Research on high-frequency small-load fatigue testing device driven by piezoelectric actuator.

A novel small-load fatigue testing device whose actuation resource is the piezoelectric material is proposed. The procedure of energy conversion and motion transfer is analyzed in detail. In the experiment by which the characteristic of the fatigue testing device is tested, the testing device works at resonance and the amplitude of the output could be up to 6.3 mm and output force is in the range of 0.6-2.5 N when the actuation frequency is higher than 100 Hz. The article presents the details of a piezoelectric device that is superior not only in smaller output force and higher testing frequency but also in high resolution, quick response, small scale, no noise, and anti-electromagnetic interference. The research about this kind of testing device benefits increasing the testing efficiency and development of a new material.