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Technical Briefs

The Shear Response of a Thin Aluminum Layer

[+] Author and Article Information
V. L. Tagarielli

Department of Engineering, Cambridge University, Trumpington Street, Cambridge, CB2 1PZ, UK

N. A. Fleck1

Department of Engineering, Cambridge University, Trumpington Street, Cambridge, CB2 1PZ, UKnaf1@eng.cam.ac.uk

Supplied by Goodfellow Cambridge Ltd., Huntingdon PE29 6WR, UK.

Obtained from Crystran Ltd., Dorset BH12 4PA, UK.

The elastic shear stiffness of the aluminum specimens much exceeds the stiffness of the loading system.

1

Corresponding author.

J. Appl. Mech 78(1), 014505 (Oct 20, 2010) (3 pages) doi:10.1115/1.4002210 History: Received February 16, 2010; Revised April 09, 2010; Posted July 23, 2010; Published October 20, 2010; Online October 20, 2010

Aluminum layers, 1050μm thick, have been diffusion bonded to alumina blocks and subjected to simple shear in order to determine the sensitivity of shear stress versus strain response to layer thickness. No significant thickness effect on strength is observed and reversed loading tests indicate isotropic hardening. Final failure in shear is by microvoid coalescence within the sandwich layer with a void spacing comparable to the layer thickness. The significance of the results for strain gradient plasticity theory is discussed.

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Figures

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Figure 1

(a) Test specimen, comprising three aluminum foil disks sandwiched between two alumina plates and (b) setup for the monotonic and reversed shear testing of the aluminum thin films

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Figure 2

Shear stress versus plastic shear strain response for aluminum foil samples

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Figure 3

Measured shear yield stress and shear flow stress at a plastic shear strain of 0.5, as a function of the height of the aluminum thin film specimens

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Figure 4

Typical shear stress versus plastic shear strain for a 50 μm thick aluminum thin film specimen subject to reversed plastic straining. The response of a nominally identical specimen to monotonic shearing is included for the purpose of comparison.

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