Plasticity and fracture in drying colloidal films

Goehring, L ORCID: https://orcid.org/0000-0002-3858-7295, Clegg, WJ and Routh, AF, 2013. Plasticity and fracture in drying colloidal films. Physical Review Letters, 110, 024301. ISSN 0031-9007

Preview

Text 5910_Goehring.pdf - Published version Download (1MB) | Preview

Abstract

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
Identifiers:	Number Type 10.1103/PhysRevLett.110.024301 DOI
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
URI:	https://irep.ntu.ac.uk/id/eprint/28369

Actions (login required)

Edit View

Statistics

Views

Downloads