不同滑动速度下干接触体瞬态温度场计算

Calculation of Temperature Field in Dry Sliding Contact at Different Speeds

工程实际中,由于摩擦力的存在,接触副的运动将导致接触区内产生大量的摩擦热,使接触副温度升高;由此产生的瞬时高温会使接触副更易发生弹塑性变形、引起表层下裂纹的萌生及扩展,甚至使接触副表面发生化学变化。建立了不同滑动速度下干接触体的滑动接触模型,利用快速傅立叶变换,通过求解拉普拉斯热传导方程,获得光滑及粗糙表面接触副的瞬时温升以及接触体内部各离散点的温度分布,即半无限体干接触的温度场。结果表明,相同载荷及摩擦因数条件下,相对滑动速度对接触体的温升及其温度分布有重要影响;粗糙峰表面接触处的瞬时温升远高于光滑表面接触处的瞬时温升。

With the interaction of the friction force between surfaces of actual contact, the temperature in sliding contact will rise, even lead to a transient temperature arising, and because of this the surfaces will tend toward elastic or plastic distortion, occurrence and extension of the crack under the surfaces, even chemical changes. A dry contact model under the different speeds was developed. With the equation of Laplace heat conduction solved using FFT, the transient temperature arising at the contact spots of two smooth or rough sliding surfaces was calculated, and the temperature distribution of discrete spots in the contact field, namely temperature field under dry contact in the contact field was drawn. The results indicate that with the same load and friction factor, the relative speed of the sliding has great influence to the temperature arising and the temperature distribution in sliding contact ; the transient temperature arising at the contact spots of two sliding rough surfaces is more higher than that of two sliding smooth surfaces.