Cyclic creep and fatigue testing of nanocrystalline copper thin films

► We observed the mechanical response associated with tension-tension fatigue under stress amplitudes and mean stress conditions at cyclic loading. ► Using feedback experiments to provide load control on sputter deposited Cu thin films. ► With an increase in the load leading to a decrease in the number of cycles to failure. ► Provide evidence of cyclic creep rate dependence and changes in the failure mechanism following a decrease in the mean load or load amplitude.