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Question 3 (10 points) On fait un test de traction sur un chantillon d'acier ayant une section circulaire (diamtre de 15 mm) et une

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Question 3 (10 points) On fait un test de traction sur un chantillon d'acier ayant une section circulaire (diamtre de 15 mm) et une longueur de rfrence (Lo) de 80 mm. Pour les donnes montres dans le Tableau 1: (a) tracez le diagramme contrainte-dformation (-), (b) trouvez le module d'lasticit (E), (c) estimez la contrainte de souplesse (oy) en utilisant la mthode offset. A-176,7mm Tableau 1 Force (KN) Elongation (mm) (MPa) 0 0 0 22.2 0.021 125,637 63.8 0.072 361,064 75.6 0.1224 427,844 81.8 0.198 462,932 87.2 0.2988 493,492 106.8 1.3272 604,414 104.6 3.6576 591,964 129 7.62 730,051 124.6 10.668 705,150 117.6 14.3256 665,535

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