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Vers la caractérisation du collage des alliages d'aluminium en mise en forme à froid

Abstract : Aluminum alloys are materials that have a strong tendency to galling when they are cold formed. Caused by a breakdown of the lubricant film between the part and the tool, galling can have dramatic consequences on the forming operation: scratches and cracks in the surface of the piece, clogging and deterioration of tools, etc. The present work studies the galling mechanisms of the aluminum alloy 6082 during its cold forming. Trials involving the Upsetting-Sliding Test (UST) are performed first. The UST is a test bench able to simulate in laboratory conditions the contact encountered at the part/tool interface of industrial processes. Trials are achieved under varying contact pressure and lubrication. UST results show that galling is strongly influenced by tool roughness and is not accompanied by a significant increase of friction. A set of finite element computations of the UST is then run to predict galling occurrence. Lubricant and adhesion forces are not modelled in this simplified approach: only the mechanical aspects are taken into account, the chemical ones are implicitly taken into account by coefficients of friction. Four common damage and fracture models are used. Results show that whatever the damage and fracture models used, tool roughness has to be modelled in order to predict the galling onset.
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https://hal-uphf.archives-ouvertes.fr/hal-03437254
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Submitted on : Friday, November 19, 2021 - 5:49:19 PM
Last modification on : Saturday, November 20, 2021 - 3:50:10 AM

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  • HAL Id : hal-03437254, version 1

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André Dubois, Oussama Filali, Mirentxu Dubar, Cédric Hubert, Tat-Thang Pham. Vers la caractérisation du collage des alliages d'aluminium en mise en forme à froid. 23ème Congrès Français de Mécanique, Aug 2017, Lille, France. ⟨hal-03437254⟩

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