【摘要】 采用应力场和温度场耦合的有限元方法,计算磁头/磁盘滑动接触下铝基磁盘磁层内瞬态温度场和应力场及退磁临界条件,分析接触压力、滑动速度、摩擦系数以及磁盘表面纹理对磁层内最大摩擦温升值和最大应力值的影响.结果表明:波形纹理表面瞬间滑动接触所产生的温度分布呈波形特征,表面纹理越尖锐,磁层内的温度和应力越大;滑动速度对磁层内温度的影响大于对应力的影响;当磁层最大应力小于1.2 GPa时,所对应的速度和压力为安全工况;当温升大于180 K时所对应的工况将导致磁盘退磁.更多还原

【Abstract】 In order to develop the critical operating conditions for demagnetization of the disk,a coupled temperature-displacement finite element analysis of a slider sliding contact with a textured disk surface was performed,so as to investigate simultaneously the stress and temperature distributions in the magnetic layer.The flash temperature increasing with sliding distance was presented.The maximum magnitude of interior stress and temperature in the magnetic layer were responsible for the occurrence of demagnetization.The influences on the maximum temperature rise and stress due to the sliding velocity,contact pressure,frictional coefficient,and surface texture were examined.From the simulation results and the demagnetization temperature/stress available, the critical condition for demagnetization in magnetic recording disks was deduced.Sinusoidal surface texture produces a sinusoidal temperature distribution in transient sliding contact.Sharper texture produces larger temperature rise and stress in the magnetic layer.Effect of sliding velocity on the temperature rise is larger than that on the stress.Sliding velocity and slider pressure with maximum stress of the magnetic layer smaller than 1.2 GPa is the safe operating condition for the magnetic disk,but the maximum temperature of the magnetic layer higher than 180 K would lead to demagnetization.更多还原