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Lifetime prediction of laser-precracked fused silica subjected to subsequent cyclic laser pulses

Published online by Cambridge University Press:  31 January 2011

Faiz Dahmani
Affiliation:
Laboratory for Laser Energetics and Department of Mechanical Engineering, University of Rochester, 250 East River Road, Rochester, New York 14623–1299
Ansgar W. Schmid
Affiliation:
Laboratory for Laser Energetics, University of Rochester, 250 East River Road, Rochester, New York 14623–1299
John C. Lambropoulos
Affiliation:
Laboratory for Laser Energetics and Department of Mechanical Engineering, University of Rochester, 250 East River Road, Rochester, New York 14623–1299
Stephen J. Burns
Affiliation:
Department of Mechanical Engineering, University of Rochester, 250 East River Road, Rochester, New York 14623–1299
Semyon Papernov
Affiliation:
Laboratory for Laser Energetics, University of Rochester, 250 East River Road, Rochester, New York 14623–1299
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Abstract

Measurements of fatigue failure strength of laser-cracked fused silica in air at room temperature for different numbers of laser shots and laser fluences are presented. The failure-strength variability is found to be due mainly to the spectrum of crack depths. Agreement with theory suggests the incorporation of a residual term into the failure–strength equation. Due to its sign, the residual stress is of mouth-opening displacement nature at the crack. Analysis of the residual stress data shows a linear proportionality with crack depth, whereas the failure–strength is inversely proportional to the square root of the crack depth.

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Articles
Copyright
Copyright © Materials Research Society 2000

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