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Plasticité dynamique des tôles : instabilité thermomécanique et nouvelle technique du poinçonnement par impact

Abstract : This work is focussed on two important problems for the industry. The first one is the strain localization and thermo-mechanical coupling. The second one concerns perforation of the thin mettalic sheets, by a direct impact. The effect of adiabatic heating on the FLD (Forming limit diagram) has been analysed for mild steels. The modelling is based on the Marciniak-Kuczynski approach, where the deformation theory with the isotropic hardening was used. It was shown that the most intense increase of temperature and deformation occurs inside the instability band than in the zone of the uniform deformation. A new experimental technique of dynamic bulging by direct impact of a hemispherical projectile has been developped using an air launcher and a Hopkinson tube. The aim was to find response of a sheet made of mild steel to different impact velocities (up to 100m/s). Another goal was to study the rate sensitivity of bulging at different impact velocities. Experments performed within a wider range of velocities, from quasi-static to impact, have shown that the increase of the punch velocity (projectile) cause an increase of the critical force of frcture and perforation energy. Those effects are non-linear with respect to high velocities, but at the range of the lower velocities those quantities are proportional to the logarithm of the punch velocity
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Hassan Boumaaïz. Plasticité dynamique des tôles : instabilité thermomécanique et nouvelle technique du poinçonnement par impact. Autre. Université Paul Verlaine - Metz, 1994. Français. ⟨NNT : 1994METZ061S⟩. ⟨tel-01776857⟩

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