《Tab.1 Dynamic mechanical and optical properties of PMMA[15]》

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《Propagation and Coalescence of Blast-Induced Cracks in PMMA Material Containing an Empty Circular Hole Under Delayed Ignition Blasting Load by Using the Dynamic Caustic Method》

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Ed-Young's modulus，νd-Poisson's ratio，Ct-Stress optical constant，C1-Longitudinal wave speed，C2-Shear wave speed.

PMMA was employed as the specimen material in this experiment.The dynamic mechanical and optical properties of PMMA are listed in Tab.1.The specimen dimension is 400mm×300mm×5mm in length×width×thickness，as shown in Fig.3.There are two notched boreholes with the same diameter of 6 mm，and the distance between the center of these two boreholes is 120 mm.In the middle position of the notched boreholes，an empty circular hole with a diameter of 6mm is situated.By such an arrangement in the specimen，the directional-fracture-controlled blasting can be realized and the crack propagation is easily ensured to be consistentwiththenotchedlocations after the explosion of the charge.The time differ-ence of detonation in the delayed blasting was set to13.33μs and the frame rate of the high-speed camera was 3×105 frame/s.The resolution of the photograph recorded was 256×64 pixels and the spatial resolution was 1.8 mm/pixel.The laser power was set to 60 mW.The charge mass in each notched boreholes was 140 mg.