Research on Friction Acoustic Emission Signal Characteristics of Fatigue Crack
Due to the complexity of acoustic emission wave generation,propagation and interaction with structure,acoustic emission waveform analysis becomes difficult.In order to reduce the interference of fatigue crack friction signals in the process of crack growth monitoring,the acoustic emission(AE)signals caused by crack friction of metal components are analyzed.By provid-ing 30 Hz and 180 Hz vibration excitation to the specimen with prefabricated crack,the motion of crack bonding surface is induced,and acoustic emission signals are generated.Several R15a transducers with different distances from the crack are used to record acoustic emission signals at different resonant frequencies,and the recorded waveform is analyzed.Under different resonance condi-tions,the acoustic emission signals with different characteristics are induced by the motion of the varying crack interface.Through multi-sensor experiments,the differences of friction acoustic emission signals and their geometric propagation laws at different dis-tances from the crack are studied and summarized.
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