Strength and Fatigue of Silicon Nitride/Silicon Nitride and Alumina/Alumina Joints

• SASAKI Kazunori

  Hiroshima Denki Institute of Technology

• MOTOIE Katsuhiko

  Hiroshima Denki Institute of Technology

• KAWASAKI Tadashi

  Hiroshima Denki Institute of Technology

抄録

To investigate the fatigue behavior of bonded ceramics, Si_3N_4/Si_3N_4 and Al_2O_3/Al_2O_3 joint specimens were three-point-fatigue-tested under static and cyclic loading at temperatures ranging from 300 to 1038K in air. Fractographic observation was also carried out using SEM after the fatigue test. Restriction of the strain in the joining layer due to the difference in Young's modulus between ceramics and metals causes triaxial tension in the tension side of the joining layer, accelerating the formation of small cavities. Therefore the process of strength degradation owing to fatigue is controlled by the rate of either the cavity growth or the crack growth, depending on which one is dominant. At low temperatures, the fatigue process is mainly controlled by crack growth ; on the other hand, formation of small cavity and its growth seem to be predominant factors in controlling the fatigue process at high temperatures. Therefore, the triaxial tensile stress component is a very important factor in evaluating the fatigue life of joints at high temperatures. However, a fairly good estimation of the fatigue life is obtained using nominal bending stress in the present investigation. It is also found that the fatigue life can be estimated using the bending strength of Joints.

収録刊行物

• JSME international journal. Ser. A, Mechanics and material engineering

  JSME international journal. Ser. A, Mechanics and material engineering 39 (1), 9-17, 1996-01-01

  一般社団法人日本機械学会

キーワード

• Ceramics
• Fatigue at Elevated Temperature
• Life Prediction
• Crack Propagation
• Bending

詳細情報

• CRID: 1571135652157932672
• NII論文ID: 110002964427
• NII書誌ID: AA10888746
• ISSN: 09148809
• 本文言語コード: en
• データソース種別:
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