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A combined experimental and finite element approach for determining mechanical properties of aluminium alloys by nanoindentation

Khan, M. K.; Hainsworth, S. V.; Fitzpatrick, M. E. and Edwards, L. (2010). A combined experimental and finite element approach for determining mechanical properties of aluminium alloys by nanoindentation. Computational Materials Science, 49(4) pp. 751–760.

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Aluminium alloys for the aerospace industry are often clad by roll-bonded aluminium to improve corrosion resistance. The clad layer is of the order of 100 μm in thickness and it is difficult to determine the mechanical properties of this layer by conventional mechanical testing techniques. Nanoindentation is ideally suited to determining the elastic and plastic properties of such layers and here we report on a combined approach using experimental nanoindentation and finite element analysis to extract yield stress and strain hardening exponent for an Al-clad system. The approach used was calibrated against results for an Al 2024-T351 alloy, where conventional mechanical testing data was available. For the Al 2024-T351, a forward analysis was used for extraction of load–displacement curves at different indentation depths with the help of elastic–plastic properties obtained from tensile testing. For a 100 μm clad layer of pure aluminium on Al 2024-T351, reverse analysis was used for extraction of elastic–plastic properties from a single indentation test. A yield stress of 110–120 MPa and a value of 0.075–0.1 for the work hardening exponent was obtained for the Al cladding. Nanoindentation properties including maximum load of indentation, contact depth, area of contact and pile-up obtained from the forward and reverse analyses showed excellent agreement with the experimental results.

Item Type: Journal Article
Copyright Holders: 2010 Elsevier B.V.
ISSN: 0927-0256
Project Funding Details:
Funded Project NameProject IDFunding Body
Not SetNot SetAirbus Deutschland
Not SetNot SetThe Lloyd’s Register Educational Trust
Keywords: aluminium alloys; nanoindentation; plasticity; forward and reverse analysis
Academic Unit/Department: Mathematics, Computing and Technology > Engineering & Innovation
Mathematics, Computing and Technology
Item ID: 22415
Depositing User: Michael E. Fitzpatrick
Date Deposited: 28 Jul 2010 12:49
Last Modified: 20 Jan 2016 10:07
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