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- Sigma = E.Epsilon
- Sigma = Contrainte (Mpa)
- E = Module de Young (MPa)
- Epsilon = L / L0 (mm)
- L = allongement (mm)
- L0 = longueur initiale (mm)
- ---
- Résistance pratique
- Rpe = Re / s
- Rpe = Resistance pratique
- Re = Ressitance elastique (Mpa)
- s = coef. de sécurité
- ---
- Calcul de contrainte :
- Sigma = N / S
- Sigma = Contrainte (Mpa)
- N = Effort Normal (N)
- S = Aire section (mm²)
- Condition de la resistance : Rpe > Sigma
- ---
- Resistance limite elastique :
- Re = Fe / S
- Re = Resistance
- Fe = Force de traction maximale (N)
- S = Surface (mm²)
- ---
- Resistance limite à la rupture :
- Rr = Fr / S
- Rr = Resistance
- Fr = Force maximale de limite à la rupture (N)
- S = Surface (mm²)
- ---
- BONUS :
- Ductile = Flexible.
- Fragile = Non flexible.
- A gauche : déformation elastique
- A droite : déformation plastique
- Ecart gauche : déformation residuelle
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