A constitutive model for a rate and temperature-dependent, plastically anisotropic titanium alloy

Miguel Ruiz de Sotto (1) , Patrice Longère (1) , Véronique Doquet (2) , Jessica Papasidero (3)

1 ICA - Institut Clément Ader
2 LMS - Laboratoire de mécanique des solides
3 Safran Aircraft Engines

Aircraft engine fan blades are notably designed to withstand impact loading involving large deformation, high strain rate, non-proportional loading paths and self-heating. Due to their high strength-to-weight ratio and good toughness, Ti–6Al–4V titanium alloys are promising candidates for the blades leading edge. An extensive experimental campaign on a Ti–6Al–4V titanium alloy provided in the form of cold rolled plates has been carried out. The thermo-mechanical characterization consisted in tension, compression and shear tests performed at various strain rates and temperatures, and under monotonic as well as alternate loading paths. A constitutive model has been accordingly developed accounting for the combined effect of plastic orthotropy and tension/compression asymmetry, nonlinear isotropic and kinematic strain hardening, strain rate hardening, and thermal softening. The constitutive model has been implemented as a user material subroutine into the commercial finite element computation code LS-DYNA. The performances of the model have been estimated by conducting numerical simulations considering a volume element under various loading paths as well as the specimens used for the experimental campaign.

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

Miguel Ruiz de Sotto, Patrice Longère, Véronique Doquet, Jessica Papasidero. A constitutive model for a rate and temperature-dependent, plastically anisotropic titanium alloy. International Journal of Plasticity, 2020, pp.102777. ⟨10.1016/j.ijplas.2020.102777⟩. ⟨hal-02862490⟩