Automatic Generation Of Finite Element Mesh Model For Composite Designed

Continuous fiber reinforced composites have been applied to engineering area extensively because of its good mechanical performance, but high cost and difficulty of fabrication limit the application. These limitations have fostered a renewed interest in Short-fiber or particulate reinforced composites, which like homogeneous materials, not only can be easily processed but also Show isotropic. They have the potential to be designed for specific applications which require a higher specific stiffness, greater strength and/or improved fracture properties than the traditional homogeneous material. As a result, researching particulate reinforced composites is very valuable to more extensive engineering application.A large number of experiment and research indicate that the microstructure of the composite material influences its macroscopic performance directly. As a consequently, reliable analysis and application requires an accurate characterization of the microstructure. and with the processing speed of digital computers and the techniques of parallel computing advancing rapidly, a 3-D Representative Volume Element(RVE) of a real composite microstructure can nowadays be characterized accurately by computer modeling and the mechanical behavior of composite materials can be learned and predicated by finite element analyzed. However During the research, because shapes of the microstructure are complex, it is very difficult to build finite element models for them. Lack of accuracy models brings big difficulty to the research and application of composites.In this paper combined CAD technology with FEM mesh generation technology, a method for building 3D finite element analysis models of particulate reinforced composites is proposed to provides an active way to build finite element models of composite.The primary thinking of the method is, generating the geometric model of composite microstructure based on Monte-Carlo method; meshing the geometric model surface using the Mapping approach to get a discrete expression; meshing the model using AFT to get finite element mesh.To the composite material with a good deal of random reinforced particles, The criteria of conflict overlap of any two ellipsoidal (or any two oval) aggregates is proposed based on a volume-index to build effective geometric model when the microstructure is simulated, which break through the efficiency bottleneck problem about geometric legality judgment; The polarization of mesh is resolved in the finite element surface mesh generation based ontraditional mapping approach coupled with local connection approach; The adavanced AFT method is applied to generate tetrahedron (trangle)mesh of basic body, and by utilizing the characteristics of AFT to generate the tetrahedron(trangle) mesh of all the grains only one time. The method proposed builds the foundation for the further multi-scale computation between microstructure and macro-mechanical performances of the multiphase composite.This paper based on AutoCAD platform and adopted the AutoCAD Runtime Extension programming environment ObjectARX and language tool Visual C++, to develop AutoCAD applications, extend AutoCAD classes and protocol, created new AutoCAD commands so as to build the microstructure geometric model of composite materials.