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HerreraSolaz
V.

Llorca Martinez
Francisco Javier

Dogan
E.

Karaman
I.

Segurado Escudero
Javier
An inverse optimization strategy to determine single crystal mechanical behavior from polycrystal tests: Application to AZ31 Mg alloy
Elsevier
byncnd
pub
 materiales
public
Crystal plasticity; Polycrystal homogenization; Inverse analysis; Levenbergâ€“Marquardt; AZ31 Mg alloy
An inverse optimization strategy was developed to determine the single crystal properties from experimental results of the mechanical behavior of polycrystals. The polycrystal behavior was obtained by means of the finite element simulation of a representative volume element of the microstructure in which the dominant slip and twinning systems were included in the constitutive equation of each grain. The inverse problem was solved by means of the LevenbergMarquardt method, which provided an excellent fit to the experimental results. The iterative optimization process followed a hierarchical scheme in which simple representative volume elements were initially used, followed by more realistic ones to reach the final optimum solution, leading to important reductions in computer time. The new strategy was applied to identify the initial and saturation critical resolved shear stresses and the hardening modulus of the active slip systems and extension twinning in a textured AZ31 Mg alloy. The results were in general agreement with the data in the literature but also showed some differences. They were partially explained because of the higher accuracy of the new optimization strategy but it was also shown that the number of independent experimental stressstrain curves used as input is critical to reach an accurate solution to the inverse optimization problem. It was concluded that at least three independent stressstrain curves are necessary to determine the single crystal behavior from polycrystal tests in the case of highly textured Mg alloys.
published
201406
International Journal of Plasticity
57
115
10.1016/j.ijplas.2014.02.001
Caminos
Ciencia_Materiales
TRUE
07496419
http://www.sciencedirect.com/science/article/pii/S0749641914000333

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