A Finite Element Analysis Method for the Deformation Mode of Lattice Material

Abstract

The invention discloses a finite element analysis method for a lattice material deformation mode, and belongs to the technical field of material mechanical performance analysis. The method includes establishing the finite element analysis model of the lattice material deformation mode, which sequentially includes creating parts, creating properties, assembling parts, creating analysis steps, creating field output variables, defining boundary conditions, dividing meshes, submitting calculations, and postprocessing Composed of sub-step units, a secondary finite element analysis is performed on the field output variable NFORCSO in ABAQUS / Standard mode, where the axial force, bending moment and shear force of the beam unit correspond to the tensile, bending and shear deformation modes, respectively, Obtain the strain energy caused by the three deformation modes of beam elements: tension, bending, and shear. The strain energy of the three-dimensional structure of the lattice material is the sum of the strain energies of all beam elements, which can realize the deformation of the lattice material during compression. Pattern quantification and visualization.

Description

technical field [0001] The invention belongs to the technical field of mechanical performance analysis of materials, and in particular relates to a finite element analysis method of a lattice material deformation mode. Background technique [0002] 3D printing technology has promoted the development of lattice material structure design and preparation technology. Since the successful preparation of lattice materials by 3D printing process in 2005, more and more complex lattice materials such as rods, plates and curved surfaces have emerged as the times require. pregnancy. Lattice materials have three deformation modes: stretching, bending, and shearing deformation modes, in which stretching deformation is the most efficient and bending deformation is less efficient. [0003] In the prior art, the Gibson-Ashby model and analytical model are mainly used to evaluate the deformation mode of lattice materials. The Gibson-Ashby model simply and generally divides lattice materials...

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Problems solved by technology

Lattice materials have three deformation modes: stretching, bending and shearing deformation modes, where stretching deformation is the most efficient and bending deformation is less efficient

[0003] In the prior art, the Gibson-Ashby model and analytical model are mainly used to evaluate the deformation mode of lattice materials. The Gibson-Ashby model simply and generally divides lattice materials into tension-dominated and bending-dominated lattices according to the Maxwell equation. material, but ignores the bending and shearing deformation modes of stretch-dominated lattice materials and the tensile and shearing deformation modes of bending-dominant lattice materials, the Maxwell standard can only qualitatively determine which deformation mode the lattice material is , and it is a necessary and insufficient condition, which cannot realize visualization and quantitative analysis, and lacks a specific guiding route; the analytical model needs cumbersome and complicated mechanical derivation of the lattice material, and it is also impossible to determine which part and where in the structure of the lattice material. Visual analysis based on a deformation mode

At present, there is a lack of methods to quantitatively and visually evaluate the deformation mode of lattice materials, and the evaluation of deformation modes can guide the design of lattice materials dominated by tensile deformation modes, so as to obtain high-strength and high-rigidity lattice materials

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