Lower-bound limit load estimates are relevant from a standpoint of pressure component design, and are acceptable quantities for ascertaining primary stress limits. Elastic modulus adjustment procedures, used in conjunction with linear elastic finite element analyses, generate both statically admissible stress distributions and kinematically admissible strain distributions. Mura’s variational formulation for determining limit loads, originally developed as an alternative to the classical method, is extended further by allowing the elastic calculated stress fields to exceed yield provided they satisfy the “integral mean of yield” criterion. Consequently, improved lower-bound values for limit loads are obtained by solving a simple quadratic equation. The improved lower-bound limit load determination procedure, which is designated “the method,” is applied to symmetric as well as nonsymmetric components. [S0094-9930(00)01103-3]
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August 2000
Technical Papers
Limit Loads Using Extended Variational Concepts in Plasticity
R. Seshadri
R. Seshadri
Faculty of Engineering and Applied Science, Memorial University of Newfoundland, St. John’s, Newfoundland, Canada A1B 3X5
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R. Seshadri
Faculty of Engineering and Applied Science, Memorial University of Newfoundland, St. John’s, Newfoundland, Canada A1B 3X5
Contributed by the Pressure Vessels and Piping Division for publication in the JOURNAL OF PRESSURE VESSEL TECHNOLOGY. Manuscript received by the PVP Division, February 1, 2000; revised manuscript received April 3, 2000. Technical Editor: S. Y. Zamrik.
J. Pressure Vessel Technol. Aug 2000, 122(3): 379-385 (7 pages)
Published Online: April 3, 2000
Article history
Received:
February 1, 2000
Revised:
April 3, 2000
Citation
Seshadri, R. (April 3, 2000). "Limit Loads Using Extended Variational Concepts in Plasticity ." ASME. J. Pressure Vessel Technol. August 2000; 122(3): 379–385. https://doi.org/10.1115/1.556196
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