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Cyclic fatigue of a mica-containing glass-ceramic at Hertzian contacts

Published online by Cambridge University Press:  03 March 2011

Hongda Cai ,
Stevens Marion A. Kalceff ,
Bryan M. Hooks ,
Brian R. Lawn  and
Kenneth Chyung
Hongda Cai
Affiliation:
Materials Science and Engineering Laboratory, National Institute of Standards and Technology, Gaithersburg, Maryland 20899
Stevens Marion A. Kalceff
Affiliation:
Materials Science and Engineering Laboratory, National Institute of Standards and Technology, Gaithersburg, Maryland 20899
Bryan M. Hooks
Affiliation:
Materials Science and Engineering Laboratory, National Institute of Standards and Technology, Gaithersburg, Maryland 20899
Brian R. Lawn
Affiliation:
Materials Science and Engineering Laboratory, National Institute of Standards and Technology, Gaithersburg, Maryland 20899
Kenneth Chyung
Affiliation:
Corning Incorporated, Sullivan Park, Corning, New York 14830
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Abstract

Fatigue damage in a mica-containing glass-ceramic is examined using Hertzian contact tests. For the material in its base glass state, such tests indicate that fatigue occurs solely by chemically enhanced cone crack extension. In the glass-ceramic, fatigue is evident as an expansion of a macroscopic subsurface microfracture zone. Comparative observations of the subsurface damage in static and cyclic loading, and tests in different environments, indicate that the fatigue in the glass-ceramic is mechanical in origin, although it is enhanced by moisture. This result is reinforced by load-point-displacement data, which reveal significant hysteresis in the glass-ceramic but not in the base glass. Flexure tests on Hertz-indented glass-ceramic specimens show only a slight loss of strength, <5%, over 105 cycles. This contrasts with the base glass which, although of higher laboratory strength, is subject to abrupt and severe strength degradation from cone crack pop-in. High magnification examination of the subsurface damage in the glass-ceramic suggests the underlying cause of the mechanical fatigue mechanism to be attrition of frictional tractions at closed microcrack interfaces.

Type
Articles
Information
Journal of Materials Research , Volume 9 , Issue 10 , October 1994 , pp. 2654 - 2661
Copyright
Copyright © Materials Research Society 1994

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References

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