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SI Fottemt Adhérence

SI Adhérence

Définition d'adhérence Les deux surfaces en contact tendent à glisser l'une par rapport à l'autre (sans déplacement)
Définition de frottement Les deux sufaces en contact glissent l'une par rapport à l'autre (avec déplacement)
Avantages Transmettre, freiner ou garder en équilibre (embrayage ou frein)
Inconvénients Usure, baisse du rendement, réchauffement
Où les frottements interviennents dans un mécanisme ? Dans les liaisons
Le facteur d'adhérence f est égal T(2/1):N(2/1) = tan phi Avec T composante tangeantielle (horizontal) et N composante normal (vertical)
Lois de COULOMBS Loi n°1: Pour qu'il y ait équilibre, il est nécessaire que la force soit contenue dans le cône d'adhérence Loi n°2; Cette action s'oppose au mouvement, elle est donc contenue dans une seule des deux parties du cône d'adhérence
Created by: MaxenceN
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