3D FEM model for Hopkinson Split Torsional (Kolsky) Bar experimental technique

Abstract

In this paper, a 3D FEM model for Hopkinson Split Torsional (Kolsky) Bar experimental technique was made, in order to study the mechanical behavior of some high entropy alloys (HEA). A virtual model of the TSHB system, composed of two collinear bars of 2 m length and 25 mm diameter, one incident and the other transmitted was made, between which the cylindrical, short, thin-walled test specimen is arranged, having hexagonal ends for clamping in the practiced recesses in the two bars. The incident bar is uniformly loaded over a length of 600 mm by rotating its free end and applying a clamp in the section of the bar that delimits the loading zone from the free one. Shear stress values are recorded using virtual sensors placed on the incident and receiver bars, symmetrical to the specimen. The simulation was performed using the Ls-Dyna program.