Title:
冷間成形角形鋼管の変形状態評価方法
Document Type and Number:
Japanese Patent JP5644436
Kind Code:
B2
Abstract:
PROBLEM TO BE SOLVED: To provide a deformation state evaluation method for determining whether or not a cold-forming square steel pipe having a small width-thickness ratio, in which breaking becomes the ultimate state thereof when being subjected to a bending force, reaches an ultimate deformation state.SOLUTION: In a deformation state evaluation method for cold-forming square steel pipe, a stress-strain relation in each portion of the cold-forming square steel pipe on the occasion of a bending force applied thereon is obtained by an FEM (Finite Element Method) analysis. Then, while a portion in which a local strain advances most quickly is regarded as the highest-risk portion, it is determined that a point of time when an equivalent strain of the highest risk portion reaches a uniform elongation of a material is that of the ultimate deformation state. When the FEM analysis is performed, the stress-strain relation in a weld heat-affected zone of the cold-forming square steel pipe is decided by using the hardness test results of the weld heat-affected zone and the stress-strain relation in a base metal part.
Inventors:
中川 佳
加村 久哉
加村 久哉
Application Number:
JP2010269959A
Publication Date:
December 24, 2014
Filing Date:
December 03, 2010
Export Citation:
Assignee:
ＪＦＥスチール株式会社
International Classes:
G01N3/08; G06F17/50
Attorney, Agent or Firm:
Shigeru Inoue
Woods Kazuhiro
Woods Kazuhiro