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Courbe traction polymeres.svg en Tensile testing curves for polymers brittle II viscoelastic with flowing threshold ee III viscolastique sans seuil d'coulement IV viscoplastique own from Trotignon Piperaud Verdu Dobraczynski Prcis de matires plastiques ed Nathan Paris Cdang courbe traction visco svg inkscape Cczero Stressstrain