Evolving fracture patterns: columnar joints, mud cracks and polygonal terrain

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Goehring, L. ORCID: 0000-0002-3858-7295, 2013. Evolving fracture patterns: columnar joints, mud cracks and polygonal terrain. Philosophical Transactions of the Royal Society A: Mathematical, Physical and Engineering Sciences, 371 (2004), p. 20120353. ISSN 1364-503X

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Official URL: http://doi.org/10.1098/rsta.2012.0353

Abstract

When cracks form in a thin contracting layer, they sequentially break the layer into smaller and smaller pieces. A rectilinear crack pattern encodes information about the order of crack formation, as later cracks tend to intersect with earlier cracks at right angles. In a hexagonal pattern, in contrast, the angles between all cracks at a vertex are near 120°. Hexagonal crack patterns are typically seen when a crack network opens and heals repeatedly, in a thin layer, or advances by many intermittent steps into a thick layer. Here, it is shown how both types of pattern can arise from identical forces, and how a rectilinear crack pattern can evolve towards a hexagonal one. Such an evolution is expected when cracks undergo many opening cycles, where the cracks in any cycle are guided by the positions of cracks in the previous cycle but when they can slightly vary their position and order of opening. The general features of this evolution are outlined and compared with a review of the specific patterns of contraction cracks in dried mud, polygonal terrain, columnar joints and eroding gypsum–sand cements.

Item Type:

Journal article

Publication Title:

Philosophical Transactions of the Royal Society A: Mathematical, Physical and Engineering Sciences

Creators:

Goehring, L.

Publisher:

The Royal Society Publishing

Date:

4 November 2013

Volume:

371