Modelling of aluminium sheet forming at elevated temperatures


Boogaard, A.H. van den and Huetink, J. (2004) Modelling of aluminium sheet forming at elevated temperatures. In: NUMIFORM, International Conference on Numerical Methods in Industrial Forming Processes, 13-17 June, 2004, Columbus, Ohio.

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Abstract:The formability of Al–Mg sheet can be improved considerably, by increasing the temperature. By heating the
sheet in areas with large shear strains, but cooling it on places where the risk of necking is high, the limiting drawing ratio
can be increased to values above 2.5. At elevated temperatures, the mechanical response of the material becomes strain rate
dependent. To accurately simulate warm forming of aluminium sheet, a material model is required that incorporates the
temperature and strain-rate dependency. In this paper simulations are presented of the deep drawing of a cylindrical cup,
using shell elements. It is demonstrated that the familiar quadratic Hill yield function is not capable of describing the plastic
deformation of aluminium. Hardening can be described successfully with a physically based material model for temperatures
up to 200 �C. At higher temperatures and very low strain rates, the flow curve deviates significantly from the model
Item Type:Conference or Workshop Item
Copyright:American Institute of Physics
Engineering Technology (CTW)
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