| As a new type of material, composite materials have a wide range of applications due to its excellent performance and the designability in a number of areas. With the development of composite applications, the performance requirements of composite materials also become higher and higher, and it has an important significance in the design of high-performance, special performance new advanced composite materials. With the development of computer visualization techniques and numerical calculation method, the microstructure of the composite in visual presentation can be achieved. The composite micromechanics employed by finite element analysis can study mesoscopic stress field and quantitative description of the relationship of composite mesostructure and performance, clarify the law of composite material properties, and guide the design of composite materials. This will greatly promote the development of composite materials. The trends of composite structure performance research is the use of digital, numerical, virtualization, visualization techniques to establish the microstructure of the composite structure visualization simulation, performance prediction, performance-oriented design integrated simulation platform.Based on the current development of the composite structure performance, this paper tried to use the digital materials technology as the pilot to design and build a composite microstructure. As a means of visualization technology, visual presentation was demonstrated the composite microstructure. As the core of the numerical material technology, the composite material microstructure the meso-results effective performance can be calculated and predicted.Laguerre diagram can be used for simulation polycrystalline materials microstructure. This paper discussed the algorithm of Laguerre diagram construction, and researched the point-by-point with the weight point set regular triangulation insert incremental algorithm and regular triangulation and Laguerre map to achieve dual conversion process to complete structure Laguerre diagram. This paper discussed the polycrystalline material microstructure by control the weight point set. By design of weight point set with sphere packing algorithm, it will not only achieve the model fitting of polycrystal microstructure, but can also complete the simulation polycrystal microstructure having particular grain size distribution. This paper also discussed the method of spatial transformation, which can be used as generate directional solidification of a polycrystalline microstructure, and can also be used to construct nano-crystalline grain boundary. After Completed design geometric morphology, the paper also described simulation and design method of grain crystallographic orientation.Another research point in this study is the enhanced phase characterization of microstructure by computer. This paper described the technical processes which enhanced the simulation phase microstructure by Monto-Carlo methods. Based on the interval [0,1] of the uniformly distributed random number generator, the random number generator with any uniform distribution, normal distribution and the exponential probability distribution was given to generate a variety of geometric morphology enhancers with geometric characteristics of orientation distribution, the spatial distribution of information and data. Based on the direction of the bounding box, geometric intersection detection algorithm was used at the same time, this not only can be quantitatively clarified to enhance the mutual positional relationship between the control and design of the positional relationship between the bodies, can also implement enhanced. There are three way to enhance the design of phase microstructure structure in this paper:(1) the combination of object geometry design for enhanced;(2) the design of enhanced random number parameter phase composed of animal characteristics and orientation of the object geometry (3) the design of the divided space based on the combination. Employed one method alone or in combination of these three methods, it can be obtain a variety of enhanced phase microstructure based on simulation.After finishing the simulation of composite matrix phase and the reinforcing phase, this study described the interface simulation from the geometric point. The interface phase was seen as shell structure had the same thickness which coated on the reinforcing body, then processed sequentially sub-layer region on the interface phase and constructed the hierarchical structure which can be used for represent the characterization of interface phase micro structure. Pores and inclusions of composite material also studied in this paper, the simulation method of two defect characterization distributed at the interface and at the random parts was also discussed. Combined with the matrix phase of construct, the design of reinforcing phase and interface phase of construct, the paper gave the simulation example of the particle reinforced, fiber reinforced and fabric reinforced composite material microstructure.The finite element mechanical analysis of composite material microstructure is based on the establishment of the composite microstructure with the numerical calculation of the geometric model of the representative volume element. Therefore, after secondary development of the pre-treatment of the ABAQUS, the geometric modeling and meshing program applies to polycrystalline structure and enhance phase was written, respectively, in order to achieve the automated modeling of composite material microstructure. Particle reinforced polycrystalline composite microstructure mesoscopic stress field was calculated by using the cell automatic identification technology and the homogenization processing method. Based on the definition of finite element method, six groups of the periodic boundary conditions of uniform strain is applied on representative volume element of the composite material, and obtained the stiffness of the matrix of the composite material. And then, engineering elastic constants of fabric reinforced composites was predicted. In this paper, the equivalent thermal expansion coefficient of the composite was predicted. The forecast result was in good agreement with the predictions of the finite element results and the experimental data. This indicated that the finite element analysis model was accuracy to verify the validity of the prediction method.After the above work has been completed, this paper researched the composite microstructure simulation and performance prediction integration technology. The simulation module interface program was taken on the microstructure of composites materials and designed the software for simulation module. Based on ABAQUS secondary development of the script, such as automated geometric modeling, meshing, anisotropic material given boundary conditions and load application, the results of extraction and calculation process, it could automate the simulation and prediction the integration representative volume element of the composite microstructure. In addition, the Python language was employed to development of graphical user interface, then designed input dialog of simulation module parameter. Simultaneously, software was combined with PyOpenGL programming, the preparation of a three-dimensional visualization program demonstrated demo composite composition microstructure. The software uses an external data file transfer simulation parameters indirectly, this could achieve the main graphical user interface, three-dimensional visualization window, a seamless transition between the self-development programs, and ABAQUS script calls. Furthermore, the numerical simulation software VirtualTPS of the composite microstructure was developed in this study, and provided the basic tools for composite structure-performance. |
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