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Crack front dynamics across a single heterogeneity A. Prevost,

Summary: Crack front dynamics across a single heterogeneity
J. Chopin,
A. Prevost,
A. Boudaoud,
and M. Adda-Bedia
Laboratoire de Physique Statistique, Ecole Normale Sup´erieure, UPMC Paris 06,
Universit´e Paris Diderot, CNRS, 24 rue Lhomond, 75005 Paris, France
(Dated: January 23, 2011)
We study the spatiotemporal dynamics of a crack front propagating at the interface between a
rigid substrate and an elastomer. We first characterize the rheology of the front when the substrate
is homogeneous and find that the equation of motion is intrinsically nonlinear. We then pattern
the substrate with a single defect and vary its size and strength. Steady profiles of the front are
well-described by a standard linear theory with nonlocal elasticity, except close to a strong defect.
In contrast, this theory seems to fail in dynamical situations, i.e. when the front relaxes to its steady
shape, or when the front pinches off after detachment from a defect. More generally, these results
may impact the current understanding of crack fronts in heterogeneous media.
PACS numbers: 46.50.+a,82.35.Gh,81.65.Cf
Understanding the fundamental problem of how ma-
terials break or debond from a substrate is of great im-
portance for a wide range of applications. It has been


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


Collections: Physics