Electromagnetic Driving Technique Applied to Split-Hopkinson Pressure Bar Device
用于Hopkinson压杆装置的电磁驱动技术

In order to enhance efficiency and measuring precision of split Hopkinson pressure bar device, the electromagnetic coil driving conductor bar was designed and principle experiment was carried out through the analyses of electromagnetic driving technique. Based on mini split-Hopkinson pressure bar device, the electromagnetic coil driving principle was applied to striking bar driving and the single electromagnetic coil was applied to driving of strikers with different length. Results show that there is a linear relation between quantity of electric charge and the velocity of bar with different lengths. According to test results of dynamic stress-strain curves for magnesium alloy, it verifies that this system has excellent velocity control, good repeatable measuring precision, high reliability and practicability. Results also show that electromagnetic interference does not affect signal collection. With the aid of this principle, through enhancing quantity of electric charge or using multi-coils coaxial driving technique, the striker bar with various specifications in Hopkinson pressure bars device can be efficiently driven, and Hopkinson pressure bar system may be simplified.