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, éprouvette est au repos, la force de traction F = 0 et l'allongement vaut 0

, on tire sur l'éprouvette avec une force F 1 qui entraine un allongement e 1 de l'éprouvette

, éprouvette avec une force plus importante F 2 , cela entraine un allongement e 3 de l'éprouvette

, supprime la force F 2 , mais l'éprouvette ne retrouve pas son état initial. Nous sommes dans la zone plastique du matériau

, exerce un effort de traction supplémentaire plus important que l'effort F 2 . Après avoir atteint un maximum, la force décroit et l'éprouvette s'amincit en un endroit appelé zone de striction