Modelling the influence of plasticity induced softening on the low cycle fatigue and crack propagation behaviour of a nickel-based superalloy

Engel, B.; Lavie, W.J.; Rouse, J.P.; Whittaker, M.T.; Jones, J.P.; Lancaster, R.; Stekovic, S.; Pattison, S.J.; Hyde, C.J.

Abstract

Cyclic hysteresis loops generated during high-temperature, isothermal, low-cycle fatigue testing of the nickel-based superalloy RR1000 revealed a gradual decrease in elastic modulus of up to 25 % compared to the initial value in dependence of the accumulated plastic strain. Based on the experimental observations, a material model was developed and implemented within a finite element solver to investigate the effect of degrading stiffness on crack growth laws and crack growth predictions. It was shown that the stress intensity factor diminished by 6 to 8 % and crack growth rates were 14 to 20 % higher when stiffness degradation was accounted for.

Citation

Engel, B., Lavie, W., Rouse, J., Whittaker, M., Jones, J., Lancaster, R., …Hyde, C. (2024). Modelling the influence of plasticity induced softening on the low cycle fatigue and crack propagation behaviour of a nickel-based superalloy. Computational Materials Science, 231, Article 112604. https://doi.org/10.1016/j.commatsci.2023.112604

• Journal Article Type: Article
• Acceptance Date: Oct 23, 2023
• Online Publication Date: Nov 1, 2023
• Publication Date: Jan 5, 2024
• Deposit Date: Nov 8, 2023
• Publicly Available Date: Nov 8, 2023
• Journal: Computational Materials Science
• Print ISSN: 0927-0256
• Electronic ISSN: 1879-0801
• Publisher: Elsevier
• Peer Reviewed: Peer Reviewed
• Volume: 231
• Article Number: 112604
• DOI: https://doi.org/10.1016/j.commatsci.2023.112604
• Keywords: Cyclic nano-indentation; Stress intensity factor; Crack propagation; Crack growth; Nickel-based superalloy; High temperature
• Public URL: https://nottingham-repository.worktribe.com/output/26811456
• Publisher URL: https://www.sciencedirect.com/science/article/pii/S0927025623005980
• Additional Information: This article is maintained by: Elsevier; Article Title: Modelling the influence of plasticity induced softening on the low cycle fatigue and crack propagation behaviour of a nickel-based superalloy; Journal Title: Computational Materials Science; CrossRef DOI link to publisher maintained version: https://doi.org/10.1016/j.commatsci.2023.112604; Content Type: article; Copyright: © 2023 The Author(s). Published by Elsevier B.V.