Journal
INTERNATIONAL JOURNAL OF MATERIAL FORMING
Volume 14, Issue 3, Pages 449-465Publisher
SPRINGER FRANCE
DOI: 10.1007/s12289-020-01587-4
Keywords
Aluminum alloy sheet; Temperature; and rate-dependent flow stress; Non-quadratic anisotropic yield function; Finite element simulation; Fully implicit Euler scheme
Categories
Funding
- Science and Technology Research Project of Jiangxi Provincial Department of Education [GJJ170631]
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Al-Mg alloys exhibit anisotropy, temperature softening, and strain rate hardening in warm forming conditions. Previous research has not combined viscoplastic models with advanced yield functions for warm forming simulation, especially using an implicit finite element program. In this study, a viscoplastic model was successfully implemented with advanced yield functions for warm forming simulation of AA5182-O alloy, showing good agreement between simulation and experimental results.
Al-Mg alloys have the properties of anisotropy, temperature softening and strain rate hardening in warm forming conditions. The former could be modeled by an advanced non-quadratic yield function. The rate-dependent characteristic could be modeled by viscoplastic constitutive models. Up to now, few investigations have combined a viscoplastic model with advanced yield functions for warm forming simulation, especially by an implicit finite element (FE) program. In this investigation, the warm forming simulation of AA5182-O alloy was presented via Abaqus/Standard, considering the viscoplasticity and anisotropy. The established viscoplastic model could well reflect the nearly rate-independent initial yield stress of the selected material, and its parameters could be easily calibrated. The numerical implementation of the viscoplastic model associated with Yld2000 and Yld2004 yield functions was carried out using an implicit integration algorithm, and the algorithmic tangent was deduced. Results accordance between the simulation and experiment, including warm uniaxial tension test and warm deep drawing test of AA5182-O, showed the rationality of the established material model and the corresponding implicit implementation scheme.
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