High-temperature dynamic mechanical testing of ceramic fibers: Apparatus and preliminary results

A test apparatus is described for the dynamic testing of single ceramic fibers from room temperature to 1600°C using forced vibration sine wave displacements from 0.1 to 25 Hz. Both storage (elastic, real or in-phase) and loss (dissipative, imaginary or out-of-phase) components of the dynamic modulus are obtained. The deconvolution equations required to extract isothermal data from a non-uniform (parabolic) temperature distribution are presented. Preliminary data on sapphire filaments and CVD silicon carbide fibers are discussed. The results show the validity of the testing method and data, which are in good agreement with available literature data on similar materials.