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A robust inverse analysis method to estimate the local tensile properties of heterogeneous materials from nano-indentation data

De Bono, Damaso, London, T, Baker, Mark and Whiting, Mark (2017) A robust inverse analysis method to estimate the local tensile properties of heterogeneous materials from nano-indentation data International Journal of Mechanical Sciences, 123. pp. 162-176.

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Abstract

Most current analysis of nano-indentation test data assumes the sample to behave as an isotropic, homogeneous body. In practice, engineering materials such as structural steels, titanium alloys and high strength aluminium alloys are multi-phase metals with microstructural length scales that can be the same order of magnitude as the maximum achievable nano-indentation depth. This heterogeneity results in considerable scatter in the indentation load-displacement traces and complicates inverse analysis of this data. To address this problem, an improved and optimised inverse analysis procedure to estimate bulk tensile properties of heterogeneous materials using a new ‘multi-objective’ function has been developed which considers nano-indentation data obtained from several indentation sites. The technique was applied to S355 structural steel bulk samples as well as an autogenously electron beam welded sample where there is a local variation of material properties. Using the new inverse analysis approach on the S355 bulk material resulted in an error within 3% of the experimental yield strength and strain hardening exponent data, which compares to an approximate 9% error in the yield strength and an 8% error in the strain hardening exponent using a more conventional approach to the inverse analysis method. Applying the new method to indentation data from different regions of an S355 steel weld and using this data as an input into an FE model of the cross-weld, tensile data from the FE model resulted matching the experimentally measured properties to within 5%, confirming the efficacy of the new inverse analysis approach.

Item Type: Article
Subjects : Mechanical Engineering Science
Divisions : Faculty of Engineering and Physical Sciences > Mechanical Engineering Sciences
Authors :
NameEmailORCID
De Bono, Damasod.debono@surrey.ac.ukUNSPECIFIED
London, TUNSPECIFIEDUNSPECIFIED
Baker, MarkM.Baker@surrey.ac.ukUNSPECIFIED
Whiting, MarkM.Whiting@surrey.ac.ukUNSPECIFIED
Date : 10 February 2017
Identification Number : 10.1016/j.ijmecsci.2017.02.006
Copyright Disclaimer : © 2017 The Authors. Published by Elsevier Ltd. This is an open access article under the CC BY license (http://creativecommons.org/licenses/BY/4.0/).
Uncontrolled Keywords : Inverse analysis, nano-indentation, FEA, objective function, structural steel, tensile properties, multi-phase material, composite material, elastic-plastic constitutive behaviour.
Related URLs :
Depositing User : Symplectic Elements
Date Deposited : 21 Feb 2017 15:07
Last Modified : 07 Jul 2017 08:21
URI: http://epubs.surrey.ac.uk/id/eprint/813583

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