Thermomechanical conversion in metals: dislocation plasticity model evaluation of the Taylor-Quinney coefficient
Autor: | Curt A. Bronkhorst, Charles K. C. Lieou |
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Rok vydání: | 2020 |
Předmět: |
Convection
Work (thermodynamics) Materials science Polymers and Plastics Thermodynamics FOS: Physical sciences 02 engineering and technology Applied Physics (physics.app-ph) Plasticity 01 natural sciences 0103 physical sciences Thermal Mesoscale and Nanoscale Physics (cond-mat.mes-hall) Condensed Matter - Statistical Mechanics 010302 applied physics Condensed Matter - Materials Science Condensed Matter - Mesoscale and Nanoscale Physics Statistical Mechanics (cond-mat.stat-mech) business.industry Metals and Alloys Materials Science (cond-mat.mtrl-sci) Physics - Applied Physics Function (mathematics) Effective temperature 021001 nanoscience & nanotechnology Electronic Optical and Magnetic Materials Ceramics and Composites Dislocation 0210 nano-technology business Thermal energy |
DOI: | 10.48550/arxiv.2007.04270 |
Popis: | Using a partitioned-energy thermodynamic framework which assigns energy to that of atomic configurational stored energy of cold work and kinetic-vibrational, we derive an important constraint on the Taylor-Quinney coefficient, which quantifies the fraction of plastic work that is converted into heat during plastic deformation. Associated with the two energy contributions are two separate temperatures -- the ordinary temperature for the thermal energy and the effective temperature for the configurational energy. We show that the Taylor-Quinney coefficient is a function of the thermodynamically defined effective temperature that measures the atomic configurational disorder in the material. Finite-element analysis of recently published experiments on the aluminum alloy 6016-T4 \citep{neto_2020}, using the thermodynamic dislocation theory (TDT), shows good agreement between theory and experiment for both stress-strain behavior and temporal evolution of the temperature. The simulations include both conductive and convective thermal energy loss during the experiments, and significant thermal gradients exist within the simulation results. Computed values of the differential Taylor-Quinney coefficient are also presented and suggest a value which differs between materials and increases with increasing strain. |
Databáze: | OpenAIRE |
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