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Cours-Proprietes-mecaniques-des-materiaux

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1.3.2- COURBE CONTRAINTE-DEFORMATION<br />

R m<br />

R e<br />

σ<br />

E<br />

<br />

<br />

<br />

Ex : matériau ductile (Figure 11)<br />

Contrainte nominale : σ n = F / S 0<br />

domaine élastique (déformation réversible)<br />

domaine plastique (déformation irréversible)<br />

ε n<br />

Déformation nominale :<br />

ε n = Δ L / L 0<br />

striction puis rupture (déformation irrémédiable)

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