SYMPOSIA PAPER Published: 01 January 1994
STP12781S

Lifetime Prediction for Ceramic Materials Under Constant and Cyclic Load

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Subcritical crack growth under static and cyclic loads is an important failure mode and often responsible for delayed failure. At least for subcritical crack extension under constant load it is a well-known fact that the crack growth behaviour of natural cracks differs significantly from that of macroscopic cracks, especially for such materials exhibiting a pronounced R-curve behaviour. The influence of bridging surface interactions — responsible for R-curves in alumina (Al2O3) — will be discussed with respect to strength and static lifetimes. Experimental results obtained for both loading cases are presented for alumina. Measured lifetimes are significantly shorter than the predictions and a reduction of lifetimes is found for increasing frequencies. From these results an effect of cycles becomes obvious and it can be concluded that a real cyclic fatigue effect occurs.

Author Information

Fett, T
Kernforschungszentrum Karlsruhe, Institut für Materialforschung II
Munz, D
Universität Karlsruhe, Institut für Zuverlässigkeit und Schadenskunde im Maschinenbau, and Kernforschungszentrum Karlsruhe, Institut für Materialforschung II, Karlsruhe, Germany
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Details
Developed by Committee: C28
Pages: 161–174
DOI: 10.1520/STP12781S
ISBN-EB: 978-0-8031-5268-7
ISBN-13: 978-0-8031-1864-5