ASTM E466 – Axial Fatigue – Constant Stress Amplitude

This test method determines stress versus fatigue life data by the use of uniaxially loaded test specimens under constant stress amplitudes.  Typically 15 to 20 specimens are tested to generate the SN Curve.  Common R ratios are -1.0 and 0.1.

The customer may dictate the R ratio, stress levels and the test frequency.