In this paper

the mechanical properties of mid-temperature cured high toughness epoxy resin hybrid composites were investigated. Firstly

carbon fiber unidirectional prepreg

high-strength glass fiber unidirectional prepreg

and aramid fiber unidirectional prepreg were prepared by the hot-melt method

and a single prepreg layer and hybrid composites with different fibers were prepared by the autoclave method. Secondly

the tensile and compressive mechanical properties are tested and key performances such as stress-strain curve

strength

and stiffness were obtained. Finally

a theoretical model of equivalent tensile stiffness of hybrid fiber laminate composites was established and the Hashin strength criterion was introduced to evaluate the strength of the composites

the accuracy of which was verified by comparison with the measured values. The results showed that the interlayer mixing of different fiber prepregs allowed the hybrid composite to exert synergistic effects

optimize performance. The data obtained from the theoretical calculation model of the hybrid composite was close to the measured values

providing a theoretical basis for the strength design of the hybrid fiber.