Orientation dependence of the plastic slip near notches in ductile FCC single crystals

W. C. Crone, T. W. Shield, A. Creuziger, B. Henneman

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32 Scopus citations

Abstract

Results from experiments conducted on copper FCC single crystals are reported. Two symmetric crystallographic orientations and four nonsymmetric crystallographic orientations were tested. The slip line fields that form near a pre-existing notch in these specimens were observed. The changes in these patterns as the orientation of the notch in the crystal is rotated in an {101} plane are discussed. Sectors of similar slip line patterns are identified and the type of boundaries between these sectors are discussed. A type of sector boundary called mixed kink is identified. Specimen orientations that differ by 90° are found to have different slip line patterns, contrary to the predictions of perfectly plastic slip line theory. The locations of the first slip lines to form are compared to the predictions obtained using anisotropic linear elastic stress field solutions and the initial plane-strain yield surfaces. It is found that comparison of these surface slip line fields to plane strain crack tip solutions in the annular region between 350 and 750 μm is justified. The differences in anisotropic elastic solutions for orientations that are 90° apart explain the lack of agreement with perfectly plastic slip line theory.

Original languageEnglish (US)
Pages (from-to)85-112
Number of pages28
JournalJournal of the Mechanics and Physics of Solids
Volume52
Issue number1
DOIs
StatePublished - Jan 2004

Bibliographical note

Funding Information:
TWS would like to thank the National Science Foundation under grants MSS-9257945-2 and CMS-9800245 for supporting this research. WCC would also like to thank the University of Wisconsin Graduate School, as well as the American Association of University Women and Zonta International for fellowship support during part of this research. We thank J. W. Kysar and W. J. Drugan for many helpful discussions.

Keywords

  • Fracture mechanics
  • Single crystal

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