Volume 46, Issue 1 pp. 212-227
ORIGINAL ARTICLE

Data-driven prediction of the probability of creep–fatigue crack initiation in 316H stainless steel

Saeed Zare Chavoshi

Saeed Zare Chavoshi

Department of Materials, University of Oxford, Oxford, UK

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Vito L. Tagarielli

Corresponding Author

Vito L. Tagarielli

Department of Aeronautics, Imperial College London, London, UK

Correspondence

Vito L. Tagarielli, Department of Aeronautics, Imperial College London, London SW7 2AZ, UK.

Email: [email protected]

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First published: 17 October 2022
Citations: 4

Abstract

Stainless steel components in advanced gas-cooled reactors (AGRs) are susceptible to creep–fatigue cracking at high temperatures. Quantifying the probability of creep–fatigue crack initiation requires probabilistic numerical simulations; these are complex and computationally intensive. Here, we present a data-driven approach to develop fast probabilistic surrogate models of creep–fatigue crack initiation in 316H stainless steel. We perform a set of Monte Carlo simulations based on the R5V2/3 high temperature assessment procedure and determine the sensitivity of the probability of crack initiation to loads and operating conditions. The data are used to train different supervised machine learning models considering Bayesian hyperparameter optimization. We discuss the relative performance of such models and show that a gradient tree boosting algorithm results in surrogate models with the highest accuracy.

Highlights

  • A data-driven approach to predict failure probability is introduced.
  • Monte Carlo simulations based on the R5V2/3 are performed.
  • Gradient tree boosting algorithm results in surrogate models with the highest accuracy.
  • Operating temperature accounts for more than 60% of the regression power in the surrogate model.

CONFLICT OF INTEREST

The authors declare that they have no known competing financial interests or personal relationships that could have appeared to influence the work reported in this paper.

DATA AVAILABILITY STATEMENT

The data that support the findings of this study are available from the corresponding author upon reasonable request.

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