Failure of an austenitic stainless steel under linear and non- linear loading paths

Abstract eng:
The failure limits of 304L austenitic stainless steel are measured under linear and non-linear loading paths. The experiments involve inflation of microtubes under axial load and internal pressure. Depending on whether the axial or the hoop stress is greater, the tubes fail by an axial or a circumferential rupture, respectively. The limits of uniform elongation were seen to exhibit significant anisotropy. The non-linear loading paths probed the path-dependence of failure, which was clearly found to be present not only for the strains, but also for the stresses at failure. The results can be used to inform numerical analyses of tube forming processes.

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