Time and flow stress dependences of internal stress during stress relaxation

Yoshinori Kusuda, Kodai Murasawa, Yurina Suzuki, Shinsuke Suzuki, Masato Takamura, Tomoyuki Hakoyama, Yoshimasa Ikeda, Yoshie Otake, Takayuki Hama

Research output: Contribution to journalConference article

Abstract

Stress relaxation is a potential cause of formability improvement. To describe stress relaxation, the measurement of internal stress is essential. We investigated the time and flow stress dependences of the internal stress by conducting a strain-rate-change test and stress-dip test. The comparison between the two tests revealed that the internal stress decreases as the stress relaxation progresses over time. Moreover, the internal stress decreases as the flow stress decreases. We propose that the time dependence of the internal stress could have been caused by the flow stress dependence of the internal stress because the flow stress-internal stress and the initial stress-internal stress relationships are approximately identical.

Original languageEnglish
Pages (from-to)1746-1753
Number of pages8
JournalProcedia Manufacturing
Volume15
DOIs
Publication statusPublished - 2018 Jan 1
Event17th International Conference on Metal Forming, METAL FORMING 2018 - Toyohashi, Japan
Duration: 2018 Sep 162018 Sep 19

Keywords

  • Dynamic recovery
  • High tensile strength steel
  • Internal stress
  • Strain rate dependence of flow stress
  • Strain-rate-change test
  • Stress relaxation
  • Stress-dip test
  • Thermal activated processs
  • Work hardening

ASJC Scopus subject areas

  • Industrial and Manufacturing Engineering
  • Artificial Intelligence

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  • Cite this

    Kusuda, Y., Murasawa, K., Suzuki, Y., Suzuki, S., Takamura, M., Hakoyama, T., Ikeda, Y., Otake, Y., & Hama, T. (2018). Time and flow stress dependences of internal stress during stress relaxation. Procedia Manufacturing, 15, 1746-1753. https://doi.org/10.1016/j.promfg.2018.07.250