Abstract: In this paper, the composite materials of carbon fiber and glass fiber reinforced 2597PT unsaturated resin were fabricated. In combination with the actual use of yacht under the marine environment, the salt fog purple diplomatic aging test is carried out by artificial accelerated aging method, and its performance evolution rules under this aging environment are studied. The residual strength model is established and the residual strength of composite materials is predicted. The results show that with the increase of the aging period of the salt fog and purple, the chromatic aberration of the material becomes larger and the surface is yellow. The mechanical properties of the composite gradually decrease, and the decrease is more obvious in the early age of aging. Based on the residual strength theory of Gunyaev, the residual tensile strength formula of the composite is S=S₀+14.13(1-e^-0.61t)-9.16ln(1+2.49t), and the correlation coefficient R²=0.997. According to the requirements of CCS "Materials and Welding Code", we can predicte that the material can be used for about 30 years under the above conditions.

Key words: carbon-glass fiber reinforced composite reinforced composites, salt fog purple diplomatic aging, mechanical performance, prediction of material