圆弧端齿结构微动疲劳试验加载装置的设计及实现

针对圆弧端齿结构三维微动疲劳试验难度大、成本高等问题，提出了一种二维等效加载方案，设计并实现了微动疲劳试验加载装置，建立了二维结构微动疲劳试验模型。对典型圆弧端齿结构的二维等效试件进行了微动疲劳试验，发现疲劳裂纹萌生于接触面的接触边缘，接触面出现大量微动磨屑，为典型的微动疲劳失效形式。试验结果表明，该微动疲劳试验加载装置可满足端齿结构微动疲劳试验要求，为微动损伤机理分析和微动疲劳寿命预测提供了试验数据支持。

Design and Implementation of Fretting Fatigue Test System for Curvic Couplings

A two-dimensional loading scheme for curvic couplings fretting fatigue test was designed and manufactured to reduce the costs and the technical difficulties which the three-dimensional loading scheme could bring about. A two-dimensional fretting fatigue test model was provided and tests which employing typical two-dimensional curvic couplings fretting specimen were conducted. In all of  the tests, fatigue cracks initiated on the edge of the contact surface and massive abrasive dust appeared on the contact area, which indicated the typical failure mode of the fretting fatigue occured to the contact area. The results show that this kind of loading scheme can meet the requirements of the curvic couplings fretting fatigue tests and may provide test data for the predictions of fretting fatigue life and further research on damage mechanism of fretting fatigues.