金属材料.扭矩控制疲劳试验

[中文适用范围]： 本文件规定了在不故意引入应力集中的情况下对金属样品进行扭转、恒幅、名义弹性应力疲劳试验的条件。 测试通常在环境温度或高温空气中进行，方法是将纯力偶绕其纵轴施加到样本上。 虽然本文件描述了圆形横截面和管状横截面样本的形式、制备和测试，但不包括组件和其他专门类型的测试。 同样，在等幅角位移控制下进行的低周扭转疲劳试验也被排除在外，这种试验会导致几千次循环失效。 [外文原描述]： This document specifies the conditions for performing torsional, constant-amplitude, nominally elastic stress fatigue tests on metallic specimens without deliberately introducing stress concentrations. The tests are typically carried out at ambient temperature or an elevated temperature in air by applying a pure couple to the specimen about its longitudinal axis. While the form, preparation and testing of specimens of circular cross-section and tubular cross-section are described in this document, component and other specialized types of testing are not included. Similarly, low-cycle torsional fatigue tests carried out under constant-amplitude angular displacement control, which lead to failure in a few thousand cycles, are also excluded.