Piezoelectric Drive Type High Frequency Fatigue Testing Machine

Abstract

The invention discloses a piezoelectricity-driven high-frequency fatigue testing machine. The piezoelectricity-driven high-frequency fatigue testing machine is characterized in that a piezoelectric oscillator 7 is utilized as a driving force source; the piezoelectric oscillator 7, a preset load adjustment mechanism 6, an elastic loading device 5, a sample 4 needing to be tested, and a clamping unit 3 form a resonant system; and under external alternating voltage, deformation of the piezoelectric oscillator 7 is amplified by system resonance and is translated into a alternating load to act on the sample 4 needing to be tested so that fatigue detection and test are realized. The piezoelectric oscillator 7 can adopt a common double-crystal plate bended oscillator structure or a single-crystal plate bended oscillator structure shown in the figure 2 of the patent specification, and also can adopt a structure combined from a single-crystal plate oscillator and a double-crystal plate oscillator in series or in parallel.

Description

technical field [0001] The invention belongs to the field of fatigue detection and testing, and in particular relates to a fatigue testing device for hard and brittle materials and tiny components under small amplitude and high frequency stress. Background technique [0002] High-frequency fatigue testing machine is widely used in testing the fatigue properties of metal and non-metallic components such as tension and compression, torsion, bending, pitting corrosion, etc. , electronics, aviation, aerospace, metallurgy and other fields have a wide range of applications. However, with the continuous development of science and technology and industrial level, most of the mechanical parts or tiny structural parts composed of hard and brittle materials work in the state of small amplitude and high frequency stress above 200Hz. The emergence of these special performance components makes it increasingly important to develop corresponding fatigue testing machines that can imitate th...

AI Technical Summary

Problems solved by technology

The existing high-frequency fatigue testing machines are all driven by electromagnetic drive or electro-hydraulic servo drive. Since they all need to work in the system resonance state, limited by the system impedance and reluctance, the general working frequency is not more than 100Hz, and there is generally amplitude control. Due to problems such as poor performance, poor resonance stability, and low loading accuracy, it is currently not suitable for the detection of tiny, hard and brittle material components, and high-frequency stressed components.

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