中文摘要：

采用中心复合设计方法,研究服役条件对超音速等离子喷AT40涂层接触疲劳寿命的影响。基于回归分析原理,利用响应曲面方法建立了综合考虑转速、接触应力和滑差率的多因素寿命预测模型,并分析了转速、接触应力和滑差率对接触疲劳寿命的综合作用。研究结果表明：不同服役条件下AT40涂层的接触疲劳寿命具有相同的寿命分布;滑差率是影响接触疲劳寿命的主要因素,接触应力是次要因素,而转速的影响不显著;接触应力和滑差率的交互作用、转速和滑差率的交互作用均对接触疲劳寿命有显著影响。模型的显著性检验结果表明,所拟合的响应曲面回归模型具有较高的显著性,可用于表征转速、接触应力和滑差率与AT40涂层滚动接触疲劳寿命的关系。

英文摘要：

The effect of service condition on contact fatigue life of supersonic plasma sprayed AT40 coat- ing is studied by central composite design method. A multi-factor life prediction model with rotation speed, contact stress, and slip ratio is established by using response surface method based on the regres- sion analysis principle, and the comprehension effects of the three factors on contact fatigue life are ana- lyzed. The results show that the rolling contact fatigue life of AT40 coating has same life distribution un- der different service conditions. Slip ratio has the main effect on the life, and the contact stress has the secondary main effect on it, and the rotation speed has the minimum effect on it. The interactive effect be- tween contact stress and slip ratio and the interactive effect between rotation speed and slip ratio both sig- nificantly influence the rolling contact fatigue life. The significance test results show that the response sur- face model can be used to characterize the relationship among the load conditions （rotation speed, contact stress, and slip ratio） and the roiling contact fatigue life of AT40 coating.