Authors: Heinz Hubner
Addresses: Technische Universitat Hamburg-Harburg, Arbeitsbereich Werkstoffphysik, Harburger Schlosstrasse 20, 2100 Hamburg 90, FRG
Abstract: Failure times and fracture stresses of an electrical porcelain were measured on samples which survived a preceding proof test. The data were compared with predictions made by combining the model of time-dependent strength of ceramics with proof-testing theory. The close coincidence showed that the proof-testing procedure employed was able to eliminate the weak samples without affecting the strength of the survivors. All measured data of failure time and fracture stress of proof-tested samples exceeded the minimum values predicted by the model. It was concluded that proof testing is a suitable means to provide a lower limit of the material|s performance, even under service conditions where subcritical growth of the strength-controlling flaws occurs.
Keywords: ceramic components; fracture stresses; lifetime prediction; proof testing; subcritical crack growth; time-dependent strength; failure time; electrical porcelain; ceramics.
International Journal of Materials and Product Technology, 1987 Vol.2 No.3/4, pp.308 - 318
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