Title:
IMPROVEMENT METHOD OF FATIGUE LIFE AND MANUFACTURING METHOD OF STRUCTURE
Document Type and Number:
Japanese Patent JP2017138142
Kind Code:
A
Abstract:
PROBLEM TO BE SOLVED: To provide an improvement method of a fatigue life of a structure capable of suppressing decline of the fatigue life which is caused by a stopper hole for the purpose of measuring residual stress by a piercing method.SOLUTION: A method improves a fatigue life of a structure having a steel member 10 opened with a stopper hole 11 for measuring a residual stress by a piercing process, and includes a step of applying a peening process for hitting with a pin to a bottom face 11a of a stopper hole. In the step of applying the peening process to the bottom face 11a, a mode of pressing a region positioned at the bottom face 11a of the stopper hole toward a depth direction and toward the outside from a center of the stopper hole 11 can be adopted. The mode may preferably include a step of applying the peening process to a boundary between a side face 11b of the stopper hole and a surface 10a of the steel member. In the peeing process, the use of a pin having a diameter equal to or less than 98% of the stopper hole 11 and a radius of curvature of the top end equal to or less than 300% is preferable.SELECTED DRAWING: Figure 1C
Inventors:
YONEZAWA TAKAYUKI
SHIMANUKI HIROSHI
HIMENO MASASHI
SAKURA TSUTOMU
SHIMANUKI HIROSHI
HIMENO MASASHI
SAKURA TSUTOMU
Application Number:
JP2016017852A
Publication Date:
August 10, 2017
Filing Date:
February 02, 2016
Export Citation:
Assignee:
NIPPON STEEL & SUMITOMO METAL CORP
International Classes:
G01L1/00; C21D7/06; G01M99/00
Attorney, Agent or Firm:
Ascend Patent Business Corporation
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