高速平面曲げ疲れ試験 : 第1報, 疲れ試験機について

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  • High Speed Plane Bending Fatigue Test : 1st Report, On the Fatigue Testing Machine
  • コウソク ヘイメン マゲ ツカレ シケン 1

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In order to investigate the effect of speed of stress reversal on the endurance limit, and to reduce the time needed for fatigue test, a high speed pneumatic fatigue testing machine has been developed. High-frequency siren (air-interrupter) type exciter is used as a reversed plane bending type testing machine for the frequency range of 3 to 20 kc/s. Specimen is a uniform bar of the rectangular cross section, vibrating in the first free-free mode, and is supported by steel wires at the nodal points. Tests were made on normalised 0.36 % carbon steel at frequencies up to 18 kc/s. In order to compare the endurance limit at high speed with that at ordinary speed, the same material was tested by ordinary plane bending machine and rotary bending machine. The endurance limit has a tendency of increase with the increase of reversal speed, and the one at 18 kc/s was about 68% higher than that at the ordinary speed.

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