Design and Experiment of Split Hopkinson Bar Based on Electromagnetic Loading System

An electromagnetic loading system is designed to be applied to a separate Hop-kinson rod experimental device, It can overcome the shortcomings of traditional pneumatic drive and achieve the purpose of accurately controlling the incident stress. The low-voltage loading method is selected after the investigation of electromagnetic loading technology, then the system equivalent RLC loop is constructed, and the function relationship between the loop parameters and the incident stress wave is derived. Combining theoretical calculation results, using finite element software for coupling field simulation, and the simulation found that the number of turns of the discharge coil has a greater impact on the pulse width and amplitude of the incident stress. At the same time, in order to ensure the utilization efficiency of electromagnetic energy, it is necessary to ensure that the thickness of the inductive coil is greater than the depth of magnetic penetration. Finally, the parameters of the electromagnetic loading system is derived according to the experimental requirements. In this paper, according to the parameters of the electromagnetic loading system, the experimental platform is built to carry out the Hopkinson bar impact experiment. Through the measurement of the incident stress wave, the correctness of the theoretical calculation and software simulation is verified.