Method for testing high-frequency fatigue characteristic of material under microscale

Abstract

The invention discloses a method for testing a high-frequency fatigue characteristic of a material under microscale. The method comprises the following steps of (1) firmly connecting one end of a homogenous metal or non-metal test sample to an ultrasonic vibration generation device, and enabling the other end of the homogenous metal or non-metal test sample to be in contact with a diamond pressing head at a fixed position, wherein the diamond pressing head is connected with a high-precision force measurement system; (2) adjusting parameters of the ultrasonic vibration generation device to obtain vibration frequency f and amplitude A which need to be tested, generating ultrasonic vibration to enable the diamond pressing head to partially impact the homogenous metal or non-metal test sample so as to cause a high-frequency alternating load under a microscale; (3) measuring alternating impact force generated by vibration of the test sample through the high-precision force measurement system so as to calculate alternating stress on part of the test sample; (4) observing a fatigue damage condition of a region, which is in contact with the test sample, of the diamond pressing head at different times through a scanning electron microscope to obtain a fatigue intensity and alternating stress-circulating frequency curve of the material under microscale.

Description

technical field [0001] The invention relates to a testing method for high-frequency fatigue characteristics of micro-scale materials. Background technique [0002] With the continuous improvement of product performance and use requirements, the microscopic fatigue characteristics of materials have attracted more and more attention from the industry. macroscopic manifestation. However, the current test methods for the fatigue properties of materials are mainly concentrated on the macro scale. The fatigue properties of parts under various stress states such as tension, compression, and torsion can be analyzed by using equipment such as universal mechanical testing machines. The fatigue strength and S-N The curve can have good guiding significance for the macroscopic damage analysis and life prediction of parts. However, the same material often exhibits different fatigue properties under macroscopic and microscopic conditions. , its resistance to pitting corrosion and local ...

AI Technical Summary

Problems solved by technology

However, the same material often exhibits different fatigue properties under macroscopic and microscopic conditions. , its resistance to pitting corrosion and local damage is significantly lower than that of coarse-grained alloy materials, so the test results of macroscopic fatigue characteristics cannot be used for the analysis of microscopic fatigue characteristics

There is no method in the prior art that can effectively test the microscopic fatigue properties of the specimen

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