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Alumina-magnesia castable refractory is used for the inner wall of molten steel ladle. The main cause of damage to this refractory is thermal shock caused by a sudden temperature change when putting in and out molten steel. Therefore, there is a thermal shock damage resistance coefficient R"" as a parameter that represents the resistance of refractory materials to thermal shock, and the evaluation of effective fracture energy is important for improving R"". The purpose of this study is todoi:10.2472/jsms.70.451 fatcat:j5k2zl4dnfg5tmcww3kqanwp44