Method for predicting effective elastic modulus of short fiber composite material based on mesomechanics

Abstract

The invention discloses a method for predicting the effective elastic modulus of a short fiber composite material based on mesomechanics, and belongs to the technical field of material performance prediction. The implementation method comprises the following steps: based on a Mori-tanaka equivalent inclusion theory, establishing a three-dimensional finite element model based on mesomechanics; inputting parameters to obtain a strain field for matrix material performance and fiber material performance; calculating the effective elastic coefficient of the composite material by combining the average strain relationship of each phase of the composite material and the effective rigidity of the short fiber composite material, and predicting the effective elastic modulus of the short fiber composite material according to the relationship between the effective elastic coefficient and the effective elastic modulus of the composite material. The method can be applied to the field of optimizationdesign numerical simulation of the short fiber composite material and solves related engineering problems. The optimization design numerical simulation engineering application field of the short fiber composite material comprises ship propeller performance prediction, injection molding short fiber composite material performance prediction and short fiber composite material fan blade design application.

Description

technical field [0001] The invention relates to a method for predicting the effective elastic modulus of short fiber reinforced composite materials, which is suitable for predicting the mechanical properties of composite materials based on mesomechanics, and belongs to the technical field of material performance prediction. Background technique [0002] The short fiber composite material is a polymer composite material with resin as the matrix and various short fibers as the dispersed phase. Short fiber-reinforced resin-based composites do not have the characteristics of continuous fiber-reinforced composites in terms of strength, stiffness and fatigue resistance, but they have obvious advantages in terms of processability and production efficiency. Therefore, it is widely used in new energy vehicles, aerospace, marine ships, construction, sports equipment and other fields, and has broad development prospects and the possibility of replacing traditional metal and non-metal m...

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Problems solved by technology

[0003] At present, for the prediction of the elastic constant of composite materials, after years of research by domestic and foreign scholars, several different calculation formulas for predicting the effective elastic constant of composite materials have been proposed. Comparative experiments show that the axial modulus calculated according to these formulas and the axial The Poisson's ratio has sufficient accuracy and is in good agreement with the experimental values, but it is still difficult to predict the transverse elastic modulus and shear modulus

Mori and Tanaka solved the basic theoretical problems of using Eshelby's equivalent inclusion principle under the finite volume ratio. The Mori-Tanaka method is mathematically logical and complete, but the Mori-Tanaka method is only applicable to the compound whose inclusion is ellipsoid material, which cannot meet most engineering requirements and has strong limitations

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