When conducting an assessment of the integrity of a structure the user is directed to classify the stresses as either primary stress or secondary stress. Residual stresses are usually classified as secondary stresses unless they exhibit significant elastic follow-up. In this paper the authors have first summarised current methods and origins of the UK R6 structural integrity assessment methodology for combining primary and secondary stresses. Then, using an idealised model, a new approach has been developed to examine how fixed-displacement secondary stresses interact and redistribute; this model permits a combined reference stress to be determined directly. This combined reference stress is intrinsically linked to the effect of elastic follow-up within the structure and provides a direct measure of how the residual stress relaxes between the extremes of fixed-load and fixed-displacement conditions. The results have been compared with the existing approaches in R6 and it has been demonstrated that the R6 method can be either conservative or non-conservative, depending on the degree of elastic follow-up and residual stress redistribution.
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ASME 2012 Pressure Vessels and Piping Conference
July 15–19, 2012
Toronto, Ontario, Canada
Conference Sponsors:
- Pressure Vessels and Piping Division
ISBN:
978-0-7918-5505-8
PROCEEDINGS PAPER
Determination of the Interaction Between Primary and Secondary Stresses Using an Idealised Model
Graeme Horne,
Graeme Horne
University of Bristol, Bristol, UK
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David J. Smith
David J. Smith
University of Bristol, Bristol, UK
Search for other works by this author on:
Graeme Horne
University of Bristol, Bristol, UK
David J. Smith
University of Bristol, Bristol, UK
Paper No:
PVP2012-78225, pp. 37-46; 10 pages
Published Online:
August 8, 2013
Citation
Horne, G, & Smith, DJ. "Determination of the Interaction Between Primary and Secondary Stresses Using an Idealised Model." Proceedings of the ASME 2012 Pressure Vessels and Piping Conference. Volume 6: Materials and Fabrication, Parts A and B. Toronto, Ontario, Canada. July 15–19, 2012. pp. 37-46. ASME. https://doi.org/10.1115/PVP2012-78225
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