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RESIDUAL STRESS DISTRIBUTION MEASURING METHOD, CALCULATING METHOD, AND PROGRAM

Foreign code F210010290
File No. S2018-0990-C0
Posted date 2021年1月28日
Country 世界知的所有権機関(WIPO)
International application number 2019JP032870
International publication number WO 2020054347
Date of international filing 令和元年8月22日(2019.8.22)
Date of international publication 令和2年3月19日(2020.3.19)
Priority data
  • 特願2018-169714 (2018.9.11) JP
Title RESIDUAL STRESS DISTRIBUTION MEASURING METHOD, CALCULATING METHOD, AND PROGRAM
Abstract A residual stress distribution measuring method according to the present invention is characterized by including: a step of using an analytical model in which a cutting plane has been imparted to a cross section through a metal member, to calculate a residual force vector, which is the sum of a load vector acting on a first metal piece in the cutting plane, and a load vector acting on a second metal piece in the cutting plane; a step of calculating, as a correction displacement vector, an amount of movement in the cross section, by imparting the residual force vector to the cross section in the analytical model of the metal member, as a forced load; a step of correcting the shape, in the cutting plane, of the first or second metal piece, on the basis of the correction displacement vector calculated using the analytical model including a measured shape, in the cutting plane, of the first or second metal piece; and a step of calculating a residual stress distribution in the cross section by using the analytical model in which the shape, in the cutting plane, of the first or second metal piece has been corrected, to impart a forced displacement to the analytical model.
Outline of related art and contending technology BACKGROUND ART
In recent years, a ship, a representative bridge structure in the construction of a large size and, when assembling the members to each other, members for bonding is always present, the bonding technique is essential. In the bonding technique, has been widely used from the convenience of welding. However, with the construction of the welding, the welding portion in the vicinity of a high residual tensile stress occurs inevitably, due to fatigue, stress corrosion cracking (Stress Corrosion Cracking: SCC) and factors, may cause a brittle fracture when. Further, the stress balance occurs because the residual compressive stresses in the case of the thin plate member, the buckling deformation is likely to generate, may provide a large effect on the assembly. These stresses are generally referred to as weld residual stress, residual stress in the vicinity of a weld is evaluated for distribution on said welding is very important.
A low-cost and simple member as a method capable of measuring the residual stress inside the contour method can be cited. Contour method, the member to be measured 2 is cut into two, and division, with the release of residual stress by measuring the amount of elastic deformation of the cut surface, then, based on the measurement result, to calculate the residual stress distribution in the whole area of the cut surface (for example, see Patent Document 1).
  • Applicant
  • ※All designated countries except for US in the data before July 2012
  • UNIVERSITY PUBLIC CORPORATION OSAKA
  • Inventor
  • SHIBAHARA, Masakazu
  • IKUSHIMA, Kazuki
  • KAWAHARA, Atsushi
  • KAWAJIRI, Yoshitaka
  • OKIMI, Yui
IPC(International Patent Classification)
Specified countries National States: AE AG AL AM AO AT AU AZ BA BB BG BH BN BR BW BY BZ CA CH CL CN CO CR CU CZ DE DJ DK DM DO DZ EC EE EG ES FI GB GD GE GH GM GT HN HR HU ID IL IN IR IS JO KE KG KH KN KP KR KW KZ LA LC LK LR LS LU LY MA MD ME MG MK MN MW MX MY MZ NA NG NI NO NZ OM PA PE PG PH PL PT QA RO RS RU RW SA SC SD SE SG SK SL SM ST SV SY TH TJ TM TN TR TT TZ UA UG US UZ VC VN ZA ZM ZW
ARIPO: BW GH GM KE LR LS MW MZ NA RW SD SL SZ TZ UG ZM ZW
EAPO: AM AZ BY KG KZ RU TJ TM
EPO: AL AT BE BG CH CY CZ DE DK EE ES FI FR GB GR HR HU IE IS IT LT LU LV MC MK MT NL NO PL PT RO RS SE SI SK SM TR
OAPI: BF BJ CF CG CI CM GA GN GQ GW KM ML MR NE SN ST TD TG

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