3 Sur 5
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3- CONTRAINTE TANGENTIELLE 3-1- Contrainte tangentielle S1
S2
Fig.3
=GM
M
M1 M
Be tci tech nol ogi es
x
M'
X'
(S1)
................................................................. ................................................................. ................................................................. ................................................................. ................................................................. ................................................................. ................................................................. ................................................................. ................................................................. ................................................................. ................................................................. ................................................................. ................................................................. ................................................................. .................................................................
G
G1
X
s
X
Or :Loi de Hooke : d'ou
M
M
= G.
M
M:
en N.mm-² .........: en N.mm-² .........:en rad.mm-¹ .........: en mm
=
Répartition des contraintes dans une section droite
D=
Fig.4
Pour
MAXI
MAXI
maxi =
R ( rayon de la section droite)
=GM
M
G
Remarque: coupure (S) section droite
MAXI=
D D
PROF:KOUAME K.M.
LA TORSION R.D.M
DOC: 3/5
S2
Fig.3
=GM
M
M1 M
Be tci tech nol ogi es
x
M'
X'
(S1)
................................................................. ................................................................. ................................................................. ................................................................. ................................................................. ................................................................. ................................................................. ................................................................. ................................................................. ................................................................. ................................................................. ................................................................. ................................................................. ................................................................. .................................................................
G
G1
X
s
X
Or :Loi de Hooke : d'ou
M
M
= G.
M
M:
en N.mm-² .........: en N.mm-² .........:en rad.mm-¹ .........: en mm
=
Répartition des contraintes dans une section droite
D=
Fig.4
Pour
MAXI
MAXI
maxi =
R ( rayon de la section droite)
=GM
M
G
Remarque: coupure (S) section droite
MAXI=
D D
PROF:KOUAME K.M.
LA TORSION R.D.M
DOC: 3/5
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