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., Stekovic, S., Pattison, S., & 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.