Study on the Performance of Hopkinson Torsion Bar Based on Electromagnetic Drives

This article designs an electromagnetic loading system applied to the Hopkinson torsion bar experimental device, utilizing the principle of electromagnetic induction to drive with electromagnetic force. This can compensate for the poor controllability of loading mechanical peak values in traditional pneumatic drives, allowing for precise control of incident stress waves, and sets up the external circuit for the electromagnetic loading device. By using simulation software to model the electromagnetic Hopkinson torsion bar, the capacitance value remains unchanged while only varying the charging voltage level of the capacitance and conducting simulations, followed by analyzing the shear stress waveform in the simulation results. Finally, through prototype testing, the correctness of the design of the device, the results of formula calculations, and finite element simulation results were verified.