Method for accurately reconstructing dissimilar material microcosmic finite element grid model on basis of CT (computed tomography) images

Abstract

The invention provides a method for accurately reconstructing a microcosmic finite element grid model of a dissimilar material on the basis of CT (computed tomography) images. According to the method, sequence CT images are acquired through industrial CT, and micro-structural information in the CT images is mapped onto the reconstructed finite element grid model on basis of digitization and threshold segmentation, so that any detailed structural information in the dissimilar material can be represented in the reconstructed model. The method improves the reconstruction accuracy by means of contrast-limited adaptive histogram equalization, median filtering and pixel interpolation, and improves the reconstruction efficiency through image cut and pixel combination. With the method, rectangular (two-dimensional) and cuboid (three-dimensional) unit grid models with higher finite element analysis accuracy are directly reconstructed, error accumulation during reconstruction, grid partition and other links of the existing geometric reconstruction method is avoided, and reconstruction accuracy and efficiency are improved. The method can be widely applied to fields such as performance prediction and optimization design of dissimilar materials.

Description

technical field [0001] The invention belongs to the technical field of finite element grid model reconstruction, and relates to a method for reconstructing a finite element grid model of a heterogeneous material, in particular to a method for accurately reconstructing a microscopic finite element grid model of a heterogeneous material based on a CT image. Background technique [0002] Heterogeneous materials composed of multiple components (such as composite materials, porous materials, etc.) are one of the most common materials in natural and synthetic materials, and the macroscopic properties of these materials (such as stiffness, strength, and toughness) are mainly determined by determined by its microstructure. Therefore, a thorough study of the effect of the microstructure of heterogeneous materials on their macroscopic properties is of great significance for the design and development of new high-performance heterogeneous materials. The finite element method is one of...

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Problems solved by technology

Because the model established by the existing geometric reconstruction method needs to be further divided into meshes, and the meshes based on complex surfaces or solids are mostly triangular or tetrahedral elements, the accuracy of finite element analysis is not high; in addition, the microstructure of heterogeneous materials The complexity limits the quality of the mesh, and relatively fine information in the material microstructure is easily lost during the meshing process

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