The importance of determining the specimen temperature at varying strains and strain rates during the twisting of a torsion specimen is emphasized and it is argued that previous analyses are inadequate. A three-dimensional finite-diflerence model is developed and a method of obtaining an ‘average’ temperature rise is presented. It is shown that significant temperature profiles are set up during torsion testing and that axial conduction cannot be assumed to be zero. The assumption of a laminar boundary layer is acceptable. Results are presented for two aluminium alloys.
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