Abstract
The ratcheting mechanism of a bellows under a pressure load and a cyclic-displacement load is studied. In this paper, it is shown that the ratcheting mechanism of bellows cannot be explained by conventional ratcheting models, such as a parallel two-bar model or the Bree model. In order to represent the ratcheting behavior of bellows, the authors assume that this mechanism is governed by the interaction of bending moments between the crown and the root of each convolution, and they develop a rational-analysis model by using a rectangular beam. The model is extended to bellows, and a simplified evaluation method to predict the ratcheting limit and the enhanced creep strain is proposed. The validity of this method is verified by FEM analyses and experiments.
Published Version
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