Abstract
The paper deals with torsional stiffness and natural frequency of composite corrugated bellows type of expansion joint. In this paper simplified formulae are developed considering thin walled pipe model. Integration method is used to determine the natural frequency of bellows. The EJMA {1} method of calculating the torsional frequency is modified using two different equivalent radii. The results obtained by the modified method are compared with the finite element method and found to be in good agreement.
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