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With a high precision, high temperature uniaxial testing facility the stress-stain behaviour in tension-compression cyclic load-controlled tests was carefully examined for a silicon nitride ceramic. The ceramic's partially glassy grain boundary phase induces the opening of the stress-strain loop, the area of which is a measure of the dissipated energy. The temperature, frequency and stress amplitude dependencies of the measured energy dissipation have been investigated. The obtained results indicate that the energy dissipation becomes more imporant at the higher temperatures and stress amplitudes, and at decreasing frequencies. The energy dissipation per unit of time increases with test frequency. It can hence explain the longer lifetimes observed under cyclic loading compared to those under static loading reported in literature.

Additional information

Authors: ROEBBEN G, JRC Petten (NL);STEEN M, JRC Petten (NL);VAN DER BIEST O, Leuven University, Department of Metallurgy and Materials Engineering (BE)
Bibliographic Reference: Paper presented: 6th International Congress on Fatigue, May 6-10, 1996
Availability: Available from (1) as Paper EN 39620 ORA
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