接触形式对微动疲劳的影响研究

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Fretting fatigue tests are typically performed using either a flat-on-flat or a cylinder-onflat contact configuration, configuring the surface contact or line contact. To obtain the influence of contact configuration of fretting fatigue, 45-carbon steel was investigated from the experimental device has been designed by the finite element methods. The So-N curves under the three different conditions were identified. And also the running out of abrasive dust were observed in experiments. The results showed that under the same cyclic stress amplitude, fretting fatigue life in the line contact is obviously shorter than that in the surface contact, and the life in the line contact with different cylinder radius are similar under the high cyclic stress amplitude, but under the low cyclic stress amplitude, it decreased with cylinder radius increased. Through the experiments, the abrasive dust run out earlier and more compared with surface contact.微动疲劳试验的典型接触形式主要有平面-平面和圆柱面-平面这两种，分别构成了面接触和线接触．为了获得这两种接触形式对微动疲劳的不同影响，经过有限元软件模拟计算，自行设计了实验装置，研究了45号钢在不同接触形式下的微动疲劳特性，确定了3种不同条件作用下的Sa-N曲线，并在实验过程中观察了磨屑的溢出等现象．研究结果表明：相同循环应力幅下的微动疲劳寿命，线接触下的寿命明显的比面接触下低，而不同圆柱面半径下的线接触在高循环应力幅下差别不大，低循环应力幅下，寿命随着圆柱面半径的增大而有所降低．通过实验发现，相比面接触形式，线接触下的红褐色磨屑溢出更早也更多．