Abstract：The dynamic fracture experiments to a single cleavage semi-circle(SCSC) specimen with the split Hopkinson pressure bar(SHPB) equipment were conducted in order to study the fracture behavior of pure mode I and mixed-model I/II cracks under dynamic loads. The crack propagation speed was measured with a crack propagation gauge system and a high speed photography system respectively. Several numerical models for the pure mode I and mixed mode I/II were established based on Drucker-Prager strength model and cumulative damage(CD) failure criterion. The crack propagation behavior was simulated with the code AUTODYN. The crack propagation paths predicated with the numerical simulation agreed well with the experimental results. The propagation speed was found not to be a constant. The crack propagation may stop，i.e. the phenomenon of crack arrest happened. The phenomenon was captured by the crack propagation gauge system and the high speed photography system. The results of the high speed photography system are visualized easily.
2016, Vol. 35 
