| As the traditional construction material, concrete is used a great deal and widely. In-depth studies are going on for it will not be substituted at present. It is developed from large-scale objective model experiment to reduced scale model experiment; from simple mechanics device to various advanced detecting device; and the theory is developed from elastic mechanics, plastic mechanics to fracture mechanics and damage mechanics. The study of concrete fracture has also developed from macro-Level to meso-Level.A new material design viewpoint is proposed in this paper, which is based on the fracture mechanics through simulation. At first, ploygon aggregate structure of concrete is randomly generated in two-dimensional plane with Monte Carlo method on the meso-level. Then, the growth process of a crack of concrete 3-point bending beam specimen is analyzed by FEM, according to the criterion of maximum circumferential tensile stress. And the path of crack to spread in mortar, aggregate and interfaces of them is gained by the ultimate fracture criteria in construction standard that the width of crack should not be more than 0.2mm. The result of FEM was verified by mature software ANSYS. This numerical simulation is a primary attempt to design material with computer simulating analysis. We can find the best combination by change parameters, such as aggregates' diameters, rate of aggregates volume and gradation, to finish the material design. |
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