Surface Processing Effect on Fatigue Properties of Composite-Bonded Aluminum Alloy.

In this paper, the composite patch was prepared by wet spreading method, with which the damaged aluminum alloy specimen was repaired by bonding. The effects of different surface processing and curing modes on the fatigue properties of the specimens were studied. The results show that the surface coating coupling agent can significantly improve the fatigue properties of the repaired specimens; compared with unrepaired specimens, the fatigue life was increased by about 6.26 times and compared with uncoated specimens, the fatigue life was increased by 13.2–32.4%. Compared with unrepaired specimens, the fatigue life of repaired specimens can be increased by 6.20 times by heating and pressure curing. The fatigue life can be increased by 7.8–18.5% compared with normal temperature curing and repairing. Finally, the fatigue fracture of the specimen was observed and analyzed by SEM. [ABSTRACT FROM AUTHOR]