Fluid finite element-based large-deformation elastomer product static stiffness calculation method

Abstract

The invention discloses a fluid finite element-based large-deformation elastomer product static stiffness calculation method. The method comprises the steps that a fluid model is built according to anoverall area obtained before and after an elastomer material of a target product deforms; the fluid model is subjected to fluid mesh generation, and parameters of the built model are given to the elastomer material in fluid units; on the basis, an initial distribution area when the elastomer material does not deform is obtained through partitioning, wherein the initial area is set to be the areawhere the elastomer material is distributed, and the other remaining area is set to be the area where the elastomer material is not distributed; after a model of the elastomer part of the product is built by means of fluid finite elements, the other part of the product is modeled according to a classical continuous solid mechanic finite element technology through the steps of contact setting, boundary condition setting and load setting, and then model building of the overall product is completed; and the displacement and the related constraint reaction of the product are calculated and jointlysolved, and then the static stiffness of the target product can be obtained. According to the method, the static stiffness of the elastomer product can be solved under any large elastomer deformationoperating condition.

Description

technical field [0001] The invention relates to elastic body products, static stiffness calculation technology under the condition that the structure and shape of the elastic body part are subject to large deformation, and in particular to a method for calculating the static stiffness of large deformation elastic body products based on fluid finite elements. Background technique [0002] During the load-bearing process, elastomer products for certain purposes often show a load-bearing effect of extremely large deformation. During the static stiffness analysis of such products, due to excessive deformation, some mesh elements of the elastic body will be severely distorted and deformed, which makes the solution of the finite element calculation impossible. [0003] At present, there are three main technical methods to solve the static stiffness calculation of large deformation of elastomer products: [0004] The first method: reasonable grid layout technology. According to t...

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Problems solved by technology

[0008] The technical problem to be solved by the present invention: Aiming at the above-mentioned problems of the prior art, a method for calculating the static stiffness of large-deformation elastic body products based on fluid finite elements is provided. In the finite element analysis, the present invention regards the solid material of the elastic body as " Using fluid elements and corresponding fluid analysis methods to solve the static stiffness of elastic body products can fundamentally overcome the shortcomings of solid elements and solid continuum analysis methods, and essentially solve the problem of large deformation of solid grids in finite element calculations. Convergence problem, to solve the static stiffness of elastic body products under the condition of arbitrarily large deformation

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