Acoustic Emission testing

Acoustic emission testing of metal material fatigue crack

Update time：2006-03-02 14:50　　　 Viewed：次

Initiation and propagation of fatigue crack is the main failure form of mechanical parts under variable load. Using the modal acoustic emission technology having get rapid development in recent years to get fatigue crack acoustic emission waveforms can associate the acoustic emission signal received with the physical condition of acoustic emission source. In the waveform analysis, the relationship between AE parameters and crack propagation speed can be established by using parameter analysis method to extract the waveform characteristics. For the adoption of a variety of integrated technology for signal analysis, the results obtained by signal characteristics will be more accurate.

Fatigue wear on the surface of gear is one of the main kinds of failure of the gear. From the perspective of the energy of the elastic mechanics, energy relationship of gear fatigue crack is deduced when extension. According to the characteristics of acoustic emission signal, we have constructed the theoretical model of acoustic emission signal of fatigue crack when extension, illustrated that the main factors influencing the intensity of acoustic emission signal is energy for crack propagation time, deformation and load volume and the rate of change of elastic modulus, theoretically proved the feasibility of acoustic emission technique for testing fatigue wear. (Editor：admin)

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