School of Electromechanical Engineering，Hunan University of Science and Technology，Xiangtan 411201
Aiming at the problem of delamination defect monitoring at hole outlet during CFRP drilling and hole making process，the delamination damage identification at hole outlet during CFRP drilling and hole making process was studied based on acoustic emission detection technology. The time and frequency characteristics of acoustic emission and axial force signals related to delamination damage were extracted by destructive delamination test， which were used as the signal basis for judging delamination damage in drilling. Then， drilling tests were carried out，and delamination damage at hole outlet of CFRP laminates was identified based on the actual damage morphology. The results show that the instantaneous drilling axial force is higher than the critical axial force when the delamination damage occurs at the drilling outlet.The amplitude of acoustic emission signal in time domain will change dramatically，and the intensity of signal in middle and high frequency band will also increase significantly. Due to the significant time and frequency characteristics of the signal， the delamination damage at the hole outlet can be effectively identified， which provides an idea for on-line monitoring and control of delamination damage in drilling of CFRP laminates.