Finite Element Modeling of Hot Compression Testing of Titanium Alloys
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Authors
Mishra, Sumeet
Daniel, Christopher S
da Fonseca, Joao Quinta
Publication Date
2022-03-14Journal Title
Journal of Materials Engineering and Performance
ISSN
1059-9495
Publisher
Springer Science and Business Media LLC
Type
Article
This Version
VoR
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Jedrasiak, P., Shercliff, H., Mishra, S., Daniel, C. S., & da Fonseca, J. Q. (2022). Finite Element Modeling of Hot Compression Testing of Titanium Alloys. Journal of Materials Engineering and Performance https://doi.org/10.1007/s11665-022-06750-3
Abstract
This paper presents experimental results and finite element analysis of hot upsetting of titanium alloys Ti64
and Ti407 using a dilatometer in loading mode. All samples showed barrelling, as a consequence of an
inhomogeneous temperature distribution and friction. The FE analysis is a full thermomechanical model of
the test calibrated using multiple thermocouples. At each nominal temperature and strain-rate, the true flow
stress-strain response is inferred using the difference between the initially assumed constitutive response input
to the FE analysis, 𝜎𝜎 = 𝑓𝑓(𝑇𝑇, 𝜀𝜀˙, 𝜀𝜀), and the predicted response of the model. The analysis applies new
procedures for: (i) modelling the thermal gradient; (ii) finding the flow stress correction due to the
inhomogeneity, using literature data as the input to the FE analysis; (iii) smoothing the constitutive data, fitting
empirical 𝜎𝜎 = 𝑓𝑓(𝑇𝑇, 𝜀𝜀˙) surfaces at multiple discrete strains. The extracted true constitutive data confirms the
moderate strain-softening behaviour in Ti64 alloy, and the FE model predicts the distribution of local
deformation conditions, for application in interpretation of microstructure and texture evolution. This
highlights the difference between nominal and actual test conditions, showing that the discrepancy varies
systematically with test conditions, with the central strain and strain-rate being magnified significantly, by
factors of order 2–3.
Sponsorship
Engineering and Physical Sciences Research Council (EP/R001715/1)
Identifiers
External DOI: https://doi.org/10.1007/s11665-022-06750-3
This record's URL: https://www.repository.cam.ac.uk/handle/1810/335073
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