Fatigue Failure and Thermal Spalling Tests to Evaluate Dynamic Fatigue Fracture of MgO–C Bricks
スポンサーリンク
概要
- 論文の詳細を見る
The relationship between compressive stress and loading cycles in MgO–C bricks with various carbon contents was investigated at room temperature and high temperature. The relationship between fatigue failure and thermal spalling was investigated by estimating a characteristic material constant, which represents the degree of sensitivity of crack growth, in terms of fracture mechanics. The relationship between the ratio of compressive stress for compressive strength and loading cycles in MgO–C bricks is not affected by the temperature of the atmosphere. At the same acting stress ratio, fatigue fracture life decreased as the carbon content in the MgO–C bricks decreased. In the thermal spalling test, the number of heating cycles at which small cracks and large cracks were generated decreased as the carbon content decreased. In the fatigue failure test, the ratio of the dynamic elastic modulus to the initial elastic modulus decreased gradually. This ratio also showed a gradual decrease in the thermal spalling test as the number of heating cycles increased. A characteristic material constant was obtained and compared based on the results of a fracture mechanics discussion. The characteristic material constant obtained from the fatigue failure test was substantially the same as that obtained from the thermal spalling test. From this, a relationship in which crack growth behavior leading to fatigue failure is equivalent to that of thermal spalling in MgO–C brick was recognized.
論文 | ランダム
- 最近経験した母児間 Rh 因子不適合の症例の検討
- 224 レーザ溶接におけるキーホール内プラズマの性質 : レーザ誘起プラズマの解析(第5報)
- 子宮筋の収縮性に対する性ホルモン並びに妊娠の影響に関する実験的研究
- 112 プラズマ発光の検出による溶接欠陥のモニタリング : レーザ溶接のインプロセスモニタリングに関する研究(第2報)
- 111 プラズマ発光の検出角度特性 : レーザ溶接のインプロセスモニタリングの研究(第1報)