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Observations of transient high temperature vortical microstructures in solids during adiabatic shear banding

Guduru, P. R. and Ravichandran, G. and Rosakis, A. J. (2001) Observations of transient high temperature vortical microstructures in solids during adiabatic shear banding. Physical Review E, 64 (3). Art. No. 036128. ISSN 1063-651X.

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By using a unique infrared high-speed camera especially constructed for recording highly transient temperature fields at the microscale, we are able to reveal the spatial and temporal microstructure within dynamically growing shear bands in metals. It is found that this structure is highly nonuniform and possesses a transient, short range periodicity in the direction of shear band growth in the form of an array of intense "hot spots" reminiscent of the well-known, shear-induced hydrodynamic instabilities in fluids. This is contrary to the prevailing classical view that describes the deformations and the temperatures within shear bands as being essentially one-dimensional fields. These observations are also reminiscent of the nonuniform structure of localized shear regions believed to exist, at an entirely different length scale, in the earth's lower crust and upper mantle.

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Ravichandran, G.0000-0002-2912-0001
Rosakis, A. J.0000-0003-0559-0794
Additional Information:©2001 The American Physical Society. Received 28 February 2001; published 30 August 2001. This work was supported by the Office of Naval Research Grant No. N00014-95-1-0453 (Dr. Y. D. S. Rajapakse, project manager) and the National Science Foundation Center for Quantitative Visualization at Caltech (Professor M. Gharib, Director). We are also pleased to acknowledge the contributions of Professor A. T. Zehnder, Cornell University for his pivotal role in developing the high-speed IR camera.
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Usage Policy:No commercial reproduction, distribution, display or performance rights in this work are provided.
ID Code:3096
Deposited By: Tony Diaz
Deposited On:15 May 2006
Last Modified:09 Mar 2020 13:19

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