Short fiber reinforced composite material mechanical property prediction method based on CT scanning

Abstract

The invention relates to a method for predicting the mechanical property of a short fiber reinforced composite material containing pore defects based on CT scanning, and mainly solves the problem of low prediction precision calculation efficiency in the prior art. According to the scheme, the method includes: obtaining a short fiber reinforced phase, pore defects and microcosmic distribution of abase material through CT scanning; establishing an ellipsoidal simplified mechanical model according to the length and the spatial orientation of the short fibers; establishing a three-dimensional isoparameterized micromechanics model based on a finite volume direct average micromechanics method; equivalently homogenizing a short fiber reinforced phase and a pore defect two-component material, andcarrying out secondary equivalence on an equivalent model and a matrix component material to obtain a mesomechanics model; and obtaining anisotropic mechanical parameters of the composite material through the spatial distribution and the mechanical parameters of the component materials. According to the method, the prediction precision is improved, the calculation efficiency higher than that of the voxel inclusion theory is obtained, the time is saved, and the method can be used for testing and selecting new energy vehicles, aerospace and marine ship materials.

Description

technical field [0001] The invention belongs to the field of material technology, and in particular relates to a method for predicting the mechanical properties of composite materials, which can be used for material testing and selection of new energy vehicles, aerospace, ocean ships, and sports equipment. Background technique [0002] Short fiber reinforced composites refer to a class of composite materials in which short fibers are randomly distributed in space in the matrix phase. On the mesoscopic scale, due to the random distribution of short fibers in space, the distribution of mesoscopic stress field is often uneven. However, compared with traditional materials, this type of composite material shows excellent toughness and impact resistance. The molding process of short fiber reinforced composite materials is simple, and the output of sheet molding compound and bulk molding compound is extremely large in actual production. The use of polymer-based short-fiber composi...

AI Technical Summary

Problems solved by technology

However, this CT technology does not establish a model of the real structure of the reactive composite material, nor does it predict its mechanical properties.

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