STUDY ON OPTIMUM OF LASER-SHOCKING PARAMETERS FOR IMPROVING FATIGUE LIFE OF AIRCRAFT ALUMINUM ALLOY
STUDY ON OPTIMUM OF LASER-SHOCKING PARAMETERS FOR IMPROVING FATIGUE LIFE OF AIRCRAFT ALUMINUM　ALLOY

The aircraft aluminum 2024-T62 is shock-treated by pulsed laser with the same wavelength and different pulse durations. The laser parameters, arrangements of laser optics and strengthening effects are investigated. The optimal laser-shocking parameters, i.e., a pulse durotion (FWHM) of 30ns, shot spot 7 to 10mm in diameter and pulse energy of 15-20J are obtained under the condition that the Q modulation crystal is KD*P and the laser optical system has three amplification stages. Therefore, the fatigue life of aluminum specimens is increased greatly and the maximum increasement is 23. 7 times.