Design method and structure of dot matrix sandwich structure for additive manufacturing

Abstract

The invention provides a design method and structure for an additive manufacturing lattice sandwich structure, relates to the technical field of additive manufacturing, and can provide a feasible design scheme for preparing the lattice sandwich structure by adopting an additive manufacturing process and expand the application scene of the additive manufacturing lattice structure. According to the method, an initial structure is assumed to be a solid structure for topological optimization, then the skin thickness of the initial structure is adjusted according to a topological optimization result, then a cavity part of the adjusted structure is filled with a dot matrix through dot matrix filling optimization, and design is completed. The optimization target of topological optimization is that the strain energy of the overall structure with the weight is minimum, and the constraint conditions comprise volume fraction constraint, minimum size constraint and/or maximum size constraint; the optimization target of dot matrix filling optimization is that the rigidity of the overall structure with the weight is maximum, and the constraint conditions comprise the total mass constraint, the dot matrix target length constraint, the minimum diameter constraint and/or the maximum diameter constraint.

Description

technical field [0001] The invention relates to the technical field of additive manufacturing, in particular to a method and structure for designing a lattice sandwich structure for additive manufacturing. Background technique [0002] The lattice structure is a kind of three-dimensional ordered porous structure, which is composed of periodic lattice unit cells. The functional regulation of the unit cell can be achieved through the design of the configuration and geometric size of the unit cell. The lattice structure is similar to the truss structure, which is composed of a large number of rod structures connected to each other in space, the difference is that the size of the lattice structure is much smaller. The study found that the lattice structure has higher specific strength and specific stiffness than the currently commonly used lightweight materials. At the same time, due to the large number of holes connected to it, it has good heat dissipation, heat insulation, v...

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Problems solved by technology

However, this invention only provides a structural design method suitable for gradient lattice, and does not propose a skin design method for th

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