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Post-yield characterisation of metals with significant pile-up through spherical indentations

Post-yield characterisation of metals with significant pile-up through spherical indentations
Post-yield characterisation of metals with significant pile-up through spherical indentations
Finite element simulations of spherical indentations accounting for frictional contact provide validated load–indentation output for assessing and improving existing methods used to determine the stress–strain curve of materials with significant pile-up. The importance of friction to the proper assessment of the pile-up effect is established. Weaknesses in current characterisation relations and procedures are also identified. Existing correction formulae accounting for pile-up are modified so that the contact area radius is more accurately determined. This modification is implemented in the context of a characterisation process that relies on analysing unloading portions of load–indentation curves. Post-yield material behaviour predictions from such analysis are found to be in very good agreement with the initial finite element material input.
plastic deformation, macroindentation, finite element analysis, steels, stress–strain relation
1359-6454
1965-1973
Habbab, H.
be9ccb6a-f26e-4b68-bad8-c2e29f9f867e
Mellor, B.G.
2b13b80f-880b-49ac-82fe-827a15dde2fe
Syngellakis, S.
1279f4e2-97ec-44dc-b4c2-28f5ac9c2f88
Habbab, H.
be9ccb6a-f26e-4b68-bad8-c2e29f9f867e
Mellor, B.G.
2b13b80f-880b-49ac-82fe-827a15dde2fe
Syngellakis, S.
1279f4e2-97ec-44dc-b4c2-28f5ac9c2f88

Habbab, H., Mellor, B.G. and Syngellakis, S. (2006) Post-yield characterisation of metals with significant pile-up through spherical indentations. Acta Materialia, 54 (7), 1965-1973. (doi:10.1016/j.actamat.2005.12.021).

Record type: Article

Abstract

Finite element simulations of spherical indentations accounting for frictional contact provide validated load–indentation output for assessing and improving existing methods used to determine the stress–strain curve of materials with significant pile-up. The importance of friction to the proper assessment of the pile-up effect is established. Weaknesses in current characterisation relations and procedures are also identified. Existing correction formulae accounting for pile-up are modified so that the contact area radius is more accurately determined. This modification is implemented in the context of a characterisation process that relies on analysing unloading portions of load–indentation curves. Post-yield material behaviour predictions from such analysis are found to be in very good agreement with the initial finite element material input.

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Published date: 2006
Keywords: plastic deformation, macroindentation, finite element analysis, steels, stress–strain relation

Identifiers

Local EPrints ID: 28968
URI: http://eprints.soton.ac.uk/id/eprint/28968
ISSN: 1359-6454
PURE UUID: 1d7b364e-fed0-4f93-b501-3f13d35b9492

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Date deposited: 09 May 2006
Last modified: 15 Mar 2024 07:28

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Contributors

Author: H. Habbab
Author: B.G. Mellor
Author: S. Syngellakis

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