On the elasto-viscoplastic behavior of the Ti5553 alloy

MATERIALS SCIENCE AND ENGINEERING A-STRUCTURAL MATERIALS PROPERTIES MICROSTRUCTURE AND PROCESSING

卷:617

Article

Ben Bettaieb, Mohamed¹  Van Hoof, Thibaut²  Pardoen, Thomas⁴  Dufour, Philippe⁴  Lenain, Astrid⁵  Jacques, Pascal J.⁴  Habraken, Anne Marie^1,3 

[1] Univ Liege, Div MS2F, Dept ArGEnCo, B-4000 Liege, Belgium

[2] CENAERO Ctr Rech Aeronaut, B-6041 Gosselies, Belgium

[3] FNRS Fond Natl Rech Sci, Brussels, Belgium

[4] Catholic Univ Louvain, Inst Mech Mat & Civil Engn, B-1348 Louvain, Belgium

[5] Techspace Aero DT Mat & Proc, B-04041 Milmort, Belgium

关键词: Ti5553 alloy;    Ti-6Al-4V alloy;    Norton Hoff model;    Viscoplasticity;    Anisotropy;    FE simulations;   

DOI  :  10.1016/j.msea.2014.08.055

来源: Elsevier

【 摘 要 】

The elastoviscoplastic behavior of the Ti5553 alloy is characterized and compared to the classical Ti-6Al-4V alloy. The true stress-strain curves are determined based on tensile tests performed under different strain rates at room temperature and at 150 degrees C, from which the elastic constants and the parameters of a Norton-Hoff viscoplastic model are identified. The strength of the Ti5553 alloy is 20-40% higher than the strength of the Ti-6Al-4V alloy. The Ti5553 alloy constitutes thus a promising candidate for advanced structural applications. In view of modeling structural applications of forming operations, the elastic and plastic initial anisotropy of the two alloys is investigated by combining compression on cylinders with elliptical sections, uniaxial tensile tests in different material directions, plane strain and shear tests. The initial anisotropy of the different alloys is very weak which justifies the modeling of the mechanical behavior with an isotropic yield surface. The identified elastoviscoplastic model is validated by comparing experimental results with FE predictions both on cylindrical notched specimens subjected to tensile tests and on flat specimens subjected to plane strain conditions. (C) 2014 Elsevier B.V. All rights reserved.

【 授权许可】

Free