Affiliations: [a] School of Mechanical Engineering, Nanjing University of Science and Technology, Nanjing, Jiangsu, China
Correspondence:
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Corresponding author: Guolai Yang, School of Mechanical Engineering, Nanjing University of Science and Technology, Nanjing, 210094, Jiangsu, China. E-mail: yyanggl@njust.edu.cn
Abstract: This study focused on the damage of permanent magnets(NdFeB) in the electromagnetic buffer under the intensive impact load. According to the constitutive characteristics of the permanent magnets, a constitutive model suitable for NdFeB called damage-modified ZWT was determined. Furthermore, the specific parameters in the constitutive model were determined by fitting the constitutive curve. Then the incremental expression was established for the constitutive model and the model was embedded into ABAQUS via the VUMAT subroutine interface. A dynamic model of the electromagnetic buffer was established and calculated. After that the evolution and distribution law of damage in permanent magnets under the intensive impact load were clarified by analyzing the finite element results. Finally the damage of the device is reduced by optimizing the geometric parameters. The results show that the permanent magnets near the inner ring are damaged more from the radial distribution of the damage and the permanent magnets on both sides are damaged more from the lateral distribution of the damage, which provides a reference for the design of electromagnetic buffers.
Keywords: Intensive impact load, the damage in permanent magnets, damage-modified ZWT constitutive model, VUMAT subroutine
