Parameterized finite element modeling method for concave hexagonal negative Poisson's ratio lattice structure

Abstract

The invention discloses a parameterized finite element modeling method for a concave hexagonal negative Poisson's ratio lattice structure. The parameterized finite element modeling method comprises the following steps: (10) obtaining independent design parameters: obtaining the independent design parameters of the lattice structure; (20) establishing a finite element model node numbering matrix: formulating parametric modeling node numbering rules and establishing a finite element model node numbering matrix; (30) establishing a node and a coordinate corresponding relation matrix thereof: defining a coordinate origin, and establishing a node-coordinate relation matrix of a lattice structure finite element model; (40) establishing a unit node relation matrix: formulating a parametric modeling unit numbering rule based on a beam unit, and establishing a corresponding relation matrix between a finite element model unit and a slave node thereof; and (50) compiling a calculation file: compiling the above steps into a script program, and outputting a Radios calculation file to realize parameterized finite element modeling. The finite element modeling method is high in modeling efficiencyand simulation precision.

Description

technical field [0001] The invention belongs to the field of periodic lattice material / structure finite element simulation analysis, in particular to a parametric finite element modeling method for a concave hexagonal negative Poisson's ratio lattice structure with high modeling efficiency and high simulation precision. Background technique [0002] Lattice structure with negative Poisson's ratio effect is a typical mechanical superstructure, which expands laterally when subjected to uniaxial tension (lateral contraction when compressed uniaxially). Accompanied by the unique auxetic (compression) phenomenon, the negative Poisson's ratio structure presents excellent properties such as porous light weight, high specific strength, impact resistance and heat insulation, which can not only meet the special needs of super-large structures such as load bearing, noise reduction, and cooling. Functional requirements can better meet the design concept of ultra-light structure on this ...

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Problems solved by technology

As a typical negative Poisson's ratio lattice structure, the concave hexagonal negative Poisson's ratio lattice structure has better load-bearing performance, but its microstructure is complex and there are many design parameters, so the optimal design must rely on finite element methods

[0004] At this stage, in the iterative process of lattice structure optimization design, it is necessary to continuously adjust the values ​​of independent design parameters and perform performance evaluation on the adjusted structure. Relying on manual adjustments will make the optimization efficiency low

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