Strukturänderungen von vielkristallinem Kupfer nach extrem hoher plastischer Verformung

Grewe, Holger; Kappler, E.

doi:10.1002/pssb.19640060310

Cited by 11 publications

(3 citation statements)

References 3 publications

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“…The footprint of the beam on the sample was 300 Â 300 mm 2 . Since the deformation is decreasing from the surface to the center of the specimen the different measurements along the main axis correspond to linearly decreasing strain values, as to be calculated according to Grewe and Kappler [25].…”

Section: X-ray Diffraction Techniquementioning

confidence: 99%

Microstructural Parameters in Large Strain Deformed Ni Polycrystals as Investigated by Synchrotron Radiation

Schafler

Zehetbauer

Kopacz

et al. 1999

phys. stat. sol. (a)

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Section: X-ray Diffraction Techniquementioning

confidence: 99%

Microstructural Parameters in Large Strain Deformed Ni Polycrystals as Investigated by Synchrotron Radiation

Schafler

Zehetbauer

Kopacz

et al. 1999

phys. stat. sol. (a)

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“…(This assumption was investigated and proved experimentally by Grewe and Kappler [6].) (2) The shear stress (~) is determined only by the shear strain:~=~(k).…”

Section: Introductionmentioning

confidence: 99%

Nonlocal effects in torsional deformation

Székely

Groma

Lendvai

2000

Materials Science and Engineering: A

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The stress distribution in torsionally deformed cylindrical polycrystalline copper samples was investigated. The strain in torsional deformation changes with distance from the torsional axis and thus the local extent of work hardening and consequently the local flow stress changes as well. The variation of the flow stress with radial position in the samples was measured by microhardness tests. It was found that except for the near-axis region the local flow stress can be correctly calculated by the Nadai evaluation from the experimentally measured torque versus torsional angle function. Hardening is observed in the axis of the torsionally deformed samples in spite of the fact that the shear strain is zero here. The hardening obtained in the axis depends approximately linearly on the torsional angle, and it increases with grain size. This effect is interpreted by introducing nonlocal effects in the continuum description.

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“…For torsion, bulk dumbbell-shaped samples with diameter φ = 9 mm and gauge length l = 50 mm were used. The formulae given by Grewe and Kappler [10] were applied to derive the torsional stress and strain values given in figure 1 (for details see [11]). Compression tests have been performed in a conventional tensile machine by means of a compression cage, allowing for deformation of cylindrical samples at an initial height/diameter ratio h/2r = 1.6-2.0.…”

Section: Methodsmentioning

confidence: 99%

Large-strain hardening curves corrected for texture development

Kopacz

Tóth

Zehetbauer

et al. 1999

Modelling Simul. Mater. Sci. Eng.

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The paper is concerned with the problem of constructing equivalent stress-equivalent strain curves at large strains. For the equivalent strain, the average accumulated crystallographic shear is used, while for the equivalent stress, the resolved shear stress is employed. The latter is obtained from the work conjugacy condition. In such a construction of the hardening curve, the Taylor factor appears to be the major factor that can be calculated from polycrystal deformation texture models. In this paper, the viscoplastic Taylor and self-consistent approaches are employed to calculate the Taylor factors. The self-consistent model was calibrated on the torsion texture development which is the most sensitive to the polycrystal model parameters at large strains. The obtained Taylor factors show important variations in torsion, compression and rolling. They have been used to convert experimentally measured work hardening data on copper into resolved shear stress-resolved shear strain curves. The effect of the Taylor factor on the absolute hardening rate was found to be significant at a large strain range of deformation. The simulation textures were markedly different from the measured textures at very large strains where both polycrystal texture deformation models fail to predict the correct texture evolution. For this reason, the textures were measured at increasing strains at 11 points in rolling, at 12 points in compression and at four points in torsion from where the Taylor factors were calculated by both of the models in order to construct the equivalent stress-equivalent strain curves.

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Strukturänderungen von vielkristallinem Kupfer nach extrem hoher plastischer Verformung

Cited by 11 publications

References 3 publications

Microstructural Parameters in Large Strain Deformed Ni Polycrystals as Investigated by Synchrotron Radiation

Microstructural Parameters in Large Strain Deformed Ni Polycrystals as Investigated by Synchrotron Radiation

Nonlocal effects in torsional deformation

Large-strain hardening curves corrected for texture development

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