Work hardening of soft glassy materials, or a metallurgist’s view of peanut butter

Romaric R. R. Vincent; Peter Schurtenberger

doi:10.1039/C0SM01256D

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Soft Matter

Issue 5, 2011

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Work hardening of soft glassy materials, or a metallurgist’s view of peanut butter

Romaric R. R. Vincent and Peter Schurtenberger

Soft Matter, 2011, 7, 1635-1637

DOI: 10.1039/C0SM01256D
Received 04 Nov 2010, Accepted 14 Dec 2010
First published on the web 14 Jan 2011

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The non-linear rheology of colloidal gels, glasses, and pastes is rather complex. For instance, colloidal glasses and pastes yield at a certain strain, followed by shear thinning. A detailed understanding of the yielding point, and what causes it, is lacking. Here, we perform constant shear rate rheology on a pre-sheared material, smooth peanut butter, which is a glassy colloidal paste. Controlling the ageing appears to control the yield stress value, whose associated stress scales with the applied pre-shear with a power law of 1/2. This corresponds to the governing formula for the work hardening mechanism in metals, from which an analogy is drawn.

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