Prediction and test verification of mechanical properties of fiber reinforced composites

For the problem of predicting mechanical properties of unidirectional fiber reinforced composite with uniform arranged fiber, based on the composite micro-mechanical finite element method, the representative volume element (RVE) model with periodic boundary conditions was researched and established, the basic mechanical properties were realized. By comparing simulation results of B/Al fiber reinforced composites which obtained by applying the RVE model with test results and analytical solutions, it showed that prediction of the mesoscopic mechanical model with periodic boundary conditions kept a preferable consistency with test results and analytical solutions, and the efficiency of the RVE model was proved. Based on the mechanical properties test of unidirectional fiber reinforced SiC/TC4 composite sheets, the longitudinal/transverse elastic modulus and Poissons ratio of different layup structures were obtained, and the error between the calculated longitudinal/transverse elastic modulus and the mean value of the respective test values was less than 5%, the comparison of structural mechanics properties predicted results showed that the parameters of elastic mechanics agree well and the calculation model was reasonable.