本文件规定了通过评估导致疲劳的轴承层中的应力来提高试验结果可比性的方法（见附录a）。在实际应用中需要进行类似的评估。由于应力是流体动力膜中压力积聚的结果，因此必须充分说明操作和润滑条件。除了动态载荷、尺寸和运行特性外，以下内容也充分定义了疲劳系统: a） ？在动态加载条件下，最小轴承油膜厚度随时间和位置的变化，以确保磨合时不会因混合润滑而导致过度局部过热或剪切； b） ？动态载荷下压力沿周向和轴向随时间的分布； c） ？由此得出轴承层中产生的应力，作为时间和位置的函数，尤其是最大交变应力。 此外，轴承疲劳可能会受到混合润滑、磨损、污垢、摩擦化学反应和使用中遇到的其他影响的影响，从而使疲劳问题复杂化。 因此，本文件仅限于轴承表面通过润滑膜完全流体动力分离时的疲劳。 本文件适用于在全流体动力润滑条件下运行的试验台和应用中的油润滑滑动圆柱轴承。它包括双金属和多层轴承的动态载荷。 注:不同要求的实际应用数量导致了许多轴承试验台的开发。如果未详细定义这些试验台上使用的润滑条件，则不同试验台的试验结果通常既不可比较，也不适用于实践。不同的试验台可能会在相同的材料中产生不一致的排名。

This document specifies a method of improving test result comparability by evaluating the stresses in the bearing layers leading to fatigue (see Annex？A). A similar evaluation is required in practical applications. Because the stresses are the result of pressure build-up in the hydrodynamic film, it is essential to fully state the conditions of operation and lubrication. In addition to dynamic loading, dimensional and running characteristics, the inclusion of the following adequately defines the fatigue system: a)？under conditions of dynamic loading the minimum bearing oil film thickness as a function of time and location to ensure no excessive local？overheating or shearing as a result of mixed lubrication when running in; b)？the distribution of pressure circumferentially and axially with time under dynamic loading; c)？from this the resulting stresses in the bearing layers as a function of time and location, especially the maximum alternating stress. Furthermore, bearing fatigue can be affected by mixed lubrication, wear, dirt, tribochemical reactions and other effects encountered in use thus complicating the fatigue problem. This document is therefore restricted to fatigue under full hydrodynamic separation of the bearing surfaces by a lubricant film. This document applies to oil-lubricated plain cylindrical bearings, in test rigs and application running in conditions of full hydrodynamic lubrication. It comprises dynamic loading in bi-metal and multilayer bearings. NOTE？The number of practical applications with different requirements has led to the development of many bearing test rigs. If the conditions of lubrication employed on these test rigs are not defined in detail, test results from different rigs are generally neither comparable nor applicable in practice. Different test rigs can yield inconsistent ranking among equal materials.