Finite element analysis method for lattice material deformation mode

Abstract

The invention discloses a finite element analysis method for a lattice material deformation mode, and belongs to the technical field of material mechanical property analysis. The method comprises the steps that a finite element analysis model of the lattice material deformation mode is established, the finite element analysis model is composed of sub-step units which sequentially comprise component creating, attribute creating, component assembling, analysis step creating, field output variable creating, boundary condition defining, grid dividing, calculation submitting and post-processing, secondary finite element analysis is carried out on the field output variable NFORCSO under the ABAQUS / Standard mode, wherein the axial force, the bending moment and the shearing force of the beam units correspond to stretching, bending and shearing deformation modes respectively, strain energy caused by the stretching, bending and shearing deformation modes of the beam units is obtained, and the strain energy of the lattice material three-dimensional structure is the sum of the strain energy of all the beam units, and the quantitative and visual effect of the deformation mode of the lattice material in the compression process can be achieved.

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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