Plasticity and fracture in drying colloidal films

Goehring, L. ORCID: 0000-0002-3858-7295, Clegg, W.J. and Routh, A.F., 2013. Plasticity and fracture in drying colloidal films. Physical Review Letters, 110, 024301. ISSN 0031-9007

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Cracks in drying colloidal dispersions are typically modeled by elastic fracture mechanics, which assumes that all strains are linear, elastic, and reversible. We tested this assumption in films of a hard latex, by intermittently blocking evaporation over a drying film, thereby relieving the film stress. Here we show that although the deformation around a crack tip has some features of brittle fracture, only 20%-30% of the crack opening is relieved when it is unloaded. Atomic force micrographs of crack tips also show evidence of plastic deformation, such as microcracks and particle rearrangement. Finally, we present a simple scaling argument showing that the yield stress of a drying colloidal film is generally comparable to its maximum capillary pressure, and thus that the plastic strain around a crack will normally be significant. This also suggests that a film’s fracture toughness may be increased by decreasing the interparticle adhesion.

Item Type: Journal article
Publication Title: Physical Review Letters
Creators: Goehring, L., Clegg, W.J. and Routh, A.F.
Publisher: American Physical Society
Date: 7 January 2013
Volume: 110
ISSN: 0031-9007
Divisions: Schools > School of Science and Technology
Record created by: Jonathan Gallacher
Date Added: 05 Sep 2016 07:49
Last Modified: 18 Oct 2017 13:17

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