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Lieu CentraleSupélec, Amphi sc.046 (Peugeot), Bouygues
Revisiting dynamic failure of brittle materials using ultra-high speed high resolution imaging
Résumé
Crack propagation requires high resolution imaging devices to be analyzed using full-field measurements. For analysing dynamic failure, this is a critical issue as usual mono sensor cameras decrease their resolution as their frame rate increases. As an alternative, we use a Cordin 580 multi-sensor camera that allows for acquiring 78 frames of 8 Mpixel up to a frame rate of 4,000,000 frames per second. After developing a dedicated strategy for displacement field measurements using this camera, we have been able to analyse dynamic crack propagation in PMMA. Experiments were performed using a gaz gun and dynamic crack propagation and branching was observed. Analysing these data, we proposed a branching criterion based on usual LEFM concepts allowing to capture the observed failure scenarios. The criterion is further validated on results obtained by dynamic phase field fracture simulations.
Lien de connexion : Zoom, ID de réunion : 867 9067 3262, Code secret : 463896