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Weibull analysis of ceramics under high stress gradients

Fett, T.; Ernst, E.; Munz, D.; Badenheim, D.; Oberacker, R.

Abstract: The Weibull parameter in of the strength distribution of ceramics under high stress gradients differs from that for moderate stress gradients. This is shown for contact loading. Bars were loaded by oppositely concentrated forcers via rollers. For most investigated materials, measured contact strengths showed strongly reduced Weibull exponents compared with those from 4-point bending tests. This was the reason for a study, in which the effective volumes and surfaces for the two tests were compared and the influence of the strong stress gradients was considered. Under the assumption of the Weibull theory being valid, the effective surfaces and volumes were computed for the normal stress and the energy release rate criteria. In the second part, it will be shown that the strongly nonhomogeneous stresses lead to a reduced Weibull exponent.


Zugehörige Institution(en) am KIT Institut für Keramik im Maschinenbau (IKM)
Institut für Materialforschung (IMF)
Publikationstyp Zeitschriftenaufsatz
Jahr 2003
Sprache Englisch
Identifikator ISSN: 0955-2219
KITopen ID: 1000007666
HGF-Programm 41.03.03; LK 01
Erschienen in Journal of the European Ceramic Society
Band 23
Heft 12
Seiten 2031-2037
URLs Volltext_(für_Abonnenten)
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