新しい共振形引張圧縮疲れ試験機

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タイトル別名
  • A New Direct Stress Fatigue Testing Machine of Resonant Type
  • アタラシイ キョウシンケイ ヒッパリ アッシュク ツカレ シケンキ

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抄録

A new direct stress fatigue testing machine which operates in a perfectly resonant condition under a new principle is devised and constructed. In this machine repeated load is applied to a specimen by the inertia force of the mass forcibly vibrated by a crank and link mechanism just in a resonant condition. The amplitude of the vibration can be adjusted mechanically from zero to an arbitary magnitude in operating condition without stopping the machine. So the starting is easy and the amplitude is kept strictly constant without any automatic control apparutus. The machine is a horizontal type, one end of the specimen is fixed on the dynamometer side and the other on the spring side. The end of the dynamic load spring is forcibly vibrated by the vertical link oscillated around a movable support. When the support is situated at the top of the vertical slit, the amplitude becomes zero. In this state the machine is started. After the driving speed arrives at resonance, the support is gradually lowered, then the amplitude increases centinuously. Fixing the support at an appropriate position, the expected load amplitude can be obtained. The resonant frequency can be regulated by adjusting the oscillating mass. A preload spring is located outside of the dynamic load spring, so fatigue tests under any mean stress can be carried out. The machine is proved to be satisfactory in operation. Some experiments are made on smooth specimens, notched specimens, and others.

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