关键词: 钕铁硼, 电涡流制退机, 冲击环境, 力磁衰退

Abstract: To fundamentally resolve fluid leakage issues in traditional hydraulic artillery recoil mechanisms, this study investigates the magneto-mechanical stability of neodymium iron boron (NdFeB) high-strength magnetic materials under artillery impact environments, thereby enabling innovative applications of eddy current dampers in recoil systems. This paper explores the magnetomechanical properties of NdFeB under impact by theoretical modeling and numerical computations. Aiming at the current situation of unclear dynamic magnetomechanical degradation law of NdFeB, a new kind of magnetomechanical constitutive model suitable for brittle materials was described based on thermodynamic theory and damage constitutive. The dynamic mechanics and impact demagnetization experiments were carried out, and the identification of the key parameters of the magnetomechanical constitutive model was completed on the basis of the experimental data. The dynamic calculation model of artillery was built, with constitutive model embedded in the dynamic explicit calculation via the subroutine. The magnetomechanical decay of the NdFeB at different positions and different times was extracted. The results show that the most serious degradation occurs in the inner ring of the rightmost permanent magnet, and the maximum demagnetization is 0.1668T. This study not only gives effective guidance for the use of the electromagnetic brake, but also provides an important theoretical support for the application of NdFeB materials in other impact environments.

Key words: NdFeB, electromagnetic brake, impact environment, magnetomechanical decay