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Shear bands and cracking of metallic glass plates in bending

Conner, R. D. and Johnson, W. L. and Paton, N. E. and Nix, W. D. (2003) Shear bands and cracking of metallic glass plates in bending. Journal of Applied Physics, 94 (2). pp. 904-911. ISSN 0021-8979. doi:10.1063/1.1582555.

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The thickness dependence of yielding and fracture of metallic glass plates subjected to bending is considered in terms of the shear band processes responsible for these properties. We argue that the shear band spacing (and length) scales with the thickness of the plate because of strain relaxation in the vicinity of the shear band at the surface. This is consistent with recent measurements of shear band spacing versus sample size. We also argue that the shear displacements in the shear band scale with the shear band length and plate thickness, thus causing cracks to be initiated in thicker plates at smaller bending strains. This leads to fracture bending strains that decrease markedly with increasing plate thickness, consistent with recent experiments. These results suggest that amorphous metals in the form of foams might have superior ductility and toughness.

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Additional Information:©2003 American Institute of Physics. (Received 17 February 2003; accepted 24 April 2003) The authors gratefully acknowledge financial support for this work from the Defense Advanced Research Projects Agency (DARPA), under ARO Contract No. DAAD 19-01-1-0525, and Dr. Leo Christodoulou as Program Manager. (Approved for Public Release, Distribution Unlimited. Case No. 41829). The assistance of Wendelin J. Wright of Stanford University in connection with the preparation of this manuscript is also much appreciated.
Subject Keywords:metallic glasses; metallic thin films; crystallographic shear; bending; fracture; cracks; shear deformation; yield stress; stress relaxation
Issue or Number:2
Record Number:CaltechAUTHORS:CONjap03
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Usage Policy:No commercial reproduction, distribution, display or performance rights in this work are provided.
ID Code:1901
Deposited By: Archive Administrator
Deposited On:23 Feb 2006
Last Modified:08 Nov 2021 19:43

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