The influence of strain rate and strain on the behavior of stress relaxation in 980 MPa-grade dual phase steel sheets

Kodai Murasawa, Hayato Komine, Yoshie Otake, Hideyuki Sunaga, Masato Takamura, Yoshimasa Ikeda, Shinsuke Suzuki

研究成果: Conference contribution

3 被引用数 (Scopus)

抄録

The specimens (980 MPa-grade dual phase steel sheets) were stretched until the pre-defined strain was obtained. Then the specimens were held at the pre-defined strain and measured the change of stress during holding. We investigated the effects of strain rate and strain at the starting time of holding and whether the stress change during holding could be described by Krempl model. The following results were obtained. First, the stress drop increased with increase of strain rate and the holding time. On the other hand, the stress drop was not affected by strain change at the starting time of holding. Second, initial stress relaxation rate increased with increase of strain rate. However, this strain rate dependency to stress relaxation rate diminished as the holding time became long enough roughly more than 100 s. Third, the stress change during holding obtained by Krempl model accurately agreed with experimental result. It was found that the stress change during holding could be well described by using Krempl model. This suggests that dislocation moves viscously. In addition, the strain rate dependency on stress change during holding could be described by change of the parameter A.

本文言語English
ホスト出版物のタイトルMetal Forming 2016
編集者Danuta Szeliga, Krzysztof Muszka
出版社Trans Tech Publications Ltd
ページ948-953
ページ数6
ISBN(印刷版)9783038357049
DOI
出版ステータスPublished - 2016
イベント16th Metal Forming International Conference, 2016 - Krakow, Poland
継続期間: 2016 9 182016 9 21

出版物シリーズ

名前Key Engineering Materials
716
ISSN(印刷版)1013-9826
ISSN(電子版)1662-9795

Other

Other16th Metal Forming International Conference, 2016
国/地域Poland
CityKrakow
Period16/9/1816/9/21

ASJC Scopus subject areas

  • 材料科学(全般)
  • 材料力学
  • 機械工学

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