Creep rupture data assessment – new uncertain challenges require new uncertain answers

ABSTRACT

For the service life calculation of high-temperature components the knowledge of the creep behaviour of the materials used remain essential. Over decades, many methods have been developed for extrapolating creep rupture strengths. The challenge with these Creep Rupture Data Assessments (CRDAs), however, always remains evaluating the predictive accuracy of creep life. New computer-aided calculation methods allow the use of extensive data on the casts and other experimental data, as well as the application of probabilistic methods. Within the ECCC, software tools are being developed that both leverage the capabilities of new powerful computer-aided computational methods and allow for simultaneous assessment with post-assessment testing in accordance with ECCC recommendations. The authors would like to point out that despite all available tools and guidelines, the expertise and experience of the assessor is an indispensable guarantor for a reliable evaluation.

KEYWORDS:

• Creep
• creep rupture data
• assessment
• post assessment tests
• maximum likelihood
• probabilistic lifetime model

Acknowledgments

The authors would like to thank the ECCC for its technical and financial support. “So long, and thanks for all the fish” [39].

Disclosure statement

No potential conflict of interest was reported by the author(s).

Additional information

Funding

This work was supported by the ECCC European Creep Collaborative Committee.