Dynamic mechanical characteristics of NdFeB in electromagnetic brake

Abstract

With the continuous development of artillery, the disadvantages of hydraulic recoil brakes gradually appear. At the same time, the appearance of high-performance NdFeB permanent magnet makes it possible to apply electromagnetic braking technology to recoil mechanism. In this paper, prototype tests of a certain artillery were carried out to verify the feasibility of the electromagnetic brake (EMB) and obtain the electromagnetic braking force. Due to the brittleness of NdFeB, in order to eliminate the worry about the safety of EMB, SHPB experiments of NdFeB were carried out. Then, based on the assumption of uniform crack distribution, the law of crack propagation and damage accumulation was described theoretically, and the damage constitutive model suitable for brittle materials was proposed by combining the Zhu-Wang-Tang (ZWT) equation. Finally, the numerical simulation model of the artillery prototype was established and through calculation, the dynamic mechanical characteristics of NdFeB in the prototype were analyzed. The calculation results show that the strength of NdFeB can meet the requirements of the use in the working process. From the perspective of damage factor, the damage value of the permanent magnet on the far right is larger, and the damage value of the inner ring gradually decreases to the outer ring.

Keywords

• Electromagnetic brake
• Sintered NdFeB
• Damage constitutive
• Dynamic mechanical characteristics