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Deformation field interaction in sequential circular indentation of a strain hardening material

Wang, Z and Murthy, TG and Saldana, C (2019) Deformation field interaction in sequential circular indentation of a strain hardening material. In: Philosophical Magazine .

10.1080@14786435.2019.1580396.pdf - Published Version

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Official URL: https://doi.org/10.1080/14786435.2019.1580396


An experimental study was made to characterise and model the deformation field in sequential circular indentation of a model strain hardening material. Digital image correlation was used to measure the evolving subsurface deformation field in terms of displacement, strain rate and strain as a function of indentation spacing and depth. These measurements were used to validate a finite element model for complementary simulations. The results identify relationships between sequential indentation parameters and overlap of subsurface strain distributions, maximum subsurface strains and indentation loads. Maximum strain and the degree of strain field overlap in the deformed subsurface were maximised when the ratio of indentation spacing (S) to projected indentation contact length (L) was approximately S/L = 1.1, 1.2. Also discussed are the implications for understanding process-scale considerations for indentation-based mechanical surface treatments, including energy dissipation and relationship of surface coverage measures to subsurface strain overlap. Relative differences in energy expended were found for conditions that produce similar levels of subsurface plastic strain and strain field overlap. Finally, the role of sequential indentation parameters on strain path changes and path reversals in the deformed subsurface is investigated and discussed in the context of heterogeneous mechanics and corresponding effects on subsurface microstructure evolution. © 2019, © 2019 Informa UK Limited, trading as Taylor & Francis Group.

Item Type: Journal Article
Publication: Philosophical Magazine
Publisher: Taylor and Francis Ltd.
Additional Information: Copyright for this article belongs to Informa UK Limited.
Keywords: Deformation; Energy dissipation; Finite element method; Image analysis; Indentation; Strain hardening; Strain measurement, Digital image correlations; experimental; Finite element modelling; Hardening materials; Mechanical surface treatment; Strain path change; Subsurface deformation; Subsurface microstructure, Strain rate
Department/Centre: Division of Mechanical Sciences > Civil Engineering
Date Deposited: 10 Apr 2019 05:15
Last Modified: 10 Apr 2019 05:15
URI: http://eprints.iisc.ac.in/id/eprint/62038

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