Nonlocal effects in torsional deformation

F. Székely, I. Groma, J. Lendvai

Research output: Contribution to journalArticle

12 Citations (Scopus)

Abstract

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.

Original languageEnglish
Pages (from-to)148-153
Number of pages6
JournalMaterials Science and Engineering A
Volume277
Issue number1-2
Publication statusPublished - Jan 31 2000

Fingerprint

Plastic flow
Hardening
hardening
Shear strain
Strain hardening
Microhardness
work hardening
Stress concentration
Copper
shear strain
Torque
microhardness
stress distribution
torque
grain size
continuums
copper
evaluation

Keywords

  • Constitutive equations
  • Nonlocal effects
  • Torsional deformation

ASJC Scopus subject areas

  • Materials Science(all)

Cite this

Nonlocal effects in torsional deformation. / Székely, F.; Groma, I.; Lendvai, J.

In: Materials Science and Engineering A, Vol. 277, No. 1-2, 31.01.2000, p. 148-153.

Research output: Contribution to journalArticle

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