Abstract
In order to study the influence of the change of the inclination angle of parallel double slits on concrete disk under dynamic load, we establish a three-dimensional dynamic numerical model of the flattened Brazilian disc by using finite element method. Non-uniform distribution of concrete materials has been realized in the model by adopting Weibull statistical theory. Moreover, we study the effect of variation of dip angle of parallel double slits on crack propagation pattern under stress wave, and obtain both diagrams of the complete failure process and acoustic emission of crack initiation, propagation and penetration. The results show that the failure of the specimen is cleavage and the direction of new crack growth is consistent with that of the dynamic load, the acoustic emission activity decreases with the increase of the dip angle of the prefabricated slits; the bigger the dip angle of prefabricated parallel double slits is, the bigger the peak load is, and the less the accumulated energy of acoustic emission is, the less likely the specimen is to be damaged.
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