Abstract ASTM E466-21 is a pivotal standard published by ASTM International that outlines the standard practice for performing force-controlled, constant amplitude axial fatigue tests on metallic materials. This paper provides an in-depth analysis of the standard’s scope, procedural requirements, apparatus calibration, specimen preparation, and data reporting. It highlights the significance of E466-21 in generating S-N (stress-life) curves, comparing material fatigue resistance, and ensuring repeatability across laboratories. Key updates from previous versions and practical implementation considerations are also discussed. 1. Introduction Fatigue failure accounts for approximately 90% of all metallic service failures, making standardized fatigue testing essential for material selection, design validation, and quality assurance. ASTM E466-21 (“Standard Practice for Conducting Force Controlled Constant Amplitude Axial Fatigue Tests of Metallic Materials”) replaces the previous E466-15 version. It provides a systematic framework for axial fatigue testing under uniaxial, constant amplitude, sinusoidal or equivalent waveform loading.
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