Prediction of creep crack initiation behaviour in 316H stainless steel using stress dependent creep ductility

Hanna Quintero, Ali Mehmanparast*

*Corresponding author for this work

Research output: Contribution to journalArticlepeer-review

43 Citations (Scopus)
26 Downloads (Pure)

Abstract

The creep crack initiation behaviour of Type 316H stainless steel at 550 °C has been predicted by implementing a stress dependent creep ductility and average creep strain rate model in finite element analyses. Simulations were performed on five specimen geometries: C(T), CS(T), DEN(T), M(T) and SEN(T). The predicted results have been characterised using the C fracture mechanics parameter and the short-term, long-term and transition creep crack initiation trends are predicted for each of the specimen geometries examined. The prediction results have been validated through comparison with experimental data available in the literature. The predicted short-term and long-term creep crack initiation trends have also been compared with NSW prediction lines. The predicted results, from each specimen geometry, are compared to each other and the differences in crack initiation trends have been discussed in terms of the specimen geometry, in-plane constraint and stress level effects on the creep crack initiation behaviour of the material. A mesh sensitivity analysis has also been performed to find the optimum mesh size for performing crack initiation simulations.

Original languageEnglish
Pages (from-to)101-115
Number of pages15
JournalInternational Journal of Solids and Structures
Volume97-98
DOIs
Publication statusPublished - 15 Oct 2016

Keywords

  • 316H stainless steel
  • constraint effects
  • creep crack initiation
  • creep ductility
  • long term
  • specimen geometry
  • transition

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