The Factors Influencing The Fatigue Life Of Rolling Bearings

Publish Time: 06/22 2021 Author: Site Editor Visit: 14043

In recent years, the tribological design of general mechanical parts has received widespread attention. Rolling bearings are one of the most widely used mechanical parts. With the development of numerical calculation techniques and methods, calculation simulation and simulation tests have been widely used in the tribology of rolling bearings. Research and product design. The tribological design of rolling bearings has two ideas, forward and reverse.

The performance of the rolling bearing has a significant impact on the performance of the mechanical system. However, there are many factors that affect the fatigue life of the rolling bearing, such as operating temperature, impact load, reliability, material, use conditions, limit speed, surface roughness, inclusions, indentation, and lubrication Condition, radial clearance, deflection, fatigue crack-induced stress, tangential friction, residual stress and hoop stress, surface treatment, etc., these factors affect each other, plus the non-repeatability of the fatigue life test, the influencing factors are still difficult to be accurate Quantitative description.

The classic L-P theory of rolling bearing fatigue life is based on the assumption that the fatigue failure of rolling contact originates from the depth of the maximum orthogonal shear stress under the contact area. However, with the development of bearing manufacturing technology, fatigue failure modes originating from the surface appear more frequently than subsurface fatigue failure modes. There are three mechanisms of crack initiation: crack initiation from the surface, crack initiation from near the surface, and crack initiation in the material matrix.

The pitting originating on the surface and the spalling life originating below the surface are competing failure modes, which are predicted as a function of the film thickness ratio, the root mean square value of the roughness peak slope, and the traction coefficient in the boundary lubrication roughness peak contact.

With the development of high-speed railways and the aviation industry, there are more and more requirements for the high reliability of bearings. At the same time, the bearing application environment temperature changes greatly. It is necessary to deeply study the coupling effect of reliability and temperature. Rolling bearing materials are still under development. It is necessary to explore the relationship between the surface integrity of parts and surface fatigue pits, and reveal the influence of part surface integrity and lubrication effects on fatigue pits on a microscopic scale. On the other hand, combining load characteristics and material dynamic response to study spalling failure, analyze the dynamic response of bearing materials to external loads, study the coupling relationship between fatigue performance and material properties, and obtain the relationship between material dynamic response and surface fatigue spalling.

For other factors affecting bearing fatigue life, such as lubricants and additives, surface roughness, hoop stress and interface sliding, etc., comprehensive research is also needed, such as establishing a database and developing software packages to realize automatic analysis of lubricants and bearing materials And choice, this is also one of the future development directions.

Analyzing the factors that affect the bearing's rolling fatigue relief will help to better understand the mechanism of bearing fatigue failure. On the one hand, it can avoid the factors that reduce the bearing life as much as possible and improve the fatigue life of the bearing; on the other hand, it can provide certain guidance for the development of fatigue life theory, in order to improve the accuracy of bearing fatigue life prediction.

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