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

Citation Link: https://doi.org/10.15480/882.1190
Publikationstyp
Journal Article
Date Issued
2014
Sprache
English
Author(s)
Neusel, Claudia  
Jelitto, Hans  
Schmidt, Dieter  
Janßen, Rolf  
Felten, Frank  
Schneider, Gerold A.  
Institut
Keramische Hochleistungswerkstoffe M-9  
TORE-DOI
10.15480/882.1190
TORE-URI
http://tubdok.tub.tuhh.de/handle/11420/1192
Journal
Journal of the European Ceramic Society  
Volume
35
Issue
1
Start Page
113
End Page
123
Citation
Journal of the European Ceramic Society, Volume 35, Issue 1, January 2015, Pages 113-123
Publisher DOI
10.1016/j.jeurceramsoc.2014.08.028
Scopus ID
2-s2.0-85027926329
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 explain the thickness-dependence of the breakdown strength. In particular, the thickness-dependence of the breakdown strength always leads to a Weibull modulus of two which is not in agreement with the measured Weibull moduli for samples with constant thickness. It can be concluded that the thickness-dependence of the breakdown strength cannot be explained by the Weibull concept. A recently developed breakdown model which is based on space charge injection is able to explain the experimental results.
Subjects
Durchschlagsfestigkeit, Dickenabhängigkeit, Weibull Modul, Bruchfestigkeit, Volumeneffekt
Breakdown strength, Thickness-dependence, Weibull modulus, Fracture Strength; Volume effect
Lizenz
http://doku.b.tu-harburg.de/doku/lic_ohne_pod.php
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