Considering the needs of aircraft battle damage repair,based on the bonded composite repairs,a metal crackrapid repair method based on vacuum assisted resin infusion (VARI)process was studied. The VARI repair process was compared with the traditional wet bonded repair process and mechanical reinforcement repair process through static tension and fatigue experiments,the static strength recovery rate,fatigue life, repair time and specific static strength recovery rate of the specimens under different repair processes were obtained. The damage process of the VARI repair specimen was deeply studied with the help of finite element analysis method. Taking the specific static tensile strength recovery rate as the index,the repair patch parameters were further optimized by using Design Expert software. The results show that among the three repair processes,the quality of VARI repair process is the best. The static strength of the specimen repaired by VARI can be restored to 90. 3% of the intact specimen,and the fatigue life is 31. 4 times longer than that of the non repaired specimen;compared with the traditional wet bonding repair, the repair time can be shortened by 60. 2% by using VARI repair;compared with mechanical strengthening repair,VARI repair can reduce the increase of specimen weight by 53. 5% and increase the specific static strength recovery rate by 146. 6%;for the crack with a length of 20 mm,the patch length of 60 mm,the width of 64. 8 mm and the number of patch layers of 4 (the patch thickness of 1 mm)are the optimal patch parameters. © 2024 Cailiao Daobaoshe/ Materials Review. All rights reserved.
