Biaxial deformation behaviour of AZ31 magnesium alloy: Crystal-plasticity-based prediction and experimental validation

INTERNATIONAL JOURNAL OF SOLIDS AND STRUCTURES

卷:49

Article; Proceedings Paper

Steglich, D.¹  Jeong, Y.²  Andar, M. O.³  Kuwabara, T.⁴ 

[1] Helmholtz Zentrum Geesthacht Zentrum Mat & Kusten, Inst Mat Res Mat Mech, D-21502 Geesthacht, Germany

[2] Pohang Univ Sci & Technol, Grad Inst Ferrous Technol, Pohang 790784, Gyeongbuk, South Korea

[3] Tokyo Univ Agr & Technol, Grad Sch Technol, Dept Mech Syst Engn, Koganei, Tokyo 1848588, Japan

[4] Tokyo Univ Agr & Technol, Inst Engn, Div Adv Mech Syst Engn, Koganei, Tokyo 1848588, Japan

关键词: Anisotropy;    Plasticity;    Plastic work;    VPSC;    Biaxial test;    Differential hardening;   

DOI  :  10.1016/j.ijsolstr.2012.06.017

来源: Elsevier

【 摘 要 】

Plastic deformation of the commercial magnesium sheet alloy AZ31 under monotonic loadings was investigated by means of mechanical tests and numerical simulations. In addition to the commonly used uniaxial test two complementary mechanical tests were performed: a biaxial test using cruciform specimens and a hydraulic bulge test. Both tests lead to consistent results and provided evidence for the differential strain hardening character of the considered material. A polycrystalline aggregate was generated from the measured texture data. Simulations using the visco-plastic self-consistent (VPSC) scheme indicated the primary role of pyramidal slip in equibiaxial tension. Contours of equal plastic work have been generated using a methodology based on probing the aggregate in the space of principal strains. The contours were compared with the respective tests. Hardening parameters were fitted in order to capture the initial yield and evolution of iso-work contours. The limitations of the numerical framework's predictive capability as well as the directions for parameter identification of phenomenological yield surfaces were formulated. (C) 2012 Elsevier Ltd. All rights reserved.

【 授权许可】

Free