title: Fluctuations of global energy release and crackling in nominally brittle heterogeneous fracture.
abstract: The temporal evolution of mechanical energy and spatially averaged crack speed are both monitored in slowly fracturing artificial rocks. Both signals display an irregular burstlike dynamics, with power-law distributed fluctuations spanning a broad range of scales. Yet, the elastic power released at each time step is proportional to the global velocity all along the process, which enables defining a material-constant fracture energy. We characterize the intermittent dynamics by computing the burst statistics. This latter displays the scale-free features signature of crackling dynamics, in qualitative but not quantitative agreement with the depinning interface models derived for fracture problems. The possible sources of discrepancies are pointed out and discussed.
authors.affiliation: Laboratoire SPHYNX, Service de Physique de l'Etat Condensé, IRAMIS, CEA Saclay, CNRS UMR 3680, 91191 Gif-sur-Yvette, France.
authors.forename: J
authors.initials: J
authors.lastname: Barés
authors.affiliation: Laboratoire SPHYNX, Service de Physique de l'Etat Condensé, IRAMIS, CEA Saclay, CNRS UMR 3680, 91191 Gif-sur-Yvette, France.
authors.forename: M L
authors.initials: ML
authors.lastname: Hattali
authors.affiliation: Unité Mixte CNRS/Saint-Gobain, Surface du Verre et Interfaces, 39 Quai Lucien Lefranc, 93303 Aubervilliers cedex, France.
authors.forename: D
authors.initials: D
authors.lastname: Dalmas
authors.affiliation: Laboratoire SPHYNX, Service de Physique de l'Etat Condensé, IRAMIS, CEA Saclay, CNRS UMR 3680, 91191 Gif-sur-Yvette, France.
authors.forename: D
authors.initials: D
authors.lastname: Bonamy