金属材料 - 疲劳试验 - 轴向平面弯曲法

[中文适用范围]： 本文件规定了在室温（最好在 10 °C 至 35 °C 之间）下，在轴向机器上对金属样本进行平面弯曲疲劳试验的条件，恒定振幅、力或位移受控，无需故意引入应力集中。 本文件不包括反向/部分加载测试。 测试的目的是提供相关结果，例如给定材料条件下施加的应力与失效循环次数之间的关系，以硬度和微观结构表示，在不同的应力比下。 尽管规定了矩形和斜截面样品的形状、制备和测试，但本文件不包括部件测试和其他专门形式的测试。 本文件不包括缺口试样的疲劳试验，因为迄今为止任何标准都没有规定缺口试样的形状和尺寸。 附录 A 中给出了指导原则。 然而，本文件中描述的疲劳测试程序可用于测试此类缺口样本。 疲劳测试的结果可能会受到大气条件的影响。 如果需要受控条件，则适用 ISO 554:1976, 2.1。 [外文原描述]： This document specifies the conditions for conducting the plane bending fatigue test on an axial machine, constant-amplitude, force or displacement controlled, at room temperature (ideally between 10 °C and 35 °C) on metallic specimens, without deliberately introduced stress concentrations. This document does not include the reversed/partially loading test. The purpose of the test is to provide relevant results, such as the relation between applied stress and number of cycles to failure for a given material condition, expressed by hardness and microstructure, at various stress ratios. Although the shape, preparation and testing of specimens of rectangular and bevelled cross-section are specified, component testing and other specialized forms of testing are not included in this document. Fatigue tests on notched specimens are not covered by this document since the shape and size of notched test pieces have not been specified in any standard so far. Guidelines are given in Annex A. However, the fatigue-test procedures described in this document can be used for testing such notched specimens. It is possible for the results of a fatigue test to be affected by atmospheric conditions. Where controlled conditions are required, ISO 554:1976, 2.1 applies.