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Thermomechanical theory of large deformation plasticity representing tantalum and a quenched and tempered low-carbon steel
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DOI：10.1016/j.ijplas.2026.104773.png)
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Abstract
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This study advances an isotropic thermomechanical elastoplasticity theory to model the large deformation behavior of tantalum and a quenched and tempered low carbon steel across a wide range of temperatures and strain rates. The theory uses a consistent thermodynamic framework to partition all plastic power into configurational and thermal subsystems. Dislocation glide is assumed to occur by thermally activated dislocation motion for the strain rates of 0.001 to 3500 s–1 considered. Thermal boundaries and heat fluxes are considered for the slower non-adiabatic loading conditions to better estimate the relative fractions of thermal and configurational stored power. This work introduces additional temperature and strain rate dependence into the non-equilibrium steady state values of the configurational defects. Uniaxial compression experiments were conducted measuring stress, temperature, and dislocation density as a function of strain to provide a comprehensive experimental characterization of the quenched and tempered low carbon steel. For tantalum, experimental data was gathered from the literature. Numerical results show good agreement with the deformation behavior for both metals. Validation simulations were also conducted after the material parameter evaluations to test the predictive ability of the theory on unseen experimental conditions. The proposed theory performed well in representing the new and existing thermomechanical experimental results.
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