Anisotropy and tension-compression asymmetry modeling of the room temperature plastic response of Ti-6A1-4V

[en] The mechanical behavior of the alloy Ti-6A1-4V is characterized using uniaxial tension, uniaxial compression, simple shear and place strain tests in three orthogonal material directions. The experimental results reveal tension/compression asymmetry, anisotropic yielding and anisotropic strain-hardening. These features are incorporated into an elasto-plastic constitutive law based on the macroscopic orthotropic yield criterion "CPB06" adapted to hexagonal metals. A new identification method for the yield criterion parameters is proposed by inverse modeling of the axial strain field compression specimens in the three orthogonal directions of the material. The sensitivity of different sets of material parameters to the identification method is also analysed and the capacity of the model to accurately predict the forces and displacement field is discussed. A validation of the best set of identified CPB06material parameters is performed by comparing the load-displacement curves in different loading directions for tensile tests on notched round bars with different levels of stress triaxiality and for compression tests on elliptical cross-section specimens, both tests involving multiaxial strain fields and large deformations.

Disciplines :

Materials science & engineering

Author, co-author :

Tuninetti, Victor

Gilles, Gaëtan ; Université de Liège - ULiège > Département ArGEnCo > Département Argenco : Secteur MS2F

Pardoen, Thomas

Habraken, Anne ; Université de Liège - ULiège > Département ArGEnCo > Département ArGEnCo

Language :

English

Title :

Anisotropy and tension-compression asymmetry modeling of the room temperature plastic response of Ti-6A1-4V

Publication date :

April 2015

Journal title :

International Journal of Plasticity

ISSN :

0749-6419

Publisher :

Pergamon Press - An Imprint of Elsevier Science, Oxford, United Kingdom

Volume :

Pages :

53-68

Peer reviewed :

Peer Reviewed verified by ORBi

Available on ORBi :

since 20 November 2014

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Scopus citations^®

112

Scopus citations^®
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OpenCitations

OpenAlex citations

117

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