A Dislocation based Constitutive Model for Warm Forming of Aluminum Sheet


Kurukuri, S. and Ghosh, M. and Boogaard, A.H. van den (2008) A Dislocation based Constitutive Model for Warm Forming of Aluminum Sheet. In: The 9th International Conference on Technology of Plasticity, ICTP, 7-11 September 2008, Gyeongju, Korea (pp. pp. 333-338).

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Abstract:The formability of aluminum sheet can be improved considerably by increasing the temperature.
At elevated temperatures, the mechanical response of the material becomes strain rate dependent.
To accurately simulate warm forming of aluminum sheet, a material model is required that
incorporates the temperature and strain rate dependency. In this paper, the dislocation based
Alflow hardening model is used. The model incorporates the influence of the temperature and
strain rate effect on the flow stress by means of the storage and dynamic recovery of dislocations.
It also includes the effects of solute level, particle fraction and grain size. Cylindrical cup deep
drawing simulations are presented using shell elements. The anisotropic behavior of the sheet is
described by using the Vegter yield locus. Experimental drawing test data is used to validate the
modeling approach, where the model parameters follow from tensile tests.
Item Type:Conference or Workshop Item
Engineering Technology (CTW)
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