New Resonance Type Fatigue Testing Machine

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 a repeated load is applied to a specimen by the inertia force of a 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 arbitrary magnitude in operating condition without stopping the machine. So the starting is easy and the amplitude is kept strictly constant without any automatic control apparatus. The machine is proved to be satisfactory in operation. Some experiments are made on smooth specimens, notched specimens, and others.