【摘 要】
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In this paper fretting fatigue crack behavior in 1045 steel is studied by in-situ observation and finite element analysis,in-situ fretting fatigue experiments are conducted to capture real-time fretting fatigue crack formation and propagation process.The
【机 构】
：
Aero-engine Thermal Environment and Structure Key Laboratory of Ministry of Industry and Information
论文部分内容阅读
In this paper fretting fatigue crack behavior in 1045 steel is studied by in-situ observation and finite element analysis,in-situ fretting fatigue experiments are conducted to capture real-time fretting fatigue crack formation and propagation process.The fretting fatigue tests under different load conditions are carried out,then the lifetime and fracture surface are obtained.The crack prop-agation rates under different loading conditions are measured by in-situ observations.With in-situ observation,crack initiation location and direction are analyzed.Finite element model is used to calculate J-integral which then is applied to fitting with experimental crack growth rate,and estab-lishing crack growth rate model.From fitted S-N curve,it turns out that smaller load ratio leads to higher lifetime.Crack initiates slightly below the point equivalent to line contact of the contact sur-face in different test conditions,and crack direction shows no obvious relationship with load parameters.The established crack growth rate model well agrees with the test results.
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