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

JOURNAL OF ALLOYS AND COMPOUNDS

卷:586

Article

Brest, J. S.^1,2  Keryvin, V.¹  Longere, P.²  Yokoyama, Y.³ 

[1] Univ Bretagne Sud, Univ Europeenne Bretagne, LIMATB EA 4250, F-56321 Lorient, France

[2] Univ Toulouse, Inst Super Aeronaut & Espace, ICA EA 814, F-31055 Toulouse 4, France

[3] Tohoku Univ, Adv Mat Lab, IMR, Aoba Ku, Sendai, Miyagi 9808577, Japan

关键词: Metallic glasses;    Diametral compression;    Digital image correlation;    Finite element modelling;    Plasticity;    Shear bands;   

DOI  :  10.1016/j.jallcom.2013.02.041

来源: Elsevier

【 摘 要 】

Multiaxial and heterogeneous mechanical experiments, by means of the diametral compression test (Brazilian test), were carried out on Zr-based Bulk Metallic Glass. Attention 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. (C) 2013 Elsevier B. V. All rights reserved.

【 授权许可】

Free