Thickness-dependence of the breakdown strength: analysis of the dielectric and mechanical failure

Claudia Neusel, Hans Jelitto, Dieter Schmidt, Rolf Janßen, Frank Felten & Gerold A. Schneider
The breakdown strength as well as the mechanical strength of ceramic materials decreases with increasing volume. The volume-effect of the mechanical strength can be explained by the Weibull theory. For the breakdown strength the same explanation has been often assumed. In order to validate this assumption breakdown strength and mechanical strength of alumina samples with defined porosities were compared. Differences in the Weibull moduli of breakdown and mechanical strength distributions indicate that the volume-effect cannot...
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