Mechanical behavior of Mg subjected to strain path changes: Experiments and modeling

Wen, Wei; Borodachenkova, Marina; Tomé, Carlos N.; Vincze, Gabriela; Rauch, E.F.; Barlat, Frédéric; Grácio, J.J.

doi:10.1016/j.ijplas.2014.10.009

Cited by 100 publications

(35 citation statements)

References 52 publications

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“…(8)) are required as inputs in addition to the initial crystallographic texture. Nevertheless, since the current form of VPSC model did not satisfactorily explain the discrepancy with the experimental observations, a follow-up study based on an advanced model (such as [41,42]) might be required.…”

Section: Discussionmentioning

confidence: 95%

Multiaxial constitutive behavior of an interstitial-free steel: Measurements through X-ray and digital image correlation

et al. 2016

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Constitutive behaviors of an interstitial-free steel sample were measured using an augmented Marciniak experiment. In these tests, multiaxial strain field data of the flat specimens were measured by the digital image correlation technique. In addition, the flow stress was measured using an X-ray diffractometer. The flat specimens in three different geometries were tested in order to achieve 1) balanced biaxial strain, and plane strain tests with zero strain in either 2) rolling direction or 3) transverse direction. The multiaxial stress and strain data were processed to obtain plastic work contours with reference to a uniaxial tension test along the rolling direction. The experimental results show that the mechanical behavior of the subjected specimen deviates significantly from isotropic behavior predicted by the von Mises yield criterion. The initial yield loci measured by a Marciniak tester is in good agreement with what is predicted by Hill's yield criterion. However, as deformation increases beyond the vonMises strain of 0.05, the shape of the work contour significantly deviates from that of Hill's yield locus. A prediction made by a viscoplastic self-consistent model is in better agreement with the experimental observation than the Hill yield locus with the isotropic work-hardening rule. However, none of the studied models matched the initial or evolving anisotropic behaviors of the interstitial-free steel measured by the augmented Marciniak experiment.

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Section: Discussionmentioning

confidence: 95%

Multiaxial constitutive behavior of an interstitial-free steel: Measurements through X-ray and digital image correlation

et al. 2016

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“…The reversibility parameter controls the fraction of total dislocation density that evolves as the reversible dislocation density. In Equations and ,

m

is a parameter accounting for rate of dislocation recombination having value of 0.5 and

ρ_{0}^{s}

is the total dislocation density at the moment of shear reversal on the s th slip system …”

Section: Dislocation Density‐based Hardening Of Slip and Twin Systemsmentioning

confidence: 99%

Multiscale Modeling of Microstructure‐Property Relationships of Polycrystalline Metals during Thermo‐Mechanical Deformation

Knežević

Beyerlein

2018

Adv Eng Mater

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The plastic deformation of polycrystalline metals is primarily carried by the crystallographic glide of dislocations and growth of deformation twins. According to the thermodynamic theory of slip, dislocation motion is thermally activated, while deformation twinning is an athermal process. Dislocations must overcome barriers in order to move, while twins must relax the stored energy while growing. These concepts define the critical activation stresses on a slip or twin crystallographic system and how they evolve with plastic strain. This article reviews recent advances in the development of a model for the critical activation stresses for thermally activated glide and the expansion of deformation twins, its implementation into polycrystal plasticity models, and several applications for predicting the constitutive response of polycrystalline metals. Calculations are performed for a range of polycrystalline metals differing in microstructural complexity and crystal structure. These examples include face-centered cubic AA6022-T4, IN718, Haynes 25, and pure Cu, body-centered cubic Nb, Ta, Ta-10W, and steel DP590, hexagonal close-packed pure Be, pure Zr, pure Ti, AZ31, Mg4Li, and orthorhombic U. Excellent agreement with experimental measurement are demonstrated in terms of texture, stress-strain response, and geometrical changes in the samples during deformation for all these metals.

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“…Compared to the model of Beyerlein and Tomé, the function

g^{s}

is proposed based on the recent understanding of the reversal‐related dislocation accumulation/annihilation process . It is also simpler with less parameter involved but able to capture the hardening evolution during the work hardening stagnation stage for materials with different properties.…”

Section: Modelingmentioning

confidence: 99%

Modeling of the Mechanical Response During Reversal Shear Loading: Application to Steels

Wen

Borodachenkova

Barlat

et al. 2015

steel research int.

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A hardening model that considers the dislocation reversal‐related mechanisms is applied to predict the mechanical behavior of low carbon (LC) and twinning‐induced plasticity (TWIP) steels under forward–reverse shear test with various pre‐strain levels. The predicted results are presented in terms of stress–strain response and texture evolution. It is shown that the proposed model, embedded in the visco‐plastic self‐consistent (VPSC) framework, well captures the changes in the reloading yield stress and the hardening evolution due to the strain path reversal. The contributions of the different mechanisms are also discussed.

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Mechanical behavior of Mg subjected to strain path changes: Experiments and modeling

Cited by 100 publications

References 52 publications

Multiaxial constitutive behavior of an interstitial-free steel: Measurements through X-ray and digital image correlation

Multiaxial constitutive behavior of an interstitial-free steel: Measurements through X-ray and digital image correlation

Multiscale Modeling of Microstructure‐Property Relationships of Polycrystalline Metals during Thermo‐Mechanical Deformation

Modeling of the Mechanical Response During Reversal Shear Loading: Application to Steels

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