Abstract
In thermomechanics, the Taylor–Quinney coefficient specifies fraction of plastic work converted to heat. We challenge the nearly century-long interpretation. We postulate that some fraction of energy delivered to the plastically deformed material is responsible for readjustments of deformation pathways making the plastic flow a kinematically admissible process. The rerouting triggers mesoscale dynamic excitations and activates plasticity-induced heat. Another part of the energy is stored in lattice, while the rest of it contributes to the development of dislocation structures. According to this interpretation, plastic work is not converted to heat, but increases probability of the microstructural adaptiveness and, in this manner, contributes to configurational entropy of the system.
Highlights
In nineteenth century, experiments conducted by Tresca showed that metals subjected to large plastic deformation experience noticeable heating
The macroscopically measured plastic workW p = ∫ σ: dH pe is not converted to heat and, instead, Wp increases probability of occurrence of kinematically admissible dislocation structures making the plastic flow a thermodynamically optimal process
We suggest that plastic work increases configurational entropy of the system[11,12], while plasticity-induced heating quantifies efficiency of the process
Summary
Experiments conducted by Tresca showed that metals subjected to large plastic deformation experience noticeable heating. Taylor and Quinney calculated efficiency of the process and arrived to the conclusion that about 90% of plastic work is turned into heat They determined that a plastically deformed metal stores small portion of plastic work, thereby raises its internal energy[1,2,3,4]. The externally supplied energy is partly stored in the lattice, is utilized to do plastic work, while the excitations consume the remaining portion of the energy In this scenario, the macroscopically measured plastic workW p = ∫ σ: dH pe is not converted to heat and, instead, Wp increases probability of occurrence of kinematically admissible dislocation structures making the plastic flow a thermodynamically optimal process. We suggest that plastic work increases configurational entropy of the system[11,12], while plasticity-induced heating quantifies efficiency of the process
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