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实验研究了多个参数对钛合金与不锈钢摩擦副微动疲劳寿命和微动摩擦系数的影响 .结果表明 ,较低的拉应力下 ,微动疲劳寿命显著降低 ,其最大降低对应的接触应力下 ,微动副具有最大的摩擦功耗 .微动疲劳寿命随温度非线性变化 :从室温～ 2 0 0℃ ,随温度增加而降低 ;随后反而增加 ,3 0 0～ 5 0 0℃持续降低 .复合载荷下 ,低周幅值不变 ,增加高周载荷的幅值 ,微动疲劳寿命随幅值比的增加而降低 .最初 ,摩擦系数随循环参数增加 ,随后降低并趋于稳定 .高温下由于形成了润滑性氧化物而大幅度降低 .微动幅度小于临界值时 ,摩擦系数随微动幅度的增加线性增加 ,然后保持常值 .摩擦系数和正压力间的关系满足 f =2 .6 91 - 0 .40 9lnσN,从 5～ 45μm时 ,摩擦系数从 0 .2增加到 0 .8.
The effects of several parameters on the fretting fatigue life and fretting friction coefficient of the friction couple between titanium alloy and stainless steel were investigated experimentally.The results show that the fretting fatigue life is significantly reduced under the low tensile stress and the maximum reduction is corresponding to the contact stress , And the fretting pair has the largest frictional power loss.The fretting fatigue life varies nonlinearly with temperature from room temperature to 200 ℃, decreases with increasing temperature, and then increases but decreases continuously from 300 ℃ to 500 ℃. Under the composite load, the amplitude of the low-cycle increases and the amplitude of the high-cycle load increases, and the fretting fatigue life decreases with the increase of the amplitude ratio.Finally, the friction coefficient increases with the cycle parameters, then decreases and tends to be stable. Due to the formation of a lubricious oxide greatly reduced.When the fretting amplitude is less than the critical value, the friction coefficient increases linearly with the increase of fretting amplitude, and then maintain constant.Friction coefficient and positive pressure relationship between f = 2.691 - 0 .40 9lnσN, from 5 ~ 45μm, the friction coefficient increased from 0.2 to 0.8.