中文摘要：

探讨了钛合金微动疲劳（FF）强度的估算方法,建立了适用于存在局部磨损情况的钛合金FF寿命估算模型,为工程装备FF损伤的控制提供依据。对于方足微动桥的FF实验,考虑了多轴疲劳问题,并计及了接触几何与局部磨损造成的应力集中对FF强度的影响,此模型在混合滑移条件下适用性较好。将局部应力-应变法引入到钛合金FF寿命估算模型中,用等效应力集中系数描述磨损的作用,该模型能较好地适用于钛合金基材及表面镀软质减摩膜层（包括物理气相沉积Cu-NiIn合金膜与MoS2-Ti复合膜）的FF寿命估算。

英文摘要：

The prediction methods of fretting fatigue（FF） strength of titanium alloys were studied.The prediction model of FF life of titanium alloys was put forward for the situation involving local wear between contact surfaces.The study provides guide for controlling FF damage of engineering equipments.The multi-axis fatigue and stress concentration resulted from contact geometry and local wear on FF strength were considered for square foot fretting bridge.The model was well suitable to the mix-slip situation.The local stress-strain method was used to calculate the FF life of titanium alloys and the wear action was considered by introducing the equivalent stress concentration coefficient.Based on the above model,the FF life of titanium alloys with and without surface lubricating soft coatings（including physical vapor deposition CuNiIn alloy coating and MoS2-Ti composite film） was well predicted.