Ti-6Al-4V plastic deformation at low temperatures: a FEM analysis beyond the onset of instability

• Published in: Modelling and simulation in materials science and engineering Vol. 9; no. 4; pp. 259 - 277
• Main Authors: Briottet, L, Ambard, A, Guichard, D
• Format: Journal Article
• Language: English
• Published: IOP Publishing 01.07.2001
• ISSN: 0965-0393; 1361-651X
• DOI: 10.1088/0965-0393/9/4/302

In order to assess the life of Ti-6Al-4V components at 20 K supporting local plastic deformation during nominal loading, it is necessary to quantitatively describe the effect of the induced heat generation. Linear stability analysis is applied to describe the onset of instability for the experimental conditions considered. Then, the thermomechanical coupling is implemented in a finite element code. It is shown that the model properly describes the experimental tensile tests performed at 20 K under helium gas. It is able to restore the main features described in the literature. The model is applied to discuss the development of the heterogeneous pattern of deformation through the specimen at various imposed cross-head velocities. The transition from propagative to random non-propagative localized bands is observed. The proposed finite element model is shown to be a powerful tool to analyse in-service components in the cryogenic range.