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Fig. 1

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Strain and strain rate as functions of time during a creep test: Cases of load increase (left) and load decrease (right) are considered. A stress drop (right) may trigger reverse creep. (The sample height increases for a time, even if the stress applied to the sample is compressive.)

Déformation et taux de variation de la déformation en fonction du temps au cours d’un essai de fluage : dans le cas du chargement (gauche) et déchargement (droite). Le déchargement peut générer le fluage inverse (la hauteur de l’éprouvette augmente pendant un moment même si l’éprouvette est sous une charge compressive).

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