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A Finite Element Calculation Model Considering Geometric Defects in 3D Printing

A geometric defect and 3D printing technology, applied in the field of modeling and simulation, can solve problems such as limited prediction ability, calculation accuracy needs to be improved, and the model does not fully consider the distribution characteristics of geometric defects, so as to achieve close mechanical response and improve prediction accuracy Effect

Active Publication Date: 2022-07-12
BEIJING INSTITUTE OF TECHNOLOGYGY
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Problems solved by technology

[0004] Since the above models do not fully consider the distribution characteristics of geometric defects, the finite element model has a limited ability to predict the mechanical response of 3D printing lattice materials, and the calculation accuracy needs to be improved.

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  • A Finite Element Calculation Model Considering Geometric Defects in 3D Printing

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[0045] The present invention will be described in detail below with reference to the accompanying drawings and embodiments. At the same time, the technical problems and beneficial effects solved by the technical solution of the present invention are also described. It should be pointed out that the described embodiments are only intended to facilitate the understanding of the present invention, and do not have any limiting effect on it. Selected-area electron beam fusion technology is used to print lattice materials composed of simple cubic, face-centered cubic, and body-centered cubic combination of unit cells. The stacked grayscale image of the printed specimen was obtained by CT tomography, and the grayscale image was imported into the 3D reconstruction software Avizo to reconstruct the 3D digital model of the printed specimen.

[0046] The matrix material of the lattice material is Ti6Al4V alloy.

[0047] like figure 1 According to the length of the rod in the lattice ma...

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Abstract

The invention discloses a finite element calculation model considering geometric defects of 3D printing, which belongs to the field of modeling and simulation. In the modeling process of this method, the axis curvature of the lattice material rod and the distribution law of the cross-sectional size of the rod along the rod axis are considered. The finite element model modeled by this method can not only predict the deformation failure mode of the 3D printing lattice material, but also improve the prediction accuracy of the finite element model. It solves the problem that the existing finite element modeling methods do not fully consider the distribution characteristics of geometric defects. The invention is suitable for the fields of application materials and the like, and can test and analyze the 3D printing lattice material through modeling and simulation.

Description

technical field [0001] The invention relates to a finite element calculation model for 3D printing, in particular to a finite element calculation model for effectively considering geometric defects of 3D printing, and belongs to the field of modeling and simulation. Background technique [0002] The molding quality of 3D printing lattice materials is affected by different factors, such as printing process, printing direction, etc. Currently widely used metal 3D printing technologies mainly include selective laser melting and selective electron beam melting. The surface quality of the specimen obtained by laser selective melting technology is good, but there are pores inside. The samples printed by the selective electron beam melting technique have almost no pores inside, but the surface quality is poor. Therefore, the specimens obtained by 3D printing inevitably have geometric defects. Studies have shown that the existence of geometric defects can cause the actual mechani...

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): G06F30/23G06F113/10
CPCG06F30/23G06F2113/10Y02P10/25
Inventor 宋卫东于国际肖李军
Owner BEIJING INSTITUTE OF TECHNOLOGYGY
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