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在任何给定工况下,有一系列因素影响最终选择轴承合金的种类和牌号,但首先考虑的必须是承载能力。如果轴承材料在所需的使用时间内不能承受所施加的负荷,那么轴承材料的其它特性再满意也是毫无意义的。因此习惯于把轴承材料抗疲劳性能进行分级,这对于轴承使用者和供应商都是极为重要的。 把轴承材料抗疲劳性能分级的传统方法是用最大单位负荷,即轴承经受的最大负荷被轴承投影面积（长度×直径）所除。直到不久前这仍是人们希望为某一应用场合选择合适轴承材料的唯一使用的依据。但这种方法具有很大缺陷,因为疲劳不仅与负荷,而且与所加负荷频率有关。如讲某一轴承在承受一定的单位负荷下不会破坏,这是一种不恰当的评估方法,因为没有讲到该轴承在一定的单位负荷下能承受多长时间。 美国JPl公司现已采用最高油膜压力（POFP）来评估常用轴承材料。它利用传统的安德伍试验机的试验数据,建立了最高油膜压力值和疲劳前循环次数的数学方程,找出了有关额定值,并提出了如何使用该额定值的方法。 下面介绍该公司是如何按照最高油膜压力来评定材料疲劳寿命的。
Under any given operating conditions, there are a number of factors that influence the final choice of bearing alloy type and grade, but the first consideration must be load carrying capacity. If the bearing material can not withstand the applied load for the required period of use, then it is meaningless to be satisfied with the other characteristics of the bearing material. It is therefore customary to classify the fatigue resistance of the bearing material, which is extremely important for bearing users and suppliers. The traditional method of classifying the fatigue resistance of a bearing material is to use the maximum unit load, which is the maximum load the bearing is subjected to, divided by the projected bearing area (length × diameter). Until recently it was still the only basis on which people wanted to choose the right bearing material for a particular application. However, this method has great drawbacks, because fatigue is not only related to the load, but also to the load frequency. For example, a bearing under certain unit load will not be damaged, this is an inappropriate assessment method, because there is no talk about the bearing under certain unit load can bear how long. US JPl Corporation has now adopted the highest film pressure (POFP) to evaluate commonly used bearing materials. It uses the test data of the traditional Andromeda test machine to establish the maximum oil film pressure and fatigue cycles before the number of mathematical equations to find the relevant ratings and put forward how to use the rating method. The following describes how the company in accordance with the highest film pressure to assess the fatigue life of the material.