Study on a High Frequency Resonance Fatigue Apparatus Using a Piezoelectric Vibrator

Abstract

In order to measure the fatigue property of the small and hard brittle components working under the condition of the little amplitude, high frequency force, a novel kind of high frequency resonance fatigue testing apparatus which driven by the piezoelectric vibrator is proposed. Firstly, the working principle of the apparatus is analyzed, and the dynamic model of the apparatus is established to get the systemic dynamic characteristics. Then a prototype is designed and produced. Finally, the maximum load on the sample is measured by the test. The results indicate that the maximum load on the sample is 75.1 N-172.5 N when the AC voltage amplitude (90 V-255 V) , thickness of the elastic loader (30 mm-45 mm)and the thickness of the plate spring (0.6 mm-1.2 mm) are changed. The prototype made in this paper is suitable for the tensile and fatigue testing with the load level mentioned above under the condition of little amplitude and high frequency force.