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Application of Limit Load Analysis to Complex Structures

[+] Author Affiliations
Adam Towse

Assystem UK Ltd., Sunderland, UK

Michael Martin, Paul Hurrell, Rob Philipson, Adrian Allen, Chris Andrews

Rolls-Royce PLC, Derby, UK

Paper No. PVP2012-78040, pp. 807-812; 6 pages
doi:10.1115/PVP2012-78040
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 Rolls Royce plc

abstract

There is currently little specific guidance on the application of Finite Element Based Limit Load Analysis to determine the primary load capacity of structures in the current ASME BPVC Section III. Consequently, a draft Code Case is currently under development to provide a structured framework within which such assessments may be made.

In this paper, the proposed Code Case methodology has been applied to demonstrate the process by which the primary load capacity of two geometrically complex structures may be calculated. The first structure is a curved pipe elbow into which a nozzle entry is placed, the second structure a large pressure vessel incorporating bolted joints.

The proposed Code Case step-by-step methodology is followed, including investigations into the propensity of the structures to exhibit geometric weakening or strengthening. The initial limit loads are calculated, and by selective application of elastic material, subsequent failure loads are calculated allowing design factors beyond initial failure to be determined.

Additional studies are also presented, investigating the effect of element types and secondary pre-stress effects on the failure modes.

Copyright © 2012 by Rolls Royce plc
Topics: Stress

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