HAL will be down for maintenance from Friday, June 10 at 4pm through Monday, June 13 at 9am. More information
Skip to Main content Skip to Navigation
Journal articles

Statistical analysis of dislocation dynamics during viscoplastic deformation from acoustic emission

Abstract : We present experimental data of acoustic emission (AE) induced by dislocation motion during "pure" viscoplastic (ductile) deformation of singlecrystals and polycrystals of ice which provide opportunity to revisit collective dislocation dynamics as a critical phenomenon, as recently proposed for brittle fracturing. The data were recorded during compression and torsion creep experiments. AE statistics of power law type were systematically obtained under different experimental conditions. Among the possible candidates for such a system with threshold dynamics exhibiting power law statistics, critical points, disordered first-order transitions, and self-organized criticality should be considered. The revisitation of dislocation dynamics as a critical phenomenon allows rationalization of collective effects as well as of the heterogeneity and complexity of viscoplastic deformation of crystalline materials. Such critical behavior implies that dislocation avalanches and strain localizations are unpredictible, in a deterministic sense, in space, time, and energy domains and that large plastic instabilities account for most of the viscoplastic deformation.
Complete list of metadata

Contributor : Nathalie Pothier Connect in order to contact the contributor
Submitted on : Friday, March 11, 2022 - 5:23:07 PM
Last modification on : Sunday, March 13, 2022 - 3:03:21 AM


Journal of Geophysical Researc...
Publisher files allowed on an open archive






Jérôme Weiss, Franz Lahaie, Jean Robert Grasso. Statistical analysis of dislocation dynamics during viscoplastic deformation from acoustic emission. Journal of Geophysical Research : Solid Earth, American Geophysical Union, 2000, 105, pp.433-442. ⟨10.1029/1999JB900312⟩. ⟨insu-03606320⟩



Record views


Files downloads