Topology Optimization Design Of Continuous Fiber Reinforced Composites For 3D Printing

With the ever-increasing demand for ultra-light and ultra-strong structures,the optimal design of continuous fiber-reinforced composite structures combining topology and fiber orientation has become a research hotspot.Past studies usually deal with the printing of continuous fiber-reinforced composites with discrete fiber orientations,but this method has an obvious disadvantage,that is,the discrete fibers in the topology cannot be directly used as fiber printing paths,making the structure difficult to fabricate.Based on this background,this paper considers the 3D printing path planning problem in the topology optimization design of the continuous fiber reinforced composite structure,and uses the streamline in the flow function to represent the printing path of the continuous fiber in the structure,in order to improve the structural performance while improving the reliability.productive.The main research content is as follows:Aiming at the problem of minimizing the structural flexibility of fiber-reinforced composite materials,based on the Floating Projection Topology Optimization(FPTO)method,the material distribution and direction of the structure are used as design variables,and the target volume fraction of the structure is constrained to propose a fiber Parallel optimization design method for structural topology and fiber orientation of reinforced composites.The fiber direction is determined by the principal stress method to ensure that the fiber direction is always consistent with the direction of the force,and the structural performance of the fiber-reinforced composite material is fully achieved.Aiming at the problem of the 3D printing path of continuous fiber reinforced composite materials,the fiber field is fitted based on the potential flow function theory.The isoline of the flow function is equivalent to the printing path of the continuous fiber to ensure that the printing path of the continuous fiber reinforced composite material structure is smooth,continuous,nonintersecting,non-overlapping,and unified with the structural load-bearing path,improving the reliability of the continuous fiber reinforced composite material.productive.Aiming at the collaborative optimization problem of continuous fiber reinforced composite structure topology and 3D printing path,the continuous fiber path planning algorithm is embedded in the FPTO optimization process,and the influence of structural topology,continuous fiber direction and volume on the continuous fiber reinforced composite structure is considered.Constrained by the structural target volume fraction and the structural target fiber material volume fraction,the continuity of the fiber direction and the optimal distribution of the fiber volume are guaranteed by solving the multi-constraint topology optimization problem,thereby greatly improving the performance and reliability of the continuous fiber reinforced composite structure.productive.