Graphite material has been widely used in rocket nozzle throat due to its excellent thermal properties. However, compared with typical structural material, graphite is relatively weak with respect to both strength and toughness due to its quasi brittl...
Graphite material has been widely used in rocket nozzle throat due to its excellent thermal properties. However, compared with typical structural material, graphite is relatively weak with respect to both strength and toughness due to its quasi brittle behavior and gets oxidized at 450°C. Therefore it is important to evaluate mechanical properties of this material for application. This study presents an experimental method to investigate fracture behavior of ATJ graphite at elevated temperature. In particular, temperature, loading and oxidation conditions are major parameter to investigate the relationship of strength and fracture characteristics. Uniaxial tests are conducted in accordance with ASTM in the range of R.T to 1,000°C. Fractography analysis of fractured specimens are carried out using SEM