Conformal lattice material design method based on finite element mesh
A design method and finite element technology, applied in the field of material structure optimization design, can solve problems such as damage to the integrity of lattice structures and inability to match complex outer contours
Pending Publication Date: 2022-03-25
SHANGHAI JIAO TONG UNIV
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Problems solved by technology
[0004] In view of the problem that the 3D printing dot matrix material uses Boolean operation to cut the outer contour to destroy the integrity of the dot matrix structure and thus cannot match the complex outer contour. The purpose of the present invention is to provide a conformal dot based on finite element grid Array material design method, the obtained conformal lattice material is used to generate a conformal truss structure that can match the complex outer surface of the object, and realize the integrated transformation of lattice material from material to structure
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Embodiment 1
[0052] In this embodiment, the three-dimensional torus is used as an example. First, draw a hexahedral grid on the CAD model of the three-ring annulus, and then add a BCC unit cell ( Figure 4 A) The corresponding truss and get the data in .inp or .obj format of the truss structure, and convert the truss ( Figure 4 B) becomes a beam with a certain diameter ( Figure 4 C).
Embodiment 2
[0054] In this embodiment, the three-dimensional torus is used as an example. First, draw a hexahedral grid on the CAD model of the three-ring annulus, and then add an FCC unit cell ( Figure 5 A) The corresponding truss and get the data in .inp or .obj format of the truss structure, and convert the truss ( Figure 5 B) becomes a beam with a certain diameter ( Figure 5 C).
Embodiment 3
[0056] In this embodiment, the three-dimensional torus is used as an example. First, draw a hexahedral grid on the CAD model of the three-ring annulus, and then add a Cubic unit cell ( Image 6 A) The corresponding truss and get the data in .inp or .obj format of the truss structure, and convert the truss ( Image 6 B) becomes a beam with a certain diameter ( Image 6 C).
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The invention discloses a finite element grid-based conformal lattice material design method, which comprises the following steps of: performing hexahedral grid division on a three-dimensional entity to realize unit discretization, rotating and deforming unit cells according to shape function interpolation, and filling the unit cells into conformal units to form a conformal truss structure, and generating three-dimensional space coordinates of nodes at the two ends of all beams, merging and re-numbering overlapped nodes of the conformal truss structure, exporting in a. Inp or. Obj file format, performing beam unit loading simulation in a finite element, generating a. Stl or. Obj file format, and exporting to obtain the conformal lattice material. According to the method, hexahedron finite element grid division is conducted on the complex structure through the finite element grids, the grid density is controllable, the size of the obtained. Stl or. Obj file is much smaller than that of the Boolean operation, the method is used for generating the conformal truss structure, the conformal truss structure can be matched with the complex outer surface of an object, and integrated transformation of the lattice material from the material to the structure is achieved.
Description
technical field [0001] The invention belongs to the technical field of material structure optimization design, in particular to a method for designing conformal lattice materials based on finite element grids. Background technique [0002] Lattice material is a concept of lightweight structural material jointly proposed by Professor Evans of Princeton University, Professor Hutchinson of Harvard University and others around 2000. Compared with foam material, lattice material has an ordered microstructure. Geometric features, more designable. Three-dimensional lattice materials are internationally recognized as a new generation of advanced lightweight super-tough materials. Some lattice materials have special properties and are called metamaterials. In 2006, Professor Ashby of the University of Cambridge further expanded the definition of lattice materials after more than ten years of research on lattice materials, and limited the structural unit scale of lattice materials to...
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IPC IPC(8): G06F30/23G06F30/10G16C60/00
CPCG06F30/23G06F30/10G16C60/00
Inventor 钟豪章莫翰轩王淑侠顾剑锋
Owner SHANGHAI JIAO TONG UNIV