Evolution of mud-crack patterns during repeated drying cycles

Goehring, L ORCID: 0000-0002-3858-7295, Conroy, R, Akhter, A, Clegg, WJ and Routh, AF, 2010. Evolution of mud-crack patterns during repeated drying cycles. Soft Matter, 6 (15), pp. 3562-3567. ISSN 1744-683X

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Abstract

In mud, crack patterns are frequently seen with either an approximately rectilinear or hexagonal tiling. Here we show, experimentally, how a desiccation crack pattern changes from being dominated by 90° joint angles, to 120° joint angles. Layers of bentonite clay, a few mm thick, were repeatedly wetted and dried. When dried, the layers crack. These cracks visibly close when rewetted, but a similar crack pattern forms when the layer is redried, with cracks forming along the lines of previously open cracks. Time-lapse photography was used to show how the sequence in which individual cracks open is different in each generation of drying. The geometry of the crack pattern was observed after each of 25 generations of wetting and drying. The angles between cracks were found to approach 120°, with a relaxation time of approximately 4 generations. This was accompanied by a gradual change in the position of the crack vertices, as the crack pattern evolved. A simple model of crack behavior in a layer where the positions of previously open cracks define lines of weakness is developed to explain these observations.

Item Type: Journal article
Publication Title: Soft Matter
Creators: Goehring, L., Conroy, R., Akhter, A., Clegg, W.J. and Routh, A.F.
Publisher: Royal Society of Chemistry
Date: 29 May 2010
Volume: 6
Number: 15
ISSN: 1744-683X
Identifiers:
NumberType
10.1039/B922206EDOI
Divisions: Schools > School of Science and Technology
Depositing User: Jonathan Gallacher
Date Added: 05 Sep 2016 09:28
Last Modified: 09 Jun 2017 14:05
URI: http://irep.ntu.ac.uk/id/eprint/28373

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