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Mechanical ratcheting of stainless-clad pipe subjected to internal pressure and cyclic axial load or cyclic bending.

Research Project

Project/Area Number 02650073
Research Category

Grant-in-Aid for General Scientific Research (C)

Allocation TypeSingle-year Grants
Research Field 材料力学
Research InstitutionHiroshima University

Principal Investigator

YOSHIDA Fusahito  Hiroshima Univ., Faculty of Engineering, Associate Professor, 工学部, 助教授 (50016797)

Co-Investigator(Kenkyū-buntansha) OKADA Tatsuo  Hiroshima Univ., Faculty of Engineering, Research Associate, 工学部, 助手 (00233338)
HATAYAMA Haruaki  Hiroshima Univ., Faculty of Engineering, Research Associate, 工学部, 助手 (50112181)
Project Period (FY) 1990 – 1991
Project Status Completed (Fiscal Year 1991)
Budget Amount *help
¥1,900,000 (Direct Cost: ¥1,900,000)
Fiscal Year 1991: ¥600,000 (Direct Cost: ¥600,000)
Fiscal Year 1990: ¥1,300,000 (Direct Cost: ¥1,300,000)
KeywordsStainless-Clad Pipe / Mechanical Ratcheting / Internal Pressure / Cyclic Axial Load / Cyclic Bending / Experiment / Cyclic Plasticity / FEM Analysis / ラチェット / 非弾性 / 構成式 / シェイクダウン
Research Abstract

Mechanical ratcheting behavior of a stainless-clad pipe(SUS304/STPG38)subjected to internal pressure and cyclic axial straining or cyclic bending was investigated. An elastic-plastic FEM analysis of the mechanical ratcheting was perfomed and the analytical results were compared with the corresponding experimental results.
(1)In the ratcheting of internal pressure with cyclic straining, circumferencial strain accumulated with strain cycles, and the higher ratcheting strain rate was observed under the conditions of larger cyclic strain range and larger internal pressure. Shakedown of ratcheting was obserbed in SUS304 after about 10 strain cycles, whearas remarkable ratcheting strain accumulated in every strain cycle in STPG38 steel. In the clad pipe remarkable ratcheting strain accumulation appearing in STPG38 was prevented by SUS304. and the ratcheting strain rate of the clad pipe was between the rates of SUS304 and STPG38. Ratcheting tests were performed in two levels of clad ratio(thickness ratio), SUS304/STPG38 = 0.5 and 1.0, but no apparent difference in ratcheting behavior was found.
(2)In the ratcheting of internal pressure with cyclic bending, larger strain accumulation was observed compared with the ratcheting of internal pressure with cyclic axial straining.
(3)The FEM analysis overestimated the ratcheting strain accumulation. It seems to come from the problem of constitutive modeling for the steels, and the improvement of the modeling is required.

Report

(3 results)
  • 1991 Annual Research Report   Final Research Report Summary
  • 1990 Annual Research Report
  • Research Products

    (6 results)

All Other

All Publications (6 results)

  • [Publications] Fusahito YOSHIDA: "Uniaxial and biaxial creep-ratcheting behavior of SUS304 stainless steel at room temperature" International Journal of Pressure Vessel and Piping. 44. 207-233 (1990)

    • Description
      「研究成果報告書概要(和文)」より
    • Related Report
      1991 Final Research Report Summary
  • [Publications] 吉田 総仁: "SUS304の室温における単軸および多軸応力下のクリ-プ・ラチェット挙動" 第42回塑性加工連合講演会講演論文集. 1. 371-374 (1991)

    • Description
      「研究成果報告書概要(和文)」より
    • Related Report
      1991 Final Research Report Summary
  • [Publications] Fusahito YOSHIDA: "Uniaxial and biaxial creep-ratcheting of SUS304 stainless steel at room temperature" Int. J. Pressure Vessel and Piping. 44. 207-223 (1990)

    • Description
      「研究成果報告書概要(欧文)」より
    • Related Report
      1991 Final Research Report Summary
  • [Publications] Fusahito YOSHIDA: "Uniaial and biaxial creepーratchetiong behavior of SUS304 stainless steel at room temperature" International Jourrnal of pressure Vessel and Pioing. 44. 207-223 (1990)

    • Related Report
      1991 Annual Research Report
  • [Publications] 吉田 総仁: "SUS304の室温における単軸および多軸応力下のクリ-プ・ラチェット挙動" 第42回塑性加工連合講演論文集. I. 371-374 (1991)

    • Related Report
      1991 Annual Research Report
  • [Publications] Fusahito Yoshida: "Uniaxial and Biaxial Creepーratcheting Behavior of SUS304 Stainless Steel at Room Temperature" International Journal of Pressure Vessels and Piping. 44. 208-223 (1990)

    • Related Report
      1990 Annual Research Report

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Published: 1990-04-01   Modified: 2016-04-21  

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