首先生成二维网格基面，选取三维场域的最复杂截面进行二维剖分，然后再将二维网格拉伸成三维网格。
A double-dimension grid is formed first, then the choosing complicated cross section is analyzed and last the three-dimension grid is formed by stretching the double -dimension grid.
在生成三维随机球形骨料模型的基础上，研究了形成随机凸多面体骨料模型的方法，并利用FORTRAN语言编制凸多面体骨料生成程序和细观有限元网格剖分程序。
FORTRAN program to generate random convex polyhedron aggregate based on the topology of spherical aggregates and the codes of the mesoscale structured finite element grids of concrete is developed.
第五章对三维有限元网格的生成方法进行了介绍，并指出三维有限元网格剖分的发展趋势和方向。
The fifth chapter introduces some three-dimensional FEM mesh generation methods, and points out the trend of them.
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