基于 3D-ILC 含三维内裂纹孔口脆性固体断裂特性试验

The stress analysis of a circular hole problem is one of the classical problems in mechanics field. With the development of fracture mechanics, the research on the problem of the hole with cracks has been deepened, however, most of the previous studies focused on the two-dimensional problem or a hole with surface cracks. The study on the orifice problem with three-dimensional internal cracks has been relatively researched. Firstly, the internal crack with 60 angle was formed in brittle materials with circular hole based on the 3D-ILC method, without any effect on the surface. The uniaxial compression test was performed on the specimens with internal crack, birefringence effect of optical medium was used. The experimental results are compared with the existing literatures, and the theoretical and numerical simulation studies are carried out. Results show that (1) Compared with traditional methods, 3D-ILC has more advantages. (2) The main crack shapes of intact samples are primary crack and remote crack. (3) For the samples with internal crack, the main crack shapes are wing crack, secondary crack, reverse wing crack, reverse secondary crack, vertical twist crack and primary crack. (4) The ultimate failure load of the specimen with crack is 76.49% of the intact specimen, while the crack initiation stress is 96.72%. (5) The simulation results are in accordance with the experimental conclusions. The results would provide experimental support for the corresponding theoretical research.