Study and validation of a variational theory of thermo-mechanical coupling in finite visco-plasticity

INTERNATIONAL JOURNAL OF SOLIDS AND STRUCTURES

卷:47

Article

Stainier, L.¹  Ortiz, M.² 

[1] Univ Liege, Dept Aerospatiale & Mecan, LTAS MCT, B-4000 Liege, Belgium

[2] CALTECH, Div Engn & Appl Sci, Pasadena, CA 91125 USA

关键词: Finite visco-plasticity;    Thermo-mechanical coupling;    Variational constitutive updates;   

DOI  :  10.1016/j.ijsolstr.2009.11.012

来源: Elsevier

【 摘 要 】

We present an experimental validation of the variational theory of thermo-mechanical coupling of Yang et al. (2006) in the case of finite thermo-visco-plasticity. The variational theory results in precise predictions of the rate of heating due to dissipation and does not require an a priori definition or model of a fraction of plastic work converted to heat. We show that the predicted heat-to-plastic work ratios are in good agreement with experimental observations for 2024-T3 aluminum, alpha-titanium and pure poly-crystalline tantalum, including their evolution with strain and their dependence on strain-rate. We also critically compare the variational theory to other theories and models in the literature. (C) 2009 Elsevier Ltd. All rights reserved.

【 授权许可】

Free