The popsicle-stick cobra wave
Résumé
The cobra wave is a popular physical phenomenon arising from the explosion of a metastable grillage made of popsicle sticks. The sticks are expelled from the mesh by releasing the elastic energy stored during the weaving of the structure. Here we analyse both experimentally and theoretically the propagation of the wave-front depending on the properties of the sticks and the pattern of the mesh. We show that its velocity and its shape are directly related to the recoil imparted to the structure by the expelled sticks. Finally we show that the cobra wave can only exist for a narrow range of parameters constrained by gravity and rupture of the sticks.
Domaines
Mécanique [physics]
Fichier principal
cobraFinal.pdf (1.15 Mo)
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1_Cobra-Wave_1000fps_type-1-sticks.avi (8.91 Mo)
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3_Inverse-Cobra-Wave_1000fps_type-2-sticks.avi (7.97 Mo)
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| Origine | Fichiers produits par l'(les) auteur(s) |
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| Origine | Fichiers produits par l'(les) auteur(s) |
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