Combined effects of high strain rate, elevated temperature, and triaxiality on a commercial tungsten alloy

Cadoni, Ezio and Dotta, Matteo and Forni, Daniele and Riganti, Gianmario (2023) Combined effects of high strain rate, elevated temperature, and triaxiality on a commercial tungsten alloy. Procedia Structural Integrity, 47. pp. 268-273.

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Abstract

In this paper, a commercial tungsten alloy is investigated in dynamic tensile tests with high strain rates and elevated temperatures on smooth and notched specimens. A Split Hopkinson Tensile Bar device, equipped with a water-cooled induction heating system, was used to perform the tests at high strain rates and elevated temperatures on round specimens measuring 2 mm in diameter and 5 mm in gauge. A series of tensile tests were conducted on specimens with three different notches at high strain rates and elevated temperatures to evaluate tensile behaviour in different triaxiality conditions. It has been found that the tensile properties of the tungsten alloy significantly depended on the test temperature and decreased with increasing temperature as well as stress triaxiality significantly affects failure strain. Stress triaxiality, strain-rate sensitivity, and temperature were combined to study this alloy's failure surfaces.

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