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应用科学学报 ›› 2001, Vol. 19 ›› Issue (3): 277-282.

• 论文 • 上一篇    

高温复合载荷下钛合金微动疲劳特性的研究

戴振东, 王珉, 朱如鹏, 潘升才   

  1. 南京航空航天大学机电学院, 江苏南京 210016
  • 收稿日期:2000-01-09 修回日期:2000-09-28 出版日期:2001-09-30 发布日期:2001-09-30
  • 作者简介:戴振东(1962-),male,Shanxi,Professor,Doctor;王珉(1954-),male,Anhui,Professor,Doctor Tutor Teacher.

Fretting Fatigue Characteristics of Titanium JZAlloy at Elevated Temperature JZUnder Complex Loads

DAI Zhen-dong, WANG Min, ZHU Ru-peng, PAN Sheng-cai   

  1. Department of Mechanical Engineering, Nanjing University of JZAeronautics and Astronautics, Nanjing 210016, China
  • Received:2000-01-09 Revised:2000-09-28 Online:2001-09-30 Published:2001-09-30

PDF

100

被引次数

4

摘要：

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~200℃,随温度增加而降低;随后反而增加,300~500℃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=2.691-0.409lnNe,从5~45μm时,摩擦系数从0.2增加到0.8.

关键词: 钛合金, 复合载荷, 微动疲劳, 微动摩擦系数

Abstract:

The effects of the various parameters on the fretting fatigue life and the fretting friction coefficient for a contact pair of titanium alloy and stainless steel are experimentally studied at the room and elevated temperature. The test results show that fretting fatigue life heavily declines at low tensile stresses, and its greatest decrease corresponds to the contact pressure at which the dissipated friction work is the maximum. It changes with temperature nonlinearly:it decreases first when the temperature is between 20 to 200℃, increases up to 300℃ and then reduces to several cycles between 400 to 500℃. The fretting fatigue life under complex loads monotonously decreases with the increase of the high cycle load while the low cycle loads keep constant. The friction coefficient (FC) increases with the number of cycles at the beginning, then reduces, and finally keeps a stable value. FC reduces greatly with the increase of the temperature due to the formation of the lubricious oxide film. FC increases linearly with the amplitude when it is less than the critical value and then keeps constant, the value of the coefficient can be regressed as f=2.691-0.409 lnNe. The coefficient increases from 0.2 to 0.8 with the increase of amplitudes from 5 to 45 micrometers.

Key words: fretting fatigue, complex load, titanium alloy, fretting friction coefficient

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