Numerical Simulation Of Concrete Mesoscopic Damage And Fracture

Because of its excellence, the material of concrete has being used for some years. The concrete being made up of bone and sand slurry is a kind of the nonlinear material. Due to the process of molding concrete initial stage' dryness and hydratability, there are a lot of initial cracks in the bone and sand slurry' combination. Many studies show that the nonlinear of concrete is caused by these cracks' crazing and expanding. The process of concrete' damage is involved in a great deal of the microcosmic mechanism, for example the close of cracks, crazing, fracture and so on. At present, the advantage of the microcosmic mechanics to study the process of concrete' damage and fracture is being noticed. Especially, the development of computer, it inaugurates the vast foreground to study the macroscopical mechanical problem from the mesoscopic mechanics.This paper is based on the understand of the concrete material. The mathematic model to study the process of concrete's damage and fracture is being put forward. At mesoscopic scale, concrete may be regarded as a three-phase composite consisting of coarse aggregate, mortar matrix and internal zones. Originality disfigurement of concrete being regarded initialized damage, the random distribution is based on the statistic Weibull's distribution. The mathematic model is built by this way. Many kinds of concrete models come into being. This paper's content is the numerical simulation of the draw and pressure to concrete, the draw to the one side crack concrete and three points bending girder's damage and fracture, moreover, the analysis of the dimension law of the three points bending girder. The study show that the model is close to the real samples and the precision of concrete nonlinear.