Correlations between creep parameters and application to probabilistic damage assessments

Nader Zentuti*, Julian Booker, Richard Bradford, Christopher Truman

*Corresponding author for this work

Research output: Contribution to journalArticle (Academic Journal)

1 Citation (Scopus)
137 Downloads (Pure)

Abstract

This work formalises an approach for identifying and implementing correlations in probabilistic creep crack initiation assessments. The methodology is based on partitioning data obtained from uniaxial creep test results into subsets according to temperature and stress. This work is focused on 316H stainless steel and is concerned with identifying correlations between creep deformation, creep ductility and rupture life. However, the methodology can be implemented to identify correlations for any material and any combination of properties. An implementation method is also presented for sampling correlated parameters in Monte-Carlo simulations using the Spearman rank order correlation. This is followed by a discussion of the key effects that incorporating correlations might have on probabilistic creep damage results. While a degree of correlation between ductility and creep deformation exists, it was found to be uncertain. Conducting post-assessment sensitivity analyses based on uncorrelated parameters is suggested as a means for providing focus as to which correlations are most important for the assessment results.

Original languageEnglish
Pages (from-to)295-305
Number of pages11
JournalInternational Journal of Pressure Vessels and Piping
Volume165
Early online date7 Jul 2018
DOIs
Publication statusPublished - 1 Aug 2018

Keywords

  • Correlations
  • Creep
  • Damage
  • Monte-Carlo
  • Probabilistic
  • Sensitivity analysis

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