For fatigue tests on crankshafts the Zwick vibrophore or a servo-hydraulic testing machine can be used. In the case shown the S-N curve is determined according to DIN 50100. In view of the relatively low frequency of 10…30Hz, a servo-hydraulic testing machine was employed. Fatigue occurs through bending strain;  the mounting table and tool can be reconfigured to enable all segments of the crankshaft to be tested. 

A fatigue limit of approx. N=3x10⁶ cycles is assumed here. Force-controlled sinus cycles are performed as per the staircase method. Fatigue testing via torsional load is possible using the same machine.