Title:
METHOD FOR ESTIMATING STRESS-STRAIN RELATIONSHIP
Document Type and Number:
WIPO Patent Application WO/2020/170496
Kind Code:
A1
Abstract:
The method for estimating a stress-strain relationship according to the present invention includes: a tensile load-strain distribution acquisition step S1 for causing a tensile load to act on a tension test specimen (1) until a strain zone is reached in which uniform elongation is exceeded, and acquiring the tensile load and a strain distribution; a stress-strain relationship acquisition step S3 for acquiring a relationship between stress and strain that applies up to uniform elongation of the tension test specimen (1); a material constant identification step S5 for identifying a material constant of two hardening rules; a tensile load rough-calculation step S7 for using the strain distribution in the strain zone in which uniform elongation is exceeded, and a corresponding stress derived according to a mixing rule that complements the two hardening rules using a weighted coefficient, to roughly calculate the tensile load acting on the tension test specimen (1); and a weighted coefficient determination step S9 for determining the value of the weighted coefficient so that the roughly calculated tensile load and the acquired tensile load coincide.
Inventors:
SUMIKAWA SATOSHI (JP)
Application Number:
PCT/JP2019/040069
Publication Date:
August 27, 2020
Filing Date:
October 10, 2019
Export Citation:
Assignee:
JFE STEEL CORP (JP)
International Classes:
G01N3/08
Foreign References:
| JP2011022125A | 2011-02-03 | |||
| JP2012104042A | 2012-05-31 |
Other References:
KANBARA, DAISUKE ET ET AL.: "Determination of stress-strain curves at large strain of sheet metals", THE PROCEEDINGS OF CONFERENCE OF CHUGOKU-SHIKOKU BRANCH, vol. 52, 2014, Retrieved from the Internet
CAPILLA, G. ET AL.: "Determination of uniaxial large-strain workhardening of high-strength steel sheets from in-plane stretch-bending testing", JOURNAL OF MATERIALS PROCESSING TECHNOLOGY, vol. 243, 8 December 2016 (2016-12-08), pages 152 - 169, XP029913610, Retrieved from the Internet [retrieved on 20191216], DOI: 10.1016/j.jmatprotec.2016.12.002
CAPILLA, G. ET AL.: "Determination of uniaxial large-strain workhardening of high-strength steel sheets from in-plane stretch-bending testing", JOURNAL OF MATERIALS PROCESSING TECHNOLOGY, vol. 243, 8 December 2016 (2016-12-08), pages 152 - 169, XP029913610, Retrieved from the Internet
Attorney, Agent or Firm:
SAKAI INTERNATIONAL PATENT OFFICE (JP)
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