学, 工学部機械工学科, 助教 (10778210)

Project Period (FY) 2019-04-01 – 2021-03-31
Project Status Completed (Fiscal Year 2020)
Budget Amount *help
¥4,160,000 (Direct Cost: ¥3,200,000、Indirect Cost: ¥960,000)
Fiscal Year 2020: ¥1,300,000 (Direct Cost: ¥1,000,000、Indirect Cost: ¥300,000)
Fiscal Year 2019: ¥2,860,000 (Direct Cost: ¥2,200,000、Indirect Cost: ¥660,000)
Keywordsひずみ速度依存性 / 温度依存性 / 球体衝突 / 金属材料 / 圧痕 / 材料定数 / 球体高速衝突試験 / 高速衝突 / 材料特性 / 構成式
Outline of Research at the Start

本研究では,材料のひずみ速度と温度依存性を考慮した構成式の材料定数について,球体衝突試験によって簡易的に評価する手法を確立することを目的とする.そのために,球体衝突により基材に生じる圧痕直径を高精度に予測可能な理論モデルの構築,ならびに高温環境下球体衝突試験装置の開発を行う.本手法では,球体衝突試験を行い,基材に生じる圧痕直径を測定するだけで構成式の材料定数が得られる.そのため,自動車や航空機の衝突解析や塑性加工解析を実施している幅広い産業分野への貢献が期待できる.

Outline of Final Research Achievements

The deformation resistance of metallic materials varies depending on the temperature and strain rate. In order to realize simple and high-accuracy estimation of the temperature and strain rate dependencies, an original estimation method based on the ball impact test was developed. Using this method, the temperature and strain rate dependencies can be estimated with high-accuracy from the difference between indentation sizes formed by the ball impact test at different temperatures or different impact velocities. The ball impact analysis based on the finite element method demonstrated that the temperature and strain rate dependencies can be estimated with high-accuracy under the conditions of various materials, ball radii, and impact velocities by the developed method.

Academic Significance and Societal Importance of the Research Achievements

本研究で新たに開発した評価手法では,異なる温度もしくは衝突速度で球体衝突試験を行い,材料表面に形成した圧痕寸法を測定するだけで温度やひずみ速度依存性を高精度に評価することができる.さらに,既存の評価手法では困難であった100000 1/s以上の超高ひずみ速度を実現できる.これにより,自動車などの輸送機器の衝突安全性向上や,切削やプレスといった機械加工の高速・高効率化など,幅広い産業分野への貢献が期待できる.また,超高ひずみ速度下における材料の変形メカニズムの解明にも有効となり得ることが期待でき,高い学術的意義も有している.

Report

(3 results)
  • 2020 Annual Research Report   Final Research Report ( PDF )
  • 2019 Research-status Report
  • Research Products

    (7 results)

All 2021 2020 2019

All Journal Article (5 results) (of which Peer Reviewed: 5 results,  Open Access: 2 results) Presentation (2 results)

  • [Journal Article] 圧痕寸法差に基づく広範囲のひずみ速度下における流動応力の温度依存性推定手法の提案2021

    • Author(s)
      伊藤潔洋, 荒井正行
    • Journal Title

      材料

      Volume: -

    • NAID

      130008090420

    • Related Report
      2020 Annual Research Report
    • Peer Reviewed / Open Access
  • [Journal Article] Simple estimation method for strain rate sensitivity based on the difference between the indentation sizes formed by spherical-shaped impactors2021

    • Author(s)
      Kiyohiro Ito, Masayuki Arai
    • Journal Title

      International Journal of Mechanical Sciences

      Volume: 189 Pages: 106007-106007

    • DOI

      10.1016/j.ijmecsci.2020.106007

    • Related Report
      2020 Annual Research Report
    • Peer Reviewed
  • [Journal Article] Effectiveness of prediction method of indentation size formed by high-velocity impingement of a solid sphere2020

    • Author(s)
      Kiyohiro Ito, Masayuki Arai
    • Journal Title

      AIP Conference Proceedings

      Volume: 2309 Pages: 020047-020047

    • DOI

      10.1063/5.0034344

    • Related Report
      2020 Annual Research Report
    • Peer Reviewed
  • [Journal Article] Development of estimation method of strain rate dependency of materials based on a high-velocity impingement test with a solid sphere2020

    • Author(s)
      伊藤潔洋, 村松寿和, 荒井正行
    • Journal Title

      Transactions of the JSME (in Japanese)

      Volume: 86 Issue: 886 Pages: 20-00060-20-00060

    • DOI

      10.1299/transjsme.20-00060

    • NAID

      130007864422

    • ISSN
      2187-9761
    • Related Report
      2020 Annual Research Report
    • Peer Reviewed / Open Access
  • [Journal Article] Expanding cavity model combined with Johnson-Cook constitutive equation for the dynamic indentation problem2020

    • Author(s)
      Kiyohiro Ito, Masayuki Arai
    • Journal Title

      Journal of Engineering Materials and Technology

      Volume: 142 Issue: 2 Pages: 1-10

    • DOI

      10.1115/1.4045329

    • Related Report
      2019 Research-status Report
    • Peer Reviewed
  • [Presentation] 球体の高速衝突により形成される圧痕寸法予測モデルの有効性2020

    • Author(s)
      伊藤潔洋, 荒井正行
    • Organizer
      日本材料学会第69期学術講演会
    • Related Report
      2019 Research-status Report
  • [Presentation] 球体の高速衝突問題に拡張されたキャビティモデルに基づく圧痕寸法の予測2019

    • Author(s)
      伊藤潔洋, 荒井正行
    • Organizer
      日本機械学会M&M2019材料力学カンファレンス
    • Related Report
      2019 Research-status Report

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Published: 2019-04-18   Modified: 2022-01-27  

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