Titel: Thickness-dependence of the breakdown strength: analysis of the dielectric and mechanical failure
Sprache: Englisch
Autor/Autorin: Neusel, Claudia
Jelitto, Hans
Schmidt, Dieter
Janßen, Rolf
Felten, Frank
Schneider, Gerold A.
Schlagwörter: Durchschlagsfestigkeit, Dickenabhängigkeit, Weibull Modul, Bruchfestigkeit, Volumeneffekt;Breakdown strength, Thickness-dependence, Weibull modulus, Fracture Strength; Volume effect
Erscheinungsdatum: 2014
Quellenangabe: Journal of the European Ceramic Society, Volume 35, Issue 1, January 2015, Pages 113-123
Zusammenfassung (englisch): 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.
URI: http://tubdok.tub.tuhh.de/handle/11420/1192
URN: urn:nbn:de:gbv:830-tubdok-12925
DOI: 10.15480/882.1190
Institut: Keramische Hochleistungswerkstoffe M-9
Advanced Ceramics M-9
Dokumenttyp: ResearchPaper
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