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The Influence of Loading History on the Reliability of Welded Structures

[+] Author Affiliations
David Smith

University of Bristol, Bristol, UK

Amin Muhammed

TWI Ltd., Great Abington, Cambridge, UK

Paper No. OMAE2007-29303, pp. 203-212; 10 pages
  • ASME 2007 26th International Conference on Offshore Mechanics and Arctic Engineering
  • Volume 2: Structures, Safety and Reliability; Petroleum Technology Symposium
  • San Diego, California, USA, June 10–15, 2007
  • Conference Sponsors: Ocean, Offshore and Arctic Engineering Division
  • ISBN: 0-7918-4268-1 | eISBN: 0-7918-3799-8
  • Copyright © 2007 by ASME


The impact of prior loading on the structural performance of welded components is explored. In particular, probabilistic models are used to determine the change in the survival probability of a welded component where prior loading contributes to changes in both the fracture toughness and residual stresses. The effect of prior loading on toughness reveals that there are shifts in the mean toughness together with changes in the statistical distribution. While there is a large body of data that characterize residual stresses in welded components there is considerable uncertainty about the choice of the mean and statistical properties. Furthermore, there is only limited statistical evidence for changes in residual stress following prior loading. The evidence points to the adoption of a simple linear model to explain reductions in residual stress after prior loading. The combined experimental evidence for changes in toughness and residual stress are then incorporated into probabilistic models. The models are used to investigate the sensitivity of the input parameters to measures of the survivability of a welded component. Predictions are compared to experimental evidence from large scale tests. Importantly, it is revealed that by including prior loading into an assessment of the performance of a welded structure we may be able to claim that the structure’s reliability is consistently better than that expected at start of life.

Copyright © 2007 by ASME
Topics: Reliability



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