Study on Hydroformed Bellows(1st Report)

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  • 成形ベローズに関する研究(第1報)
  • 成形ベローズに関する研究-1-寸法,形状とばね定数の相関について
  • セイケイ ベローズ ニ カンスル ケンキュウ 1 スンポウ ケイジョウ ト バ
  • Relations of Bellows Dimensions, Shape and Spring Rate
  • 寸法,形状とばね定数の相関について

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The spring rate of hydroformed bellows were generally calculated by shell theory solution or energy solution. In both cases, the calculation model of the bellows will be simplified and the thickness of the bellows convolutions will be assumed as a uniform thickness plate. And the calculation solutions were often different from the experimental spring rates. Since the sectional thickness of hydroformed bellows is different at outer side of bellows or inner side of bellows, a finite element method was applied to get the spring rate of the bellows in this paper. The calculated spring rates were almost same as those of experimental data. The calculated spring rates indicate the ratio of OD thickness and ID thickness is very delicate to the spring rate values. Therefore, this paper proposes that the finite element method will be effective to estimate the accurate spring rate of bellows, because the ratio of OD thickness and ID thickness can be reflected in the calculation easily.

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