In this article, the dynamic fracture of polymethyl methacrylate specimen with two symmetrical prefabricated notches was investigated by dynamic caustics experiment and distinct lattice spring model (DLSM). Three variables in respect of the pitch between these prefabricated notches, a = 10 mm, 15 mm, and 20 mm, were designed here. The failure form, crack propagation trajectory, crack propagation velocity, stress state at crack tip, ratio of damaged lattice, and load-displacement curve of the specimen under different working conditions were analyzed and compared. Results show that DLSM can invert the results very well. Finally, the impact factors (support constraints and heterogeneity) involved in this experiment were quantitatively analyzed by DLSM.
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