Thermal softening during high-temperature torsional deformation of aluminum bars

Thermal softening during high-temperature torsional deformation of aluminum bars

A simple extension of the thermodynamic dislocation theory to non-uniform plastic deformations is proposed for an analysis of high-temperature torsion of aluminum bars. Employing a small set of physics-based parameters, which we expect to be approximately independent of strain rate and temperature,...

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Bibliographic Details
Published in:International journal of engineering science Vol. 137; pp. 1 - 7
Main Authors: Le, K.C., Piao, Y.
Format: Journal Article
Language:English
Published: Oxford Elsevier Ltd 01-04-2019
Elsevier BV
Subjects:
Aluminum
Ambient temperature
Bar
Deformation
Dislocations
High temperature
Parameter estimation
Softening
Strain rate
Temperature effects
Thermal softening
Torsion
Thermal softening
Bar
Aluminum
Torsion
Dislocations
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Summary:A simple extension of the thermodynamic dislocation theory to non-uniform plastic deformations is proposed for an analysis of high-temperature torsion of aluminum bars. Employing a small set of physics-based parameters, which we expect to be approximately independent of strain rate and temperature, we are able to fit experimental torque-twist curves for five different twist rates and at one fixed ambient temperature. We find that thermal softening due to temperature rise is significant at high twist rates.
ISSN:0020-7225
1879-2197
DOI:10.1016/j.ijengsci.2018.12.004