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Estimating Lower Bound Limit Loads: No Iterations/Modulus Adjustment

[+] Author Affiliations
C. Hari Manoj Simha

CANMET Materials Technology Laboratory, Hamilton, ON, Canada

Reza Adibi-Asl

AMEC NSS, Toronto, ON, Canada

Paper No. PVP2012-78558, pp. 93-99; 7 pages
doi:10.1115/PVP2012-78558
From:
  • ASME 2012 Pressure Vessels and Piping Conference
  • Volume 2: Computer Technology and Bolted Joints
  • Toronto, Ontario, Canada, July 15–19, 2012
  • Conference Sponsors: Pressure Vessels and Piping Division
  • ISBN: 978-0-7918-5501-0
  • Copyright © 2012 by ASME

abstract

We use the extended variational form of Mura and co-workers to estimate the lower bound limit loads for structures acted upon by a single load. Our scheme requires one elastic stress field either from a conventional finite element computation or analytical solution. No iterative stress field adjustments are required. We also adapt the scheme for structures with flaws by advancing a criterion that may be used to select sub-volumes of the structure that do not participate in the collapse. For structures with flaws, no ad hoc elastic modulus reduction at the stress concentration is required. Application of the proposed method is illustrated for some typical flawed and flaw-free structures and it is shown that the obtained multipliers are not overly conservative.

Copyright © 2012 by ASME
Topics: Stress

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