Abstract
Experimental studies were performed to investigate the resonance frequency and damping behavior of carbon-carbon (C-C) composite specimens. Initially, the resonance frequency and damping-ratio values of the as-cured composite (graphite fabric impregnated with phenolic resin, referred to as the as-cured stage) specimens were measured. These parameters were measured again after subjecting the specimens to carbonization to a temperature of 800°C (referred to as the carbonized composite) in an inert atmosphere. It was observed that the specimens at the carbonized stage showed a reduction in resonance frequency and an increase in damping-ratio value. The microstructure of the specimens was studied using optical microscopy. The changes in resonance frequency and damping-ratio values were then related to the microstructure of the composite.
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