There is a scarcity of multiaxial fatigue data available to designers especially in the high-strain régime. This is due in part of the complexity of the test equipment involved. A servo-hydraulic experimental rig has been developed for the application of biaxial high-strain reversed cycles to thin-walled tubular specimens, i.e. under axial tension and compression and internal and external pressure. It is capable of testing over a wide range of strain ratios and is reasonably versatile in that other information pertaining to buckling, Poisson's ratio, and criteria for yielding can be obtained.
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