Optimization design for laminate scheme of fiber reinforced composite shaft

Based on micro mechanics finite element method, the improved micro mechanics model of the representative volume element (RVE) was used to predict effective mechanical properties of continuous fiber reinforced metal matrix composite. Then square diagonally arranged RVE model was used to calculate its mechanical performance, which was better than that of quadrilateral RVE model. Taking continuous fiber reinforced metal matrix composite shaft as research objects, a micro and macro mechanics model of continuous fiber reinforced metal matrix composite shaft was built. The carrying capacity of this shaft, the rule of shaft carrying capacity, critical buckling load, and critical speed under the influence on different arrays between fiber and matrix were calculated. On this basis, in order to achieve optimization design about laminate scheme of continuous fiber reinforced metal matrix composite shaft, total thickness was taken as objective function with design condition of an aero-engine, and laminate scheme from micro RVE to macro shaft was obtained by random design method.Result shows that, use square diagonally arranged RVE model to calculate the mechanical performance is better than that of quadrilateral RVE model. Fiber and matrix is square diagonally arranged shaft carrying capacity, the critical buckling load and critical speed can be improved. The scheme is the same as GE(General Electric) Company SiC/Ti low pressure turbine shaft layer solution.