标题：NUMERICAL SIMULATION OF CRACK PROPAGATION OF BRAZILIAN DISK WITH CENTRAL CRACK UNDER COMPOSITE FRACTURE CRITERION USING IN TIGHT RESERVOIR DEVELOPMENT
摘要：In order to study the crack propagation law and stress variation process of Brazilian disc with central crack under uniaxial stress under composite fracture criterion, based on the M integral theory and the criterion of maximum energy release rate, the crack propagation of a Brazilian disc with a central crack at different angles under uniaxial stress is numerically simulated by using Franc3d software. The crack propagation process, the change of stress intensity factor and the stress cloud diagram are obtained and compared with the experimental results. The results show that the numerical simulation software Franc3d has high accuracy and accuracy in the calculation of crack growth. The prefabricated crack propagation starts along the prefabricated crack tip, and then propagates along the direction of the maximum principal stress, and finally breaks through the specimen. And the firsttype stress intensity factor reaches the maximum in the middle of the crack, and the first-type stress intensity factor reaches the minimum at the intersection of the crack and the specimen. The first type stress intensity factor decreases with the increase of prefabricated crack angle, while the second type stress intensity factor increases at first and then decreases with the prefabricated crack angle. The research results provide a certain reference for the correct understanding of rock crack propagation and fracture law. Future works should focus on the effect of the environmental contributions on the process of crack propagation. The research results can provide reliable reference significance for the development of tight oil and gas energy.
