High Speed Plane Bending Fatigue Test : 4th Report, Theoretical Consideration on the Speed Dependency, Part 2 (the Journal and the Transactions of the Japan Society of Mechanical Engineers)

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概要

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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 18 kc/sec are in good agreement with experimental results.

• 一般社団法人日本機械学会の論文

著者

• Yamane Masami

  Central Research Laboratory Hitachi Ltd.

関連論文

• Very High Speed Plane Bending Fatigue Test : (1st Report, On The Fatigue Testing Machine)
• High Speed Plane Bending Fatigue Test : 4th Report, Theoretical Consideration on the Speed Dependency, Part 2 (the Journal and the Transactions of the Japan Society of Mechanical Engineers)
• High Speed Plane Bending Fatigue Test : 2nd Report, On the Speed Dependency of the Endurance Limit

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