Paper number 129

CREEP OF A C/C-SIC COMPOSITE UNDER INTERLAMINAR SHEAR LOADING AT HIGH TEMPERATURES

Bärbel Thielicke¹ , Uwe Soltész¹ , Walter Krenkel² , Katerina Morawietz³

1Fraunhofer-Institut für Werkstoffmechanik, Wöhlerstr. 11, 79108 Freiburg, Germany
2Deutsches Zentrum für Luft- und Raumfahrt, Pfaffenwaldring 38, 70569 Stuttgart, Germany
3Fraunhofer-Institut für Werkstoffmechanik, Heideallee 19, 6120 Halle, Germany

Summary

A laminated fiber-reinforced ceramic was investigated with respect to possible creep effects. Because creep effects, if at all, were expected to be caused by the matrix properties, a predominant interlaminar shear loading was applied. It was realized by the compression-shear-test using unsymmetrically grooved specimens. First indications for interlaminar creep were found above 1450°C. At 1800°C and loads of 60% and 70% of the failure load nonlinear deformations can be measured. In order to check whether the properties of the test material have changed due to creep loading, additionally, the residual strengths for the interlaminar shear (ILSS) were determined at the temperature considered and the structure of the material was investigated microscopically in the states before and after thermomechanical loading.

Keywords

C/C-SiC, High Temperature Testing, Creep, Interlaminar Shear Strength, ILSS.