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Elevated Temperature Primary Load Design Method Using Pseudo Elastic-Perfectly Plastic Model

[+] Author Affiliations
Peter Carter

Stress Engineering Services Inc., Mason, OH

T.-L. (Sam) Sham

Oak Ridge National Laboratory, Oak Ridge, TN

R. I. Jetter

Consultant, Pebble Beach, CA

Paper No. PVP2012-78081, pp. 739-748; 10 pages
doi:10.1115/PVP2012-78081
From:
  • ASME 2012 Pressure Vessels and Piping Conference
  • Volume 1: Codes and Standards
  • Toronto, Ontario, Canada, July 15–19, 2012
  • Conference Sponsors: Pressure Vessels and Piping Division
  • ISBN: 978-0-7918-5500-3
  • Copyright © 2012 by ASME

abstract

A new primary load design method for elevated temperature service has been developed. Codification of the procedure in an ASME Boiler and Pressure Vessel Code, Section III Code Case is being pursued. The proposed primary load design method is intended to provide the same margins on creep rupture, yielding and creep deformation for a component or structure that are implicit in the allowable stress data. It provides a methodology that does not require stress classification and is also applicable to a full range of temperature above and below the creep regime. Use of elastic-perfectly plastic analysis based on allowable stress with corrections for constraint, steady state stress and creep ductility is described. This approach is intended to ensure that traditional primary stresses are the basis for design, taking into account ductility limits to stress re-distribution and multiaxial rupture criteria.

Copyright © 2012 by ASME

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