In elastic–plastic finite deformation problems constitutive relations are commonly formulated in terms the Cauchy stress as a function of the elastic finger tensor and an objective rate of the Cauchy stress as a function of the rate of deformation tensor. For isotropic materials models this is rather straight forward, but for anisotropic material models, including elastic anisotropy as well as plastic anisotropy, this may lead to confusing formulations. It will be shown that it is more convenient to define the constitutive relations in terms of invariant tensors referred to the deformed metric. An alternative decomposition of the deformation tensor is introduced that can easily be linked to the additive decomposition of the velocity gradient into a spin tensor and a rate of deformation tensor. Constraints for constitutive equations are formulated based on thermodynamics.
|Number of pages||4|
|Publication status||Published - 2006|
|Event||9th International ESAFORM Conference on Material Forming 2006 - Glasgow, United Kingdom|
Duration: 26 Apr 2006 → 28 Apr 2006
Conference number: 9
|Conference||9th International ESAFORM Conference on Material Forming 2006|
|Abbreviated title||ESAFORM 2006|
|Period||26/04/06 → 28/04/06|
Huetink, H. (2006). On Anisotropy, Objectivity and Invariancy in finite thermo–mechanical deformations. 355-358. Paper presented at 9th International ESAFORM Conference on Material Forming 2006, Glasgow, United Kingdom.