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Crack Front Dynamics across a Single Heterogeneity J. Chopin, A. Prevost, A. Boudaoud, and M. Adda-Bedia
 

Summary: Crack Front Dynamics across a Single Heterogeneity
J. Chopin, A. Prevost, A. Boudaoud, and M. Adda-Bedia
Laboratoire de Physique Statistique, Ecole Normale Supe´rieure, UPMC Paris 06, Universite´ Paris Diderot,
CNRS, 24 rue Lhomond, 75005 Paris, France
(Received 25 January 2011; published 26 September 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 kinematics 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. Steady profiles of the front are well described by a standard linear theory with
nonlocal elasticity, except for large slopes of the front. 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.
DOI: 10.1103/PhysRevLett.107.144301 PACS numbers: 46.50.+a, 81.65.Cf, 82.35.Gh
Understanding the fundamental problem of how materi-
als break or debond from a substrate is of great importance
for a wide range of applications. It has been recognized that
rupture processes are highly dependent on microstructures
like impurities, voids, grain boundaries or fibers which can
make the material either weaker or tougher [1]. Whereas

  

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

 

Collections: Physics