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FLEXION+EXTENSION : Crochet de levage
Domaine Professionnel Sous domaine Professionnel
Section Technique Option Mécanique Auto
Discipline Résistance des matériaux (RDM) Classe 6ème
Matériel didactique un crochet (voire palan) Auteur SCHOOLAP.COM
Objectif opérationnel A la fin de la leçon, l'élève sera capable de déterminer les sections dans un crochet.
Réference R. Basquin 288 – 289
Activité initiale

RAPPEL

Donner l’expression de la contrainte à : l’extension et la flexion

 

RAPPEL

τt=N/S                     

MOTIVATION

Sur quelle partie du crochet fixe-t-on la charge à soulever à l'aide d'un palan ? 

MOTIVATION 

La charge à soulever se fixe au crochet.

Annonce du sujet

Qu'allons-nous étudier aujourd'hui ?

Annonce du sujet

Aujourd'hui, nous allons étudier l'application de la flexion sur le crochet de levage.

Activité principale

Analyse 

Les crochets sont faits généralement en acier doux, extra-doux enfin de rendre moins fragiles.

Vérification des sections

1°) section S1 et S2 : la charge P qui sollicite le crochet est supposée localisée au point A, suivant l’axe XX’ de la tige file²tée B.

La section S1 est sollicitée au cisaillement et la section S2 à la traction.

Cette dernière doit être calculée en fonction du diamètre du noyau de la partie filetée.

2°) section S3 : soit G son centre de gravité. La réduction  en ce point de la force P donne une force P’ équipollente à P et un couple de moment     μf=L*P 

Bien que l’axe du crochet soit curviligne, nous pouvons admettre que les formules de flexion établie pour une poutre d’axe rectilignes sont encore valables.

Synthèse

Donnez  la signification des différentes sections du crochet

 

S1= cisaillement,  S2= traction ;     S3= Flexion

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