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Crack-front instability in a confined elastic film
 

Summary: Crack-front instability in a confined
elastic film
BY M. ADDA-BEDIA
1
AND L. MAHADEVAN
2,*
1
Laboratoire de Physique Statistique de l'Ecole Normale Supe´rieure,
24 rue Lhomond, 75231 Paris, France
2
Division of Engineering and Applied Sciences, Harvard University, Pierce Hall,
29 Oxford Street, Cambridge, MA 02138, USA
We study the undulatory instability of a straight crack front generated by peeling a
flexible elastic plate from a thin elastomeric adhesive film. We show that there is a
threshold for the onset of the instability that is dependent on the ratio of two length-
scales that arise naturally in the problem: the thickness of the film and an elastic length
defined by the stiffness of the plate and that of the film. A linear stability analysis
predicts that the wavelength of the instability scales linearly with the film thickness. Our
results are qualitatively and quantitatively consistent with recent experiments, and show
how crack fronts may lose stability due to a competition between bulk and surface effects

  

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

 

Collections: Physics