Insight into plasticity mechanisms in metallic glasses by means of a Brazilian test and numerical simulation

Jean-Sébastien Brest (1) , Vincent Keryvin (2) , Patrice Longère (3) , Yoshihiko Yokoyama (4)

1 ECOMATH
2 LIMATB - Laboratoire d'Ingénierie des Matériaux de Bretagne
3 ICA - Institut Clément Ader
4 IMR - Institute for Materials research

Multiaxial and heterogeneous mechanical experiments, by means of the diametral com- pression test (Brazilian test), were carried out on Zr-based Bulk Metallic Glass. Atten- tion was notably focused on obtaining the displacement field in the area of interest (large strains) employing a Digital Image Correlation device, in addition to the measurement of the usual global load-displacement curve. In order to reproduce the behaviour of the BMG at stake, several constitutive equations were considered with growing complexity: von Mises, Drucker-Prager (pressure dependence), free volume based model as well as a viscoplastic Coulomb-Mohr type model. The two latter were implemented as user-material in a Finite Element computation code. The results of these investigations including experiments and computational simulations are discussed.

Mots clés: Metallicglasses; Diametralcompression; Plasticity; Shear bands; Constitutive models; Finite Element Modelling; DigitalImageCorrelation

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

Jean-Sébastien Brest, Vincent Keryvin, Patrice Longère, Yoshihiko Yokoyama. Insight into plasticity mechanisms in metallic glasses by means of a Brazilian test and numerical simulation. Journal of Alloys and Compounds, 2014, 586, pp.S236-S241. ⟨hal-00977285⟩