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Rotation field in wedge indentation of metals

Sundaram, Narayan and Guo, Yang and Murthy, Tejas G and Saldana, Chris and Chandrasekar, Srinivasan (2012) Rotation field in wedge indentation of metals. In: Journal of Materials Research, 27 (1). pp. 284-293.

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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.

Item Type: Journal Article
Additional Information: Copyright of this article belongs to Cambridge University Press.
Department/Centre: Division of Mechanical Sciences > Civil Engineering
Date Deposited: 24 Feb 2012 11:55
Last Modified: 27 Feb 2012 05:13
URI: http://eprints.iisc.ernet.in/id/eprint/43683

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