The Taylor-Quinney coefficient of tungsten-base heavy alloys
Source abstract
Abstract
Tungsten heavy alloys (WHAs) have been widely investigated due to their high density and strength, thus making them suitable candidates for defense applications, especially those involving high strain rates, such as Kinetic Energy Penetrators (KEP) for armour-piercing fin-stabilized discarding sabot (APFSDS) ammunition. Besides their mechanical properties, the extent of the thermomechanical coupling, i.e., the Taylor-Quinney coefficient (TQC), is relevant for producing accurate numerical models of high strain rate configurations. However, the TQC of WHAs has not been investigated yet. Four different WHA prototypes were evaluated. Changing the content of tungsten from 70 to 92.5 wt% had little effect on the TQC which had an average value of 0.24. Those low TQC values are accompanied by a significant strain-rate sensitivity with minimal strain hardening. Throughout the tests, dynamic shear localization was not observed.
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