Modélisation et étude du plissement des tôles lors de leur transport en continu dans les usines sidérurgiques

Abstract : In processing lines, sheets of metal are in a continuous form, called strip, and are driving by upper and lower rolls in an alternate up and down motion. This work deals with the formation of wrinkles when a strip passes over a roll. Finite element analyses are carried out to modelize wrinkling. Occurrence of wrinkles follows a buckling phenomenon induced by a tensile load, applied in order to avoid strip wandering. Indeed, when the strip is stretched, small compressive stresses appear near the roll and cause the strip buckling. Due to friction, the strip displacement increases significantly stresses induced by the buckling. So, the yield stress may be reached. In some cases, buckles evolve to create a wrinkle by a plastic cumulative mechanism. The influence of friction on the wrinkles formation is investigated. The mechanism of wrinkling is not the same for low and high values of the friction coefficient. Numerical results concerning the influence of the friction coefficient have been validated by an experimental study. Next, simulations are performed to modelize the wrinkling of steel sheets in continuous annealing furnaces. In this case, the effect of plasticity is more important. The influence of the sheet flatness is also taken into account. In addition, an analytical study of the buckling of plates under global tension is proposed.
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Nicolas Georges Marcel Jacques. Modélisation et étude du plissement des tôles lors de leur transport en continu dans les usines sidérurgiques. Autre. Université Paul Verlaine - Metz, 2004. Français. ⟨NNT : 2004METZ038S⟩. ⟨tel-01750001⟩

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