The single cleavage semi circle compression (SCSCC) plate specimens of sandstone,which are the sample of improved rectangular plate,were subjected to the split Hopkinson pressure bar.The model Ⅰ and mixed model Ⅰ Ⅱ rock dynamic fracture tests were conducted，the numerical simulation under the same condition with that of experiments was analyzed,and the failure modes for both tests and simulation were studied.Meanwhile, the crack arrest was also studied.The results showed that during the crack propagation,the model Ⅰ crack grew towards the right of the specimen which along the original direction,and the mixed model Ⅰ Ⅱ crack grew towards the axis of symmetry(maximum stress zone) of the specimen,meanwhile, the crack arrest phenomenon can be observed.Strain gauge method was an effective way to monitor the failure time.It was feasible to solve the dynamic destruction of rock materials in numerical simulation by using the modified maximum principal stress criterion and crack softening (CS) failure criterion,in additions,it described the complete stress strain failure process of material.The SCSCC specimens of mixed model Ⅰ Ⅱ had obvious advantages in the field of crack arrest.And because it was a large dimension specimen,it can reduce the effect that caused by the non uniformity of the rock.
