Study on Fracture Simulation Method of Brittle Material with Distinct Model

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The results obtained in this research are summarized as follows :1. The visco-elasto-plastic suspension element method for the fracture analysis was developed. Delauney triangulation was adopted to VEPSEM for the sake of stabilized numerical analysis with random placed nodal points, and repetitive loading was considered by the displacement control of the loading boards. Furthermore, in order to simulate the fracture of porous concrete, the arbitrary radius of suspension elements was set independently from the radii of the aggregate nodes concerned with the element.2. The stress-strain curves and the progress of fracture of two dimensional concrete specimens were simulated and discussed under various conditions of loading speed, shape and size of specimen, and position of coarse aggregate. Furthermore, the stress-strain curves of confined concrete were also simulated and discussed.3. The elastic wave of acoustic emission by local fracture of concrete were simulated and discussed from the view points of the difference between tensile and shear fracture and the mechanism of Kaiser effect. The phenomena of acoustic emission were simulated adequately.4. The fractures of porous concrete were simulated. As the result, it was clarified that there are no differences between the progress of simulational fracture of porous concrete and solid concrete, and the relationship between compressive strength and void ratio of the simulational results has same tendency from previous experimental study.