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Estimation of endurance of structural ceramics by dynamic fatigue testing

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Abstract

Results of investigations on determining the level of the control load in certification of ceramic articles at specified operating loads are presented. The parameters of subcritical crack growth, required for the calculation, have been determined using the results of dynamic fatigue testing. It is demonstrated that the parameters of subcritical crack growth determined by dynamic fatigue testing are adequate for use in calculating control loads in cases of operating loads with a high subcritical stress intensity at structural defects (K I <K Ic). For long-term conditions of operating loads, the estimates of the endurance made by the present method will be lower than the actual values. The effectiveness of control tests under the specified conditions of the operating load has been demonstrated in an experiment with two batches of specimens of compacted chemically bound silicon nitride (OTM 907). The results of dynamic fatigue testing of silicon nitride are also given.

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Translated from Ogneupory, No. 5, pp. 14 – 18, May, 1994.

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Dobrinskii, Y.I., Vikulin, V.V. & Rudykina, V.N. Estimation of endurance of structural ceramics by dynamic fatigue testing. Refractories 35, 154–158 (1994). https://doi.org/10.1007/BF02227380

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Keywords

  • Silicon
  • Fatigue
  • Nitride
  • Stress Intensity
  • Structural Defect