Thermodynamic dislocation theory: torsion of bars

TL;DR

This paper applies thermodynamic dislocation theory to analyze torsion in bars, successfully simulating torque-twist behavior of single crystal copper with physics-based parameters.

Contribution

It extends thermodynamic dislocation theory to non-uniform plastic deformation in torsion, providing a physics-based model that matches experimental data.

Findings

Simulated torque-twist curves align with experimental results.

Model parameters are approximately independent of strain rate and temperature.

Effective for analyzing non-uniform plastic deformation in torsion.

Abstract

The thermodynamic dislocation theory developed for non-uniform plastic deformations is used here in an analysis of a bar subjected to torsion. Employing a small set of physics-based parameters, which we expect to be approximately independent of strain rate and temperature, we are able to simulate the torque-twist curve for a bar made of single crystal copper that agrees with the experimental one.