直流磁场下销盘摩擦副接触面的磁感应强度和磁吸力分析

为了研究磁场对材料摩擦磨损性能的影响，通过试验检测了销盘接触时的磁吸力，利用电磁场有限元软件分析计算了销盘摩擦副在接触区域的磁感应强度大小和分布及磁吸力的大小。试验和仿真结果表明:磁感应强度和磁吸力都随线圈电流的增大和气隙的缩小而增大，并且与材料的磁化特性有关；销盘上的磁场分布不均匀，当盘旋转进行摩擦磨损试验时，盘上各点将产生动态磁化现象；由于销和盘之间的微凸峰接触存在漏磁,故在磁场仿真时可用一个极小的间隙来表示其实际磁接触状态；在销和盘接触时,可用试验得到的最大磁吸力值根据麦克斯韦公式计算出接触面的平均磁感应强度。

Magnetic Flux Density and Magnetic Attraction Force on Contact Surface of Pin-disk Friction Pair under DC Magnetic Field

In order to study the effects of magnetic field on the friction and wear properties, the magnetic attraction force between pin and disk in contact was tested, and a finite element analysis software of electromagnetic field was used to calculate the magnetic flux density and magnetic attraction force in the contact area of pin-disk friction pair. The experimental and simulation results show that the magnetic flux density and magnetic attraction force increase along with the enlargement of coil current and the reduction of gap, and they are also associated with the magnetization characteristics of materials. The distribution of magnetic field on the pin and disk is uneven, and dynamic magnetization phenomenon will appear on the disk when the disk is rotating during the friction and wear experiments. Due to the magnetic flux leakage in asperities contact surface of pin and disk, the actual magnetic contact state can be substituted for a minimum gap in the simulation of magnetic field. When the pin contacts with the disk, the average magnetic flux density of the contact area can be calculated by the maximum magnetic attraction force between pin and disk according to the Maxwell formula in experiments.