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Rotation field in wedge indentation of metals

Published online by Cambridge University Press:  23 September 2011

Narayan Sundaram ,
Yang Guo ,
Tejas G. Murthy ,
Chris Saldana  and
Srinivasan Chandrasekar
Narayan Sundaram
Affiliation:
Center for Materials Processing and Tribology, Purdue University, West Lafayette, Indiana 47907
Yang Guo
Affiliation:
Center for Materials Processing and Tribology, Purdue University, West Lafayette, Indiana 47907
Tejas G. Murthy
Affiliation:
Department of Civil Engineering, Indian Institute of Science, Bangalore 560 054, India
Chris Saldana
Affiliation:
Department of Industrial and Manufacturing Engineering, The Pennsylvania State University, University Park, Pennsylvania 16802
Srinivasan Chandrasekar*
Affiliation:
Center for Materials Processing and Tribology, Purdue University, West Lafayette, Indiana 47907
*
a)Address all correspondence to this author. e-mail: chandy@purdue.edu
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Abstract

A study is made of the rotation field in wedge indentation of metals using copper as the model material system. Wedges with apical angles of 60° and 120° are used to indent annealed copper, and the deformation is mapped using image correlation. The indentation of annealed and strain-hardened copper is simulated using finite element analysis. The rotation field, derived from the deformation measurements, provides a clear way of distinguishing between cutting and compressive modes of deformation. Largely unidirectional rotation on one side of the symmetry line with small spatial rotation gradients is characteristic of compression. Bidirectional rotation with neighboring regions of opposing rotations and locally high rotation gradients characterizes cutting. In addition, the rotation demarcates such characteristic regions as the pile-up zone in indentation of a strain-hardened metal. The residual rotation field obtained after unloading is essentially the same as that at full load, indicating that it is a scalar proxy for plastic deformation as a whole.

Keywords

NanoindentationHardnessSimulation
Type
Articles
Information
Journal of Materials Research , Volume 27 , Issue 1: Focus Issue: Instrumented Indentation , 14 January 2012 , pp. 284 - 293
Copyright
Copyright © Materials Research Society 2011

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