Dynamic crack velocity and fracture toughness in concrete using two full-field measurement techniques: Effect of free-water
Résumé
In this study, two full-field processing methods were applied to analyse ultra-high-speed camera images recorded during rocking spalling tests to assess dynamic crack velocity and fracture toughness of concrete under different moisture conditions. The first method used Crack Opening Displacement (COD) based DIC processing, while the second employed Extended FEM-DIC analysis. Both techniques provided consistent results in terms of crack-tip position and propagation velocity. The rocking spalling approach utilised double-notched specimens loaded using a single-Hopkinson bar device. Digital Image Correlation techniques processed images acquired at 500 kfps. Mean crack velocities ranged from 900-1000 m/s for dry concrete and 1200-1300 m/s for saturated concrete. The critical stress intensity factor was consistently higher in saturated specimens, aligning with their increased strength and strain-rate sensitivity compared to dry specimens.
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