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Effect of Yield Strength to Elastic Modulus Ratio on Finite Element Based Plastic Loads for Elbows Under Bending

[+] Author Affiliations
Kuk-Hee Lee, Yun-Jae Kim

Korea University, Seoul, South Korea

Paper No. PVP2008-61775, pp. 315-324; 10 pages
  • ASME 2008 Pressure Vessels and Piping Conference
  • Volume 5: High Pressure Technology; Nondestructive Evaluation Division; Student Paper Competition
  • Chicago, Illinois, USA, July 27–31, 2008
  • Conference Sponsors: Pressure Vessels and Piping
  • ISBN: 978-0-7918-4828-9 | eISBN: 0-7918-3828-5
  • Copyright © 2008 by ASME


This paper quantifies the effect of the yield strength-to-elastic modulus ratio (yield strain) on plastic loads (defined by the twice-elastic-slope according to the ASME code) for 90° elbows under in-plane and out-of-plane bending. Results are based on extensive and systematic FE limit analyses assuming elastic-perfectly plastic materials. Based on FE results, a simple approximation of plastic loads of pipe bends, incorporating the yield strength-to-elastic modulus ratio effect, is proposed. To validate the proposed approximation, predicted plastic moments are compared with published full-scale pipe test data, showing that the proposed approximation gives overall lower than the FE results and close to experimental values.

Copyright © 2008 by ASME



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