Title:
METHOD OF ASSESSING FRACTURES, FRACTURE ASSESSMENT DEVICE, PROGRAM AND COMPUTER READABLE RECORDING MEDIUM
Document Type and Number:
WIPO Patent Application WO/2011/126058
Kind Code:
A1
Abstract:
In a method of assessing fractures in a metal structure, when the portion for fracture assessment has been returned from a plastic state to an elastic state, if the stress when the portion for fracture assessment is returned to the elastic state is defined as (x, y) = (σ2, σ1) (maximum principal stress: σ1, minimum principal stress: σ2) in the (x, y) coordinate plane, the fracture assessment is performed by using a re-yield stress (R) which is determined by the intersection between a straight line that satisfies the relationship y = (σ1 / σ2) x and the yield curve obtained from the plastic state of the portion for fracture assessment. Even when the portion for fracture assessment has been returned from a plastic state to an elastic state, the fracture assessment can be performed with great accuracy.
Inventors:
HIWATASHI SHUNJI (JP)
YONEMURA SHIGERU (JP)
YONEMURA SHIGERU (JP)
Application Number:
PCT/JP2011/058739
Publication Date:
October 13, 2011
Filing Date:
April 06, 2011
Export Citation:
Assignee:
NIPPON STEEL CORP (JP)
HIWATASHI SHUNJI (JP)
YONEMURA SHIGERU (JP)
HIWATASHI SHUNJI (JP)
YONEMURA SHIGERU (JP)
International Classes:
G01N3/00; B21D22/00
Foreign References:
| JP2006155254A | 2006-06-15 | |||
| JP2004042098A | 2004-02-12 | |||
| JP2000312933A | 2000-11-14 | |||
| JP2007152407A | 2007-06-21 | |||
| JP2007232714A | 2007-09-13 | |||
| JP2007232715A | 2007-09-13 | |||
| JP2007285832A | 2007-11-01 |
Other References:
SHIGERU YONEMURA ET AL.: "Forming Limit Prediction and Work-hardening Behavior under Strain-path Changes", JOURNAL OF THE IRON & STEEL INSTITUTE OF JAPAN, vol. 93, no. 4, 1 April 2007 (2007-04-01), pages 317 - 323, XP008169031
SHIGERU YONEMURA ET AL.: "Improvement of Impact Energy Absorption by Using High Strength Steel, Part VIII-Forming Limit Prediction under Strain- path Changes for Automotive High Strength Steels", PREPRINTS OF MEETING ON AUTOMOTIVE ENGINEERS, 23 May 2007 (2007-05-23), pages 1 - 4
See also references of EP 2543983A4
SHIGERU YONEMURA ET AL.: "Improvement of Impact Energy Absorption by Using High Strength Steel, Part VIII-Forming Limit Prediction under Strain- path Changes for Automotive High Strength Steels", PREPRINTS OF MEETING ON AUTOMOTIVE ENGINEERS, 23 May 2007 (2007-05-23), pages 1 - 4
See also references of EP 2543983A4
Attorney, Agent or Firm:
KOKUBUN, Takayoshi (JP)
Takayoshi Kokubu (JP)
Takayoshi Kokubu (JP)
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Claims: