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High temperature strain heterogeneities tracking within hole-specimens of FV566 turbine steel via digital image correlation

Bao, Jianguang; Benaarbia, Adil; Bao, Siyuan; Guo, Xiaofeng; Wang, Yonghong; Sun, Wei

Authors

Jianguang Bao

Adil Benaarbia

Siyuan Bao

Xiaofeng Guo

Yonghong Wang

Wei Sun



Contributors

Wei Sun
Supervisor

Jianguang Bao
Researcher

Abstract

This paper presents experimental and numerical investigations to study spatial-temporal distributions of strain heterogeneities within a FV566 turbine rotor steel subjected to high temperature conditions. Strain field were determined during monotonic tensile tests performed on flat specimens containing a circular hole to give rise to heterogeneous strain fields. A home-made digital image correlation system with an image restoration module was developed and employed to record and analyse the deformation process till the macroscopic fracture of the investigated specimens. Noticeable in-plane strain concentration zones and effects of the sample design were highlighted and deeply examined. Experimental results combined with finite element analyses based on a classical Johnson-Cook model indicated that the hole shape was the important factor affecting the strength and the spatio-temporal distribution of the strain fields. Microstructural investigations were also conducted to characterize and assess the microscale damage features of the FV566 steel. The ruptured area for all the investigated temperature tests revealed ductile rupture behaviour. Changes on grain boundaries and misorientation near strain localized regions were also investigated. It was found that the propagation of cracks surrounding the hole in FV566 specimens was mainly affected by the nucleation and propagation of strain localization zones.

Citation

Bao, J., Benaarbia, A., Bao, S., Guo, X., Wang, Y., & Sun, W. (2020). High temperature strain heterogeneities tracking within hole-specimens of FV566 turbine steel via digital image correlation. Materials Science and Engineering: A, 777, 139068. https://doi.org/10.1016/j.msea.2020.139068

Journal Article Type Article
Acceptance Date Feb 4, 2020
Online Publication Date Feb 6, 2020
Publication Date Mar 10, 2020
Deposit Date Feb 5, 2020
Publicly Available Date Feb 7, 2021
Journal Materials Science and Engineering: A
Print ISSN 0921-5093
Electronic ISSN 0921-5093
Publisher Elsevier
Peer Reviewed Peer Reviewed
Volume 777
Article Number 139068
Pages 139068
DOI https://doi.org/10.1016/j.msea.2020.139068
Keywords Mechanical Engineering; General Materials Science; Mechanics of Materials; Condensed Matter Physics
Public URL https://nottingham-repository.worktribe.com/output/3902454
Publisher URL https://www.sciencedirect.com/science/article/pii/S0921509320301568
Additional Information This article is maintained by: Elsevier; Article Title: High temperature strain heterogeneities tracking within hole-specimens of FV566 turbine steel via digital image correlation; Journal Title: Materials Science and Engineering: A; CrossRef DOI link to publisher maintained version: https://doi.org/10.1016/j.msea.2020.139068; Content Type: article; Copyright: © 2020 Elsevier B.V. All rights reserved.