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Wednesday, July 10 • 15:50 - 16:10

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Low stress fatigue cropping is a new type cropping method based on fatigue fracture. In this paper, acoustic emission technology was used to monitor the low-stress fatigue cropping process of the tube in real time, and the acoustic emission parameters were used to reflect the fracture process of the tube during cropping. 304 stainless steel tube was taken as the experi-mental material and the eccentric loading method was adopted in the experiment. A low stress fatigue experiment was performed on the tube material with different loading parameters in-cluded loading frequency and loading time. A comparison between acoustic emission signal and vibration signal of the cropping process was studied. The acoustic emission signals of the cropping process were processed to extract the typical parameters of ringing count, amplitude, and kurtosis. The characteristics of these acoustic emission signals were used to analyse the changes in the stages of tube fracture. In addition, the correspondence between the fracture process of the tube and the parameters of acoustic emission signal is presented. According to the corresponding relationship, some feature points and thresholds of the acoustic emission signal's kurtosis and ringing count were selected to switch the loading frequency of the eccentric loading. The experiment in which the variable was the switching point of the loading frequency was performed and it has found that selecting a suitable feature point to switch the loading frequency can effectively improve the cross-section quality of the cropping.

Wednesday July 10, 2019 15:50 - 16:10 EDT
Westmount 3
  T10 Sig. Proc. & nonlin. mthds., RS04 Signal process in ac & vibr

Attendees (6)