Torsional Test

 Rotating Wire Bending Fatigue Test
In many applications, wires are subjected to various cyclic stresses. Fatigue strength can be determined quickly and easily in rotating bar bending fatigue tests, in which the rapidly rotating (up to 10000 rpm) specimen is additionally loaded with a force perpendicular to the axis of rotation. This flexure plus the rotation provides a tensile-compression loading of the specimen surface.
Specimen preparation is especially important here, an undamaged surface being essential.