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Analysis of macroscopic crack branching patterns in chemically strengthened glass

Published online by Cambridge University Press:  31 January 2011

J.E. Kooi ,
R. Tandon ,
S.J. Glass  and
J.J. Mecholsky Jr.
J.E. Kooi
Affiliation:
New Mexico Tech, Socorro, New Mexico 87801
R. Tandon*
Affiliation:
Sandia National Laboratories, Albuquerque, New Mexico 87185
S.J. Glass
Affiliation:
Sandia National Laboratories, Albuquerque, New Mexico 87185
J.J. Mecholsky Jr.
Affiliation:
University of Florida, Gainesville, Florida 32611
*
a)Address all correspondence to this author. e-mail: [email protected]
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Abstract

Residual stress profiles were introduced in sodium aluminosilicate glass disks using an ion-exchange process. They were fractured in two loading conditions: indentation and biaxial flexure. The fractal dimension of the macroscopic crack branching pattern called the crack branching coefficient (CBC), as well as the number of fragments (NOF) were used to quantify the crack patterns. The fracture surfaces were analyzed to determine the stresses responsible for the crack branching patterns. The total strain energy in the body was calculated. The CBC was a good measure of the NOF. They are directly related to the tensile strain energy due to the residual stress profile for fractures due to indentation loading. However, in general for materials with residual stresses, CBC (or NOF) is not related to the strength or the stress at fracture, or even to the total stored tensile strain energy. Instead, the CBC appears to be related, in a complex manner, to the distribution of stresses in the body. Therefore, in general, the characterization of the CBC of fractured materials cannot be used to ascertain the prior stress distribution.

Keywords

FractalFractureIon-exchange material
Type
Articles
Information
Journal of Materials Research , Volume 23 , Issue 1 , January 2008 , pp. 214 - 225
Copyright
Copyright © Materials Research Society 2008

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