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Experimental Determination of Elastic and Plastic LLD Rates During Creep Crack Growth Testing

[+] Author Affiliations
K. M. Tarnowski

The University of Sheffield, Sheffield, UK

C. M. Davies, K. M. Nikbin

Imperial College London, London, UK

D. W. Dean

EDF Energy Generation, Gloucester, UK

Paper No. PVP2017-65685, pp. V06AT06A066; 7 pages
doi:10.1115/PVP2017-65685
From:
  • ASME 2017 Pressure Vessels and Piping Conference
  • Volume 6A: Materials and Fabrication
  • Waikoloa, Hawaii, USA, July 16–20, 2017
  • Conference Sponsors: Pressure Vessels and Piping Division
  • ISBN: 978-0-7918-5799-1
  • Copyright © 2017 by ASME

abstract

Elastic and plastic load line displacement (LLD) rates are often ignored when analyzing Creep Crack Growth (CCG) tests due to difficulties in accurately determining their value for complex crack morphologies typical of creep. Instead, the total LLD rate is assumed to be entirely due to creep. This simplistic approach overestimates the crack tip characterizing parameter C* which is non-conservative.

This paper presents a review of the current method of interpreting CCG test data in ASTM E1457 and proposes an improved approach which accounts for the elastic and plastic LLD rates. Estimations of the elastic and plastic LLD rate are obtained from a partial unload immediately after load-up and a full unload, at the end of the test, prior to final failure. Some finite element validation of this method is presented. Implementing this approach will facilitate more realistic CCG laws.

Copyright © 2017 by ASME

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