MECHANICAL BEHAVIOR OF COMPOSITE REPAIRED COMPONENTS UNDER CORROSION ENVIRONMENT

The center cracked LY12CZ aluminum alloy plates were adhesively bonded with composite patches, and the tensile strength, the fatigue life and the crack growth during fatigue under air environment and accelerated pre-corrosion environment were investigated experimentally. The experimental results show that both the static strength and the fatigue life of the repaired aluminum substrates are significantly increased for the bonded composite patches, and the short-term pre-corrosion environment does not have a notable effect on the mechanical performance of composite repaired components. Also, a simple fatigue crack growth life prediction model, based on Paris formula and Rose's analytical solution, is proposed to predict the fatigue behavior of the repaired plates under air and pre-corrosion environments. The result shows a good quantitative agreement with experimental data.