Analysis Of Life Change Rules And Shadow Factors Of Non-Lubricated Friction-Fatigue Composite Damage

The load friction pair system refers to a type of mechanical system that exists and transmits the alternating load while the system is working.Such typical systems are ubiquitous in various types of mechanical transmission systems.During the operation of such systems,friction-fatigue composite damage occurs.The damage caused by this composite action is not directly superimposed,but in a complicated way.Interaction.The damage law of the research materials under the combined action of friction and fatigue provides the basis for the design of such mechanical systems.In this paper,the research work is carried out through the combination of finite element numerical simulation analysis and experimental research.The main research contents are as follows:1.According to the needs of the research,combined with the original test equipment,the performance analysis of the key components was completed,and the development of the vibration test system was added based on Lab VIEW.2.The finite element method is used to study the variation law of composite damage life of material samples under friction-fatigue composite action.The variation law of the influence on the bending fatigue life when the frictional action is in the middle position of the working face of the test piece and the frictional action is at the left end position of the working face of the test piece is analyzed.3.Through the test and analysis,the damage life change and important influencing factors under friction-fatigue composite action are proposed.The bending fatigue test and the friction-fatigue composite test were carried out.The results show that:(1)the bending fatigue life of the test piece material is different from the stress sensitivity.There is a value or interval in which the stress is less than this interval,and the bending fatigue life cycle number is more sensitive to the change of the stress;when the stress is larger than this interval,the bending fatigue life cycle number is less sensitive to the change of the stress.(2)The friction-fatigue composite action does not coincide with the maximum stress generated by the tensile force in the middle position of the test piece.When the tensile force is large,the friction-fatigue composite action changes the position of the largest dangerous section of the test piece,and the working face of the test piece The left end changes to the position of the friction.(3)When the frictional action coincides with the maximum stress of the single fatigue action,the fracture position is at the maximum stress,that is,the friction constraint position.4.The fracture morphology change characteristics of friction-fatigue composite action were analyzed by scanning electron microscopy...