脱塵フィルター用多孔質炭化ケイ素の繰返し疲労寿命

概要

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A new low-capacity fatigue testing machine was developed to evaluate the cyclic fatigue behavior of porous ceramics used for dust filters.Cyclic fatigue tests were conducted by cyclic four-point bending with the stress ratio 0.5 at a room temperature.The results were summarized as follows : (1)The distribution of cyclic fatigue life at a given stress level can be expressed as a two-parameters Weibull distribution.From the Weibull distribution of the life, the exponent of the crack propagation equation as a function of the dtress intensity factor was estimated to be 25.3.(2)The fatigue life decreased with increasing maximum stress.The relation between the maximum stress, σ_max, and the fatigue life N, was expressed as σ_max~nN=const.The exponent of the crack propagation equation determined from the S-N relation was 20.3 which was close to the value determined of the life distribution.(3)Cyclic loading induced a residual bending deformation in the specimen.The amount of residual deformation increased with increasing number of stress cycles.
社団法人日本材料学会の論文
2000-03-15