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Civil-Comp Proceedings
ISSN 1759-3433 CCP: 79
PROCEEDINGS OF THE SEVENTH INTERNATIONAL CONFERENCE ON COMPUTATIONAL STRUCTURES TECHNOLOGY Edited by: B.H.V. Topping and C.A. Mota Soares
Paper 63
A Micromechanical Model for Inelastic Ductile Damage Prediction in Polycrystalline Metals M. Boudifa+, K. Saanouni+ and J.-L. Chaboche+*
+UTT/LASMIS, University of Technology of Troyes, France
Full Bibliographic Reference for this paper
M. Boudifa, K. Saanouni, J.-L. Chaboche, "A Micromechanical Model for Inelastic Ductile Damage Prediction in Polycrystalline Metals", in B.H.V. Topping, C.A. Mota Soares, (Editors), "Proceedings of the Seventh International Conference on Computational Structures Technology", Civil-Comp Press, Stirlingshire, UK, Paper 63, 2004. doi:10.4203/ccp.79.63
Keywords: micro-macro modeling, self-consistent scheme, polycristalline plasticity, ductile crystallographic damage, finite element analysis.
Summary
The ductile damage often observed during the sheet or bulk metal forming has
undoubtedly a micro-structural origin. For the modeling purpose it will be very interesting to
take into account some micro-structural aspects of the ductile damage. Starting from a
micromechanical model for elastoplastic polycristalline FCC metals developed for low cycle
fatigue [1,2], a new model is proposed in order to describe the ductile crystallographic damage.
First the theoretical background of the polycristalline plasticity including the mixed
crystallographic nonlinear hardening fully coupled with damage is presented in the framework of
the self-consistent micro-macro approach. This highly heterogeneous micro-damage is supposed
to evolve on the activated slip systems and leads to an isotropic (homogeneous) macro damage at
the representative volume element (RVE).
This model has been implemented into a general purpose finite element code Zebulon. Each
Gauss point is then defined as an aggregate of Application is made to the numerical simulation of some mechanical tests under various loading paths. The results at the macroscopic scale are compared with the classical polycrystalline plasticity without damage and to the available experimental results. Besides, many numerical results are shown at the lower scales for a some selected grains and crystallographic slip systems, in order to show the evolution of the heterogeneous fields as the stress, strain and the crystallographic damage. The influence of many parameters are studied:
References
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