高速平面曲げ疲れ試験 : 第4報, 速度依存性に関する理論的考察, その2

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  • High Speed Plane Bending Fatigue Test : 4th Report, Theoretical Consideration on the Speed Dependency, Part 2
  • コウソク ヘイメン マゲ ツカレ シケン ソクド イソンセイ ニ カンスル リロンテキ コウサツ 4 ノ 2

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The number of cycles to cause fatigue fracture had been considered to be proportional to the repetition speed from some theoretical considerations. It was found, however, that the number of cycles is proportional to the square of the repetition speed from testing by means of the high speed fatigue testing machine developed by the author. Theoretical consideration applying dislocation theory was made to explain these phenomena. A dislocation model concerning the preyield plastic and anelastic microstrain, which is a combination of Mason's model for multiplication of dislocation loops and the piling-of-dislocations model for work hardning, was presented here, and analyses were made for the model subjected to alternating stress. The similar tendency to the rheological model described in the 3rd report was noticed. From the consideration, assuming that the vacancies produced at the jog accumulate to produce fatigue crack, the relation between the number of cycles to cause fracture and the speed described above could be explaind and it was also shown that the theoretical S-N curves at the repetition speed of up to 18kc/s are in good agreement with experimental results.

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