, seuil : Couple maximum : Couples seuil et maximum en fonction de la fraction volumique

, seuil : Couple maximum : Couples seuil et maximum en fonction de la fraction volumique

, Couple seuil et couple maximum en fonction de ?, cas non répulsif

, verts des figures 14 et 15 présentent l'évolution du rapport entre le couple mesuré et la pression imposée : ? Pimp d'une part, et la fraction volumique critique ? c d'autre part, en fonction de la pression imposée au système. Le rapport ? Pimp peut s'interpréter comme un analogue du coefficient de frottement macroscopique du milie? µ = ? Pimp

, On sait qu'il est difficile de s'approcher du blocage d'un milieu granulaire lorsqu'on impose le volume. De plus, dans notre système, nous sommes dominés par les effets de bords. Nous nous sommes donc tournés vers des expériencesà pression imposée. Dans ce cas, les résultats sont beaucoup plus satisfaisants. En effet, nous observons bien une transition du coefficient de frottement macroscopique? autour d'une valeur critique P c de la pression. Il convient toutefois de nuancer ce succès par plusieurs observations. Tout d'abord, P c ne semble pas correspondreà la pression magnétique exercée dans le milieu, qui est pourtant notreéchelle de pression a priori. De plus, si le comportement de? est bien celui attendu, celui de ? nous montre que la transition que nous voulions observer est masquée par les forces longue portée, Couple/Pimp, 9 degrés par seconde, 10 Hz, avec aimants Couple/Pimp, 9 degrés par seconde, 25 Hz, avec aimants Couple/Pimp, 19 degrés par seconde, 10 Hz, avec aimants Couple/Pimp, 9 degrés par seconde, 25 Hz, sans aimants Couple/Pimp

, L'expérience modèle sera améliorée en tenant compte des difficultés rencontrées. Nous nous tourneronségalement vers les suspensions rhéo-épaississantes réelles, Cependant, les résultats obtenus dans les expériencesà pression imposée nous encouragentà poursuivre dans cette voie

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