An experimental study of the plastic strain fields near a notch tip in a copper single crystal during loading

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Abstract

The strain fields near a 100 μm notch in a single crystal of copper have been measured. The notch lies in a {110} plane and prospective crack growth is in a 〈100〉 direction. The surface strains were measured during loading using a microscopic moire method. Data from six load levels are presented for an approx. 2 by 2.5 mm region on one side of the notch tip. These data show that the patchy strain field observed in an iron-silicon single crystal with an identical orientation also occurred in this copper single crystal. Four (8 symmetric) strain sectors form, however, the strain field does not develop in a proportional manner. Initially slip occurs in the second sector and this is visible as discrete slip bands. This deformation leads to the formation of a fan type strain field in the third sector as the overall strain level increases.

Original languageEnglish (US)
Pages (from-to)1547-1561
Number of pages15
JournalActa Materialia
Volume44
Issue number4
DOIs
StatePublished - Apr 1996

Bibliographical note

Funding Information:
Acknowledgements-The author would like to thank Professor W. J. Drugan for many helpful comments and suggestions. The author would like to acknowledge the support of the National Science Foundation, grant

Funding Information:
No. MSS-9257945-2, the Office of Naval Research, grant No. N/N00014-91-J-4034 and the McKnight Foundation for supporting this work. The author would also like to thank Dr C. Chu for growing the single crystal.

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