Abstract
Dynamic buckling characteristics of bellows for piping expansion joints are discussed through experimental results and their pseudo-dynamic analyses, aiming at their application to the secondary piping systems of LMFBRs. A series of dynamic buckling tests was conducted in a water loop by using slow explosives to generate pressure waves, which simulate those in a sodium-water reaction in a steam generator. Scale bellows of about 300 mm in diameter were used. The principal test parameters were pressure-wave configurations and the number of convolutions of bellows. It has been clarified from this study that (1) the buckling strength of the bellows was seen to increase when the duration of the applied pressure wave was shorter than a certain critical value, (2) the dynamic buckling characteristics are different from the static ones, (3) the energy impulse, which is deduced from the product of peak pressure and an integration of a pressure history, is an effective parameter to estimate the dynamic buckling behavior of bellows, and (4) the increase in the dynamic buckling may be explained, at least partly, by the hardening of the material when loaded by a very fast pressure wave.
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