ESTIMATION OF THERMAL-PROPERTIES AND SURFACE HEAT-FLUX IN CARBON-CARBON COMPOSITE

This article discusses a laboratory method of measurement of the therm al properties of a carbon matrix carbon fiber composite material. Anot her important objective is the determination of the surface heat flux from measured temperatures within the body. This article is unique bec ause the thermal properties are being estimated with known heat flux a nd temperature histories; then the opposite problem of recovering the heat flux history is solved using the estimated values for the thermal properties and temperature history. This calculated heat flux history can then be compared with the measured input heat nux. Results were o btained for a temperature range of 30-600 degrees C. The thermal prope rties demonstrate a presumed quadratic relationship with temperature, and a good agreement between the estimated and measured heat flux hist ories is demonstrated.