滚动轴承.陶瓷轴承球.用缺口球试验测定强度

[中文适用范围]： 本文件规定了一种测定滚动轴承用陶瓷球（ preferably 由氮化硅（Si3N4）制成，球径从 3 毫米到 50 毫米）强度的方法。注 1：ISO 26602 规定了滚动轴承球用预处理氮化硅材料的要求。ISO 3290-2 规定了滚动轴承用成品氮化硅球的要求。注 2：其他测定陶瓷球强度的测试方法见参考资料 [7]。强度测试结果轻微依赖于泊松比。因此，所有计算限制在泊松比 0.15 到 0.35 的范围内。这包括滚动轴承中使用的典型氮化硅陶瓷的泊松比。该方法也可用于由其他陶瓷材料制成的滚动轴承球，但报告的修正系数可能无效。注 3：各向同性材料的泊松比可通过 ISO 17561 中给出的一种方法确定。注 4：可根据 ISO 20501 进行进一步的统计分析。由于陶瓷材料的（缺陷控制的）脆性断裂行为，在表征一系列标称相同的样本时，个别结果可能会出现显著离散。 [外文原描述]： This document specifies a method for the determination of the strength of finished ceramic balls for ball bearings, preferably made of silicon nitride (Si3N4), with ball diameters from 3 mm to 50 mm. NOTE 1 ISO 26602 specifies the requirements for preprocessed silicon nitride materials for rolling bearing balls. ISO 3290-2 specifies requirements for finished silicon nitride balls for rolling bearings. NOTE 2 Other test methods to determine ceramic ball strength can be found in Reference [7]. The results of the strength tests slightly depend on the Poisson's ratio. For this reason, all calculations are restricted to a Poisson's ratio ranging from 0,15 to 0,35. This includes the Poisson's ratio of a typical silicon nitride ceramic used as rolling element in ball bearings. The method can also be used for rolling bearing balls made of other ceramic materials, but the reported prefactors may not be valid. NOTE 3 Poisson's ratio of isotropic materials can be determined by one of the methods given in ISO 17561. Because of the (defect controlled) brittle fracture behaviour of ceramic materials, a significant scatter of individual results in the characterization of a series of nominally identical samples can occur. NOTE 4 A further statistical analysis according to ISO 20501 can be carried out.