各向异性脆性材料动态断裂的实验研究

Here the dynamic method of caustics was used to study the stress dynamic fracture behavior of anisotropic brittle materials by considering anisotropic stress distribution near the crack tip. The stress intensity factor and crack length versus time, and the fracture toughness were obtained. Results show that the fracture toughness of the specimens after plastic compression are different from that uncompressed specimens. And the fracture toughness of specimens transversely cut and axial crack propagation(TA) were larger than that transversely cut and transversely crack propagation(TT). The fracture toughness increases with compressive strain increases. The reflective method of caustics can be applied to non-transparent materials, which could be extended to the dynamic fracture analysis of anisotropic brittle materials such as rocks.