小物ばねの疲れ : 電気機器の小物ばね材用疲れ試験機の試作と若干の実験結果

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  • Fatigue Tests on Small-sized Springs : Development of Small-sized Spring Fatigue Testing Machine and Some Experiments of Electrical Apparatus Springs
  • コモノバネ ノ ツカレ

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In presenting this article, it is our desire to describe the development of fatigue testing machine for bent wire springs and shaped springs of flat material in sizes ranging from 0.1 mm to 1 mm diameter or thickness, and also some considerations on the repeated bending fatigue strength of corrosion resistance spring materials ; nickel silver, phosphor bronze, and 18-8 stainless steel. The results indicate that when a cantilever spring is vibrated by applying a force to it at the point 74.5% of the whole length from the fixed end, the effect of circular frequency of excitation in the fatigue test is the smallest. The fatigue strength of 18-8 stainless steel spring is notably increased as the section size of the spring is decreased, but in the case of nickel silver, the size effects on the fatigue strength is small.

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