Continuous fiber 3D printing path planning method based on parallel optimization of fiber orientation and structure

Abstract

A continuous fiber 3D printing path planning method for parallel optimization of fiber orientation and structure, constructs a parallel optimization model of fiber orientation and composite material structure, takes material density and fiber angle as design variables, and filters them to obtain parallel optimization of fiber orientation and composite material structure Structure: discretize the complex optimized structure into a structure of simple geometric shapes, use topology to abstract each sub-region into points, and connect the points according to the positional relationship of the optimized structure to which the sub-region belongs to form a connection containing the characteristic information of the optimized structure Graph, the path planning is classified as finding the Hamiltonian path in the connected graph; the material density value is used as the weight factor of the fiber angle to obtain the direction of the fiber trajectory in each sub-region of the optimized structure; the sub-region printing paths are sequentially connected according to the Hamiltonian path , to generate a printing code; the invention exerts the anisotropic mechanical properties of the continuous fiber reinforced composite material and meets the requirements of the 3D printing process.

Description

technical field [0001] The invention belongs to the technical fields of structural optimization, composite materials and additive manufacturing, and specifically relates to a continuous fiber 3D printing path planning method for parallel optimization of fiber orientation and structure. [0002] technical background [0003] Continuous fiber reinforced composites, as an anisotropic material, are important materials for the manufacture of advanced structures. The 3D printing process of continuous fiber-reinforced composites breaks the constraints of traditional molding and laying technology on the fiber angle direction, and prints the model with path planning information, which can realize fine control and free design of fiber orientation. Using the similar principle of fused deposition modeling (FDM) technology, the fiber dry filament and thermoplastic filament are impregnated online and printed through the printing nozzle, and its mechanical properties change according to the...

AI Technical Summary

Problems solved by technology

However, this structure optimization method supports arbitrary shape output as the optimization result, and the result is not directly feasible. The traditional 3D printing path planning method cannot simultaneously realize the macroscopic topological geometric characteristics and microscopic fiber orientation of the optimized structure, and there will be problems in the printing process. Problems such as too small corners, path jumps, and path overlaps seriously affect the mechanical properties of the optimized structure and limit the development of continuous fiber reinforced composite 3D printing technology

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