Title:
METHOD, DEVICE, AND PROGRAM FOR PREDICTING DELAYED FRACTURE IN PRESS-FORMED ARTICLE, AND METHOD FOR MANUFACTURING PRESS-FORMED ARTICLE
Document Type and Number:
WIPO Patent Application WO/2023/181539
Kind Code:
A1
Abstract:
The method for predicting delayed fracture in a press-formed article pertaining to the present invention includes: a step (S1) for calculating a stress distribution and a strain distribution of a press-formed article; a step (S5) for setting a hydrogen concentration distribution corresponding to the strain distribution calculated for the press-formed article on the basis of an expression relating strain and hydrogen concentration that is acquired in advance for a high-tensile steel plate; a step (S7) for performing a hydrogen diffusion analysis for the press-formed article on the basis of the stress distribution and the hydrogen concentration distribution and calculating a hydrogen concentration distribution after hydrogen diffusion; and a step (S9) for predicting a site of occurrence of delayed fracture in the press-formed article on the basis of a delayed fracture determination condition based on the stress, strain, and hydrogen concentration acquired in advance, and the stress distribution, the strain distribution, and the hydrogen concentration distribution after hydrogen diffusion.
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Inventors:
TATSUKAWA KOJI (JP)
MINOTE TORU (JP)
ISHIWATARI AKINOBU (JP)
MINOTE TORU (JP)
ISHIWATARI AKINOBU (JP)
Application Number:
PCT/JP2022/046835
Publication Date:
September 28, 2023
Filing Date:
December 20, 2022
Export Citation:
Assignee:
JFE STEEL CORP (JP)
International Classes:
G01N3/28; B21D22/00; G01N3/08; G01N17/00
Foreign References:
| JP2011033600A | 2011-02-17 | |||
| JP2017187441A | 2017-10-12 | |||
| JP2006029977A | 2006-02-02 | |||
| JP2013127104A | 2013-06-27 | |||
| KR20210120704A | 2021-10-07 | |||
| JP7140302B1 | 2022-09-21 |
Attorney, Agent or Firm:
SAKAI INTERNATIONAL PATENT OFFICE (JP)
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