A new intermediate model for polycrystalline viscoplastic deformation and texture evolution

✍ Scribed by Said Ahzi; Siham M’Guil

• Publisher: Elsevier Science
• Year: 2008
• Tongue: English
• Weight: 731 KB
• Volume: 56
• Category: Article
• ISSN: 1359-6454
• DOI: 10.1016/j.actamat.2008.07.007

✦ Synopsis

In this paper, we propose a model for large viscoplastic deformation of polycrystalline materials called /-model. The proposed interaction law is based on a new non-linear intermediate approach. In this formulation, we propose to minimize an error function which combines the deviations of the local fields from the corresponding macroscopic ones. A scalar weight parameter was introduced to span the entire solution domain between the upper and lower bound approaches. We applied this approach to predict the stress-strain response and texture evolution in face-centered cubic metals under tension, compression and plane strain compression. We analyzed the effect of the weight parameter in terms of slip activity, stress-strain responses and texture transitions such as copper-type vs. brass-type textures. A comparison between the self-consistent model (VPSC code) and the /-model is also performed in this paper. Some possible links between the / parameter and microstructural features are also discussed.