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论文类型：期刊论文

发表时间：2022-06-29

发表刊物：计算力学学报

卷号：27

期号：5

页面范围：887-894

ISSN号：1007-4708

摘要：A serial sectioning method is applied to capture surface images of
   quasi-brittle material. Digital image techniques are used to
   characterize the heterogeneity from surface images of raw material and
   then the characterized heterogeneity is transformed into vectorization
   mesostructures. With the assumption that the surface of each section is
   a representation of the inner structure within a small depth,
   vectorization meso-structure of each section extends a very small
   distance along the normal direction to form a layer of 3D cubical
   mesostructures and the 3D actual mesostructures of the specimen are
   formed by overlapping these serial layers. And according to the
   characteristic of surface images of quasi-brittle material,a code for
   processing a batch of images and vectorizing the mesostructure
   characterized by digital image techniques is developed and the data
   interface with 3D FEM grid is established. The data of grid model with
   actual mesostructure is directly imported into three-dimensional rock
   failure process analysis code(RFPA3D),so the influence of actual
   mesostructure on failure behaviors can be studied in detail under
   external loading. Here, agranular material specimen is taken as an
   example to demonstrate the procedure of the 3D mesostructure
   establishment. Then cracking process of granular material under uniaxial
   compression loadings in 3D space is simulated. The results show that
   grains distribution has a significant influence on fracture patterns of
   granular materials under external loadings

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