Dislocation microstructures in steel during deep drawing

Fernandes, J.V.; Schmitt, Jean-Hubert

doi:10.1080/01418618308244323

Cited by 74 publications

(42 citation statements)

References 22 publications

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“…For the case of monotonic shear deformation of DC06, the results of earlier investigations by [7,28,35] and for interstitial free steels can be confirmed. Two families of cell-block boundaries are predominant, either parallel or orthogonal to the shearing direction.…”

Section: Dc06supporting

confidence: 71%

Phenomenological modeling of anisotropy induced by evolution of the dislocation structure on the macroscopic and microscopic scale

et al. 2011

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This work focuses on the modeling of the evolution of anisotropy induced by the development of the dislocation microstructure. A model formulated at the engineering scale in the context of classical metal plasticity and a model formulated in the context of crystal plasticity are presented. Images obtained by transmission-electron microscopy (TEM) show the influence of the strain path on the evolution of anisotropy for the case of two common materials used in sheet metal forming, DC06 and AA6016-T4. Both models are capable of accounting for the transient behavior observed after changes in loading path for fcc and bcc metals. The evolution of the internal variables of the models is correlated with the evolution of the dislocation structure observed by TEM investigations.

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Section: Dc06supporting

confidence: 71%

Phenomenological modeling of anisotropy induced by evolution of the dislocation structure on the macroscopic and microscopic scale

et al. 2011

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“…It is possible to have an idea of the s value to reach a critical shear stress value in order to begin the plastic deformation, if the Schmid factor, m; is known. For bcc materials the slipping systems are not so well defined as for hc and fcc; however, is usually accepted [16] that slip can occur in all the planes containing the close packed direction /1 1 1S. Thus, if the stresses are applied normally to the film surface (as it would be expected in the hardness measurements), for [ (Fig.…”

Section: Wasian Systemmentioning

confidence: 99%

“…The higher is the resistance to plastic deformation the harder the material. The critical shear stress for a slip system can be obtained from [16] …”

Section: Wasian Systemmentioning

confidence: 99%

Nanocrystalline structure and hardness of thin films

Cavaleiro

Louro

2002

Vacuum

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WaSiaN films were deposited by reactive sputtering in a N 2 +Ar atmosphere from a W target incrusted with different number of Si pieces. The coatings present different crystallographic structures from the crystalline a-W and W 2 N to amorphous phase. Crystalline films have very low grain sizes from 15 down to 3 nm.For WaSi films there is a good correlation between the increase of the hardness and both the increase of lattice parameter and decrease of grain size. However, for N containing films these tendencies are not systematically observed. The homogeneity in the lattice distortion seems to be more adequate to interpret the hardness variation.Generally, crystalline films have higher hardness (35-41 GPa) than amorphous coatings (21-31 GPa). r

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“…According to Fernandes and Schmitt (1983) the through-thickness strain after the same amount of equivalent strain under equibiaxial stretching is lower than after uniaxial tension. Hence, a throughthickness neck followed by plastic localization appears earlier under equibiaxial stretching prestrains than under uniaxial tension prestrains.…”

Section: A C C E P T E D Accepted Manuscriptmentioning

confidence: 99%

Analysis of sheet metal formability through isotropic and kinematic hardening models

Butuc

Teodosiu

Barlat

et al. 2011

European Journal of Mechanics - A/Solids

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of sheet metal formability through isotropic and kinematic hardening models. European Journal of Mechanics -A/Solids, Elsevier, 2011, 30 (4) This is a PDF file of an unedited manuscript that has been accepted for publication. As a service to our customers we are providing this early version of the manuscript. The manuscript will undergo copyediting, typesetting, and review of the resulting proof before it is published in its final form. Please note that during the production process errors may be discovered which could affect the content, and all legal disclaimers that apply to the journal pertain. M A N U S C R I P T A C C E P T E D ACCEPTED MANUSCRIPT AbstractThe present paper aims at analysing the sheet metal formability through several isotropic and kinematic hardening models. Specifically, a special attention is paid to the physically-based hardening model of Teodosiu and Hu (1995), which accounts for the anisotropic work-hardening induced by the microstructural evolution at large strains, as well as to some more conventional hardening models, including the isotropic Swift strain-hardening power law, and the Voce saturation strain-hardening law, combined with a non-linear kinematic hardening described by the Armstrong-Frederick law. The onset of localized necking is simulated by an advanced sheet metal forming limit model which connects, through the Marciniak-Kuczinsky analysis, the hardening models with the anisotropic yield criterion Yld2000-2d (Barlat et al., 2003). Both linear and complex strain paths are taken into account. The selected material is a DC06 steel sheet. The validity of each model is assessed by comparing the predicted forming limits with experimental results carefully obtained on this steel. The origin of discrepancy in the predicted results using different hardening models is thoroughly analyzed.

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Dislocation microstructures in steel during deep drawing

Cited by 74 publications

References 22 publications

Phenomenological modeling of anisotropy induced by evolution of the dislocation structure on the macroscopic and microscopic scale

Phenomenological modeling of anisotropy induced by evolution of the dislocation structure on the macroscopic and microscopic scale

Nanocrystalline structure and hardness of thin films

Analysis of sheet metal formability through isotropic and kinematic hardening models

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