Kinematical and thermal fields observations associated with the Portevin Le Châtelier effect on an Al-Mg alloy

Hervé Louche (1) , K. Bouabdallah (1) , Pierre Vacher (1) , T. Coudert (1) , P. Balland (1)

1 SYMME - Laboratoire SYstèmes et Matériaux pour la MEcatronique

This paper presents experimental tensile test results obtained on flat aluminum magnesium alloy samples on a hard machine. The mechanical response, kinematic fields and acoustic emissions were simultaneously obtained in an experimental setup. Propagation instabilities associated with the Portevin-Le-Châtelier effect were observed as localized intense strain increment bands. Depending on the strain rate, A, B or C types were studied on the basis of stress drops, acoustic emission and strain fields. Then the band characteristics (position, orientation, width, thickness reduction, intensity, acoustic emission, principal strain direction) were presented in various strain rate conditions.

Mots clés: Strain field measurement; Acoustic emission; Strain localization; Aluminum magnesium alloy; Portevin-Le-Châtelier effect

Domaines: Mécanique des matériaux [physics.class-ph]

Hervé Louche, K. Bouabdallah, Pierre Vacher, T. Coudert, P. Balland. Kinematical and thermal fields observations associated with the Portevin Le Châtelier effect on an Al-Mg alloy. ASME Applied Mechanics and Materials Conference, Jun 2007, Austin, United States. ⟨10.1007/s11340-008-9125-5⟩. ⟨hal-00343943⟩