Analysis of fretting fatigue of late-model flat in the engineering application and research

Applying the ANSYS, the three-dimensional finite element analysis is made on the late-model flat plane-to-plane contact. It also verifies the correctness of the flat fretting fatigue of the finite element analysis by comparing with Mindlin theory. It analyzes the factors such as stiffness coefficient and material properties which influence the flat fretting fatigue, and lays the theoretical foundation to solve wide carding machine flat in the actual plane-to-plane contact. Introduction Fretting refers to relative movements of small amplitude between surface in contact under the effect of alternating load such as mechanical vibration, fatigue load, electromagnetic vibration or thermal cycling (the unit of displacement amplitude is um). Fretting fatigue is fretting, which refers to the relative displacement of the contact surface whose deformation caused by a contact pair enduring alternating stress fatigue and fretting fatigue can accelerate the initiation and propagation of cracks, so that the fatigue life of the components is reduced greatly. Besides, fretting fatigue limit is even lower than the 1/3 of the fatigue limit. Therefore, the fretting fatigue is an important cause of fretting damage. At present, research on the method of fretting fatigue is physical experimental method and numerical analysis method, among which the numerical analysis method has been widely used with its strong adaptability, low cost and short cycle. In order to better understand the mechanism of action of alternating load between flat and track, the research compared with the Mindlin theory. The results demonstrate the correctness of using ANSYS to analyze fretting analysis of the plane-to-plane contact between flat and track. According to the actual situation has carried on the analysis to the calculation, and obtained some valuable conclusions, thus lay the foundation to improve the life of the flat. Establishment of finite element model Fig.1 Diagram of ball-to-plane contact Fig.2 Mechanical model Theoretical foundation. The method for solving partial slip problem was first proposed by Cattaneo in 1938, and the solution of distribution of the ball-to-plane contact stress was given by Mindlin alone in 1949, the model as shown in fig.1. According to the Mindlin theory, when the contact surface applied alternating tangential force p T T < ) ( , tangential force distribution can be expressed as 4th International Conference on Advanced Materials and Information Technology Processing (AMITP 2016) © 2016. The authors Published by Atlantis Press 218