Simulation And Optimization Of Mechanical Properties Of Carbon Fiber Composite Shaped Tubes

In recent years,with the continuous development of carbon fiber composites,carbon fiber composite shaped tubes with excellent mechanical properties have been increasingly used.However,there are few studies on the simulation of mechanical properties of carbon fiber composite shaped tubes,and there are not many studies on the effects of different structural models and fiber angles on the mechanical properties of shaped tubes.So this paper takes an octagonal carbon fiber composite shaped tube with a cross-sectional shape between round and square as the research object,and carries out mechanical properties research,model building,fiber angle optimization and mechanical properties comparison simulation to provide a basis for the actual performance of shaped tubes.The main research contents are as follows:Firstly,based on the laminate model theory,the laminate model of the profiled tube is established and simulated to verify.The shell model established by UG is imported into ANSYS,and the finite element model of CFRP profiled tube is established in the ACP(pro)module of ANSYS,and the axial compression and bending simulation tests are carried out.The results show that the load of the profiled tube when compressing the length of 2 cm in the axial compression test has exceeded 160 MPa,and the carbon fiber composite laminate profiled tube has better mechanical properties.Next,the control variable method was used to design the axial compression and bending mechanical property tests to optimize the lay-up angle.The commonly used layup angles of 0 degree,30 degree,45 degree and 60 degree were selected as the lay-up angles,and the mechanical properties were analyzed from the laminate as a whole and single ply respectively.The results show that the shaped tube with 45 degree pavement can better disperse the load and reduce the deformation during bending loading,and its bending performance is 4% higher than that of other pavement angles,and the shaped tube with 0 degree pavement can bear the load more effectively because the fiber direction is the same as the compression direction,and its axial compression performance is 23%higher than that of other pavement angles.Finally,the surface intersection method is used to establish the woven geometry model of the profiled tube and optimize the load calculation for the working condition,and the mechanical properties of the laminate model and the woven geometry model are compared under the working condition.The results show that the shaped pipe of both models can meet the working conditions,and the minimum value of safety factor is more than 1.5,which meets the requirement of safety factor.