GB/T 18325.1-2025 Plain bearings—Bearing fatigue—Part 1:Plain bearings in test rigs and in applications under conditions of hydrodynamic lubrication

Scope

This document specifies a method for improving the comparability of test results by evaluating the bearing liner stress that causes fatigue (see Appendix A). Similar evaluations are also required in practical applications. Since the stress is caused by the pressure generated by the dynamic lubrication film, it is necessary to fully and comprehensively describe the operating and lubrication conditions of the bearing. In addition to the dynamic load, size, and operating characteristics, the following provisions must also be made for the fatigue system:
a) Under dynamic load conditions, the minimum thickness of the bearing oil film varies with time and location, but it is necessary to ensure that the bearing will not cause local overheating or shearing due to mixed lubrication during operation.
b) Under dynamic load, the circumferential and axial pressure distribution varies with time.
c) The resulting bearing liner stress is a function of time and location, especially the maximum alternating stress.
In addition, bearing fatigue may also be affected by mixed lubrication, wear, dirt, friction chemical reactions, and other effects, which complicate the fatigue problem. Therefore, this document is limited to fatigue tests under conditions where the bearing surface is completely separated by a lubricating oil film.
This document applies to oil-lubricated cylindrical bearings operating under fully dynamic lubrication conditions in test benches and practical applications. It includes the dynamic load conditions of bimetallic and multi-layer bearings.
Note: Different application requirements have driven the development of various bearing test benches. If the lubrication conditions of the test bench are not defined in detail, the test results of different test benches are neither comparable nor applicable in practice. Even if the same material is tested on different test benches, the test results may also be inconsistent.

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