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Morphologies resulting from the directional propagation of fractures L. Pauchard,1,

Summary: Morphologies resulting from the directional propagation of fractures
L. Pauchard,1,
* M. Adda-Bedia,2
C. Allain1
and Y. Couder2
FAST, Ba^timent 502, Campus Universitaire d'Orsay, 91405 Orsay Cedex, France
Laboratoire de Physique Statistique, E´cole Normale Supe´rieure, 24 Rue Lhomond, 75231 Paris Cedex 05, France
Received 3 July 2002; revised manuscript received 13 December 2002; published 26 February 2003
When growing in a stress gradient, cracks have a directional growth. We investigate here this type of
instability in the case of a colloidal gel deposited on a substrate and left to dry. The use of various materials
reveals the existence of two distinct types of dynamics. When the crack nucleation is easy a well known
situation is reached: an array of periodic fractures forms, which grow parallel to each other and move quasi-
statically with the stressed region. In contrast, in materials where the crack nucleation is difficult, a subcritical
process is observed with the retarded formation of isolated cracks which move faster and which display an arch
shaped trajectory. This type of process appears to be generic in all cases where there is delayed nucleation. This
is confirmed by experiments on the directional propagation of cracks in thermally stressed glass.
DOI: 10.1103/PhysRevE.67.027103 PACS number s : 62.20.Mk, 47.54. r, 81.40.Np, 82.70.Dd
Many morphological instabilities due to growth in opened


Source: Adda-Bedia, Mokhtar - Laboratoire de Physique Statistique, Département de Physique, École Normale Supérieure


Collections: Physics