HAL : hal-00701935, version 1

arXiv : 1205.6197

DOI : 10.1103/PhysRevE.83.046108

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Physical Review E (2011) 62.20.mt, 46.50.+a, 68.35.Ct

Local dynamics of a randomly pinned crack front during creep and forced propagation: An experimental study

Ken Tore Tallakstad 1, 2, Renaud Toussaint 3, 4, Stéphane Santucci 5, Jean Schmittbuhl 3, Knut Jørgen Måløy 1, 2

(14/04/2011)

We have studied the propagation of a crack front along the heterogeneous weak plane of a transparent poly(methyl methacrylate) (PMMA) block using two different loading conditions: imposed constant velocity and creep relaxation. We have focused on the intermittent local dynamics of the fracture front for a wide range of average crack front propagation velocities spanning over four decades. We computed the local velocity fluctuations along the fracture front. Two regimes are emphasized: a depinning regime of high velocity clusters defined as avalanches and a pinning regime of very low-velocity creeping lines. The scaling properties of the avalanches and pinning lines (size and spatial extent) are found to be independent of the loading conditions and of the average crack front velocity. The distribution of local fluctuations of the crack front velocity are related to the observed avalanche size distribution. Space-time correlations of the local velocities show a simple diffusion growth behavior.

1 :	Department of Physics
	University of Oslo
2 :	Fysisk Institutt
	University of Oslo
3 :	Institut de physique du globe de Strasbourg (IPGS)
	CNRS : UMR7516 – INSU – Université de Strasbourg
4 :	Centre for Advanced Study at the Norwegian Academy of Science and Letters
	Norwegian Academy of Science and Letters
5 :	Laboratoire de Physique de l'ENS Lyon (Phys-ENS)
	CNRS : UMR5672 – École Normale Supérieure - Lyon

Équipe de recherche : GE Sismologie

Domaine

:

Physique/Mécanique/Mécanique des matériaux Sciences de l'ingénieur/Mécanique/Mécanique des matériaux Sciences de l'ingénieur/Matériaux

Mots Clés : Fracture – pinning – depinning – avalanches – scaling

hal-00701935, version 1

http://hal.archives-ouvertes.fr/hal-00701935

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Contributeur : Renaud Toussaint <>

Soumis le : Lundi 28 Mai 2012, 12:08:04

Dernière modification le : Lundi 6 Mai 2013, 17:27:01