Eventos Anais de eventos
COBEM 2021
26th International Congress of Mechanical Engineering
On the influence of the Lode angle on the pseudo-elastic behavior of Ni-Ti alloys under multiaxial loading programs
Submission Author:
Stefan Viggiano , DF
Co-Authors:
Stefan Viggiano, Edgar Mamiya
Presenter: Stefan Viggiano
doi://10.26678/ABCM.COBEM2021.COB2021-1048
Abstract
The Souza-Auricchio model pioneered in the description of pseudo-elastic and shape memory behaviors within the setting of three-dimensional media, and it is currently available in commercial level simulation tools. Nevertheless, the correlation between the stress-strain curves produced by the model and the experimental observation is still far from satisfactory. Within this setting, the influence of the Lode angle on the pseudo-elastic behavior of Ni-Ti alloys under multiaxial loading programs is addressed in this paper. The new mechanical model incorporates the third invariant of the deviatoric stress and the volume fraction of the detwinned martensitic phase on the material parameters -- elastic modulus, hardening modulus and saturation strain -- proposed in the three-dimensional model originally developed by Souza et al. (1998). The resulting model exhibits significantly better correlation with experimental observations reported in the literature, under axial, shear and combined axial-shear loading programs.
Keywords
shape memory effect, pseudo-elasticity
