ISO 1352:2011 specifies the conditions for performing torsional, constant-amplitude, nominally elastic stress fatigue tests on metallic specimens without deliberately introducing stress concentrations. The tests are carried out at ambient temperature (ideally at between 10 °C and 35 °C) 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 ISO 1352:2011, 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.