Prediction of metallic materials creep deformation under multiaxial stress state

Abstract

A simple function of multiaxial creep is presented hereafter. This is derived from a uniaxial creep function with only three fitting parameters. For the derivation of the multiaxial function the only assumption made was the one of material's isotropy. With the additional assumption of constant volume, the function leads to a v. Mises‐type function of multiaxial creep. The equivalent stress employed has a simple form as well and leads to the v. Mises equivalent stress. The derived curves agree with the experiments, not only the ones carried out in the laboratory but also the ones taken from literature.