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Abstract
In order to estimate the fatigue life of welded bellows, so far, the fatigue test has been carried out using actual welded bellows, so that it took much money and time to develop a new type of welded bellows. In the present investigation, the S-N curve of welded bellows plotted against the stress amplitude calculated by the finite-element method and the S-N curve of a thin plate for welded bellows have been compared. As a result, it was found that although the fatigue life varies depending on the speed in the fatigue test, the S-N curve of the welded bellows is in close agreement with the S-N curve of a thin plate of welded bellows at the same test speed. Therefore, it is possible to estimate the fatigue life of actual welded bellows accurately utilizing the S-N curve of the thin plate of welded bellows, which is modified by the test speed.
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