Magnetically driven flyer plate technology can be used for the study of high-pressure equation of state and material properties. Generally, when the same force pushes objects of different masses, the lighter object always gains greater velocity. However, in a magnetically driven symmetrical flyer plate launch experiment, the same current drove two flyer plate couple of thicknesses 0.37 mm and 0.48 mm. The final measurement velocity of the 0.37 mm flyer plate couple was 18 km/s, and the final measurement velocity of 0.48 mm flyer plate couple was 19 km/s; that is, the measured velocity of the thick flyer plate couple was even greater.

This paper studies the physical mechanism of this anomalous phenomenon in the magnetically driven symmetrical flyer plate launch experiment.

A two-dimensional magnetically driven simulation code (MDSC2), in which the boundary magnetic field is affected by ablation, was used to simulate and analyze this experiment.

The numerical simulation shows that, the MDSC2 code with the boundary magnetic field affected by ablation can correctly simulate the dynamic process of 0.37 mm and 0.48 mm flyer plate couple, and the simulated velocities of 0.37 mm and 0.48 mm flyer plate couple are consistent with the measured velocities. The reason the final recorded velocity of the thicker flyer plate couple is larger than that of thinner one is that the time to complete melting for the thicker flyer plate is longer than that of thinner one in the magnetically driven symmetrical flyer plate experiment.

This work advances the physical understanding of magnetically driven flyer plate launch process, and further confirms the correctness of the boundary magnetic field formula with the ablation effect.