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Verification of Alternative Criteria for Shakedown Evaluation Using Flat Head Vessel

[+] Author Affiliations
Seiji Asada

Mitsubishi Heavy Industries, Ltd., Kobe, Hyogo, Japan

Norimichi Yamashita

Tokyo Electric Power Company, Tokyo, Japan

Asao Okamoto

Ishikawajima-Harima Heavy Industries Co., Ltd., Yokohama, Kanagawa, Japan

Isoharu Nishiguchi

Kanagawa Institute of Technology, Atsugi, Kanagawa, Japan

Paper No. PVP2002-1217, pp. 17-22; 6 pages
doi:10.1115/PVP2002-1217
From:
  • ASME 2002 Pressure Vessels and Piping Conference
  • Pressure Vessel and Piping Codes and Standards
  • Vancouver, BC, Canada, August 5–9, 2002
  • Conference Sponsors: Pressure Vessels and Piping Division
  • ISBN: 0-7918-4650-4
  • Copyright © 2002 by ASME

abstract

Alternative stress evaluation criteria suitable for Finite Element Analysis (FEA) proposed by Okamoto et al. [1] have been studied by the Committee on Three Dimensional Finite Element Stress Evaluation (C-TDF) in Japan. Thermal stress ratchet criteria in plastic FEA are now under consideration. Two criteria are proposed: evaluating variations in plastic strain increments and evaluating variations in the elastic core region. To verify the validity of these criteria, calculations were performed for several typical models in C-TDF [2]. This paper shows calculations and evaluation results of a Flat Head Vessel for shakedown. To study shakedown criteria for gross structural discontinuity, a flat head vessel is surveyed. The flat head vessel consists of a stiff flat head and a shell and is subjected internal pressure and thermal cycle. The elastic shakedown area and the plastic area are compared and plastic strain increments are surveyed. A shakedown evaluation method based on distribution of elastic-plastic strain range is proposed.

Copyright © 2002 by ASME
Topics: Vessels

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