Parameterized mesh generation method for unidirectional composite material mesoscopic finite element model

Abstract

The invention discloses a parameterized mesh generation method for a unidirectional composite material mesoscopic finite element model. The method is characterized by comprising the following steps of: establishing the unidirectional composite material mesoscopic geometric model comprising a matrix, an interface layer and fiber monofilaments; dividing the mesoscopic geometric model into an external matrix area and an internal square block area; segmenting the internal square block body area; and defining a division parameter represented by the number of segments as a reference of the mesh division density of the model so as to control the overall mesh density and the like of the model. According to the method, the divided grids are regular in shape and approximate in size, so that the accuracy of a finite element calculation result can be ensured; orderly change of grids in each region is guaranteed through introduced division constraints, the situation of grid change imbalance is avoided, and the calculation stability can be improved; meanwhile, the unified control of the overall grid density of the model is realized by taking a shared division parameter as a reference, and the adjustment efficiency of the grid density of the model is high.

Description

technical field [0001] The invention belongs to the technical field of composite material modeling, and in particular relates to a parametric grid division method for a unidirectional composite material mesoscopic finite element model. Background technique [0002] The mechanical behavior of composite materials is closely related to its mesostructure, so it is of great significance to study the influence of mesostructure on its mechanical behavior. Due to the complexity of the mesoscopic structure inside the composite material, the cost and workload of studying the influence of the mesoscopic structure on its mechanical behavior through the experimental method are relatively high, and because it is difficult to prepare a test sample with a specific mesoscopic structure, it is impossible to obtain a comparative analysis. Comprehensive analysis results. [0003] In the prior art, the above problems are generally solved by numerical analysis methods. Firstly, mesoscopic finite...

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Problems solved by technology

However, the shape and density of the finite element mesh can have a large impact on the calculation results

This effect is greater for the mesoscopic model of composite materials, because there are obvious differences in the shape and size of each part in the mesoscopic structure of composite materials. The shape varies greatly, it is difficult to ensure the orderly change of the grid in each area, and it is difficult to choose the appropriate grid size

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