Study of the On-Line Monitoring on the Effect of Laser Shock Processing for Residual Stress by the Properties of Acoustic Wave
In order to realize the on-line monitoring of the effect of laser shock processing(LSP),acoustic waves generated during the LSP of 45 steel are measured in real time by a wide-band microphone and digitized at a sampling frequency of 48KHz.The waveforms of the received acoustic signal imported to MATLAB are analyzed and in order to investigate the frequency characteristic of the acoustic wave, a power spectral density(PSD) analysis has been carried out. Based on the value of the largest peak of the PSD and compressive residual stress of metal materials induced by the laser shock processing, the correlation equation was established with the application of least square method for the on-line monitoring.
Y. Li and H. Y. Qin, "Study of the On-Line Monitoring on the Effect of Laser Shock Processing for Residual Stress by the Properties of Acoustic Wave", Applied Mechanics and Materials, Vols. 44-47, pp. 680-687, 2011