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Standards Development
This document specifies the design of arc-shaped tube specimens, fixtures, and fatigue testing methods for uniaxial fatigue performance evaluation. A stress mapping coefficient k is introduced to characterize the mapping relationship between the fatigue performance of individual tubes and that of tube assemblies. The proposal provides a unified basis and guidance for characterizing and decoupling the fatigue performance of small-diameter, thin-walled metallic tubes.
In modern industrial hydraulic systems, small-diameter thin-walled metallic tubes are highly susceptible to premature failure and off-gauge ruptures at the clamped ends during single-tube axial-fatigue testing because of severe stress concentration.
Moreover, rotating-bending-fatigue tests performed on complete tube assemblies are intentionally designed with large safety margins to meet extreme reliability and safety requirements; these margins mask the true fatigue performance of the individual tube.
As hydraulic systems are pushed toward ever-higher performance and pressure levels, there is an urgent need for a new standard that specifies how to characterize and decouple the intrinsic fatigue properties of the single small-bore, thin-walled tube itself.
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