Abstract
A new viscoelastic material model was developed to describe deformations under various loads at the high-temperature creep regime. In the model the inelastic strain rate is written in the form of a flow equation of the Norton-Bailey type and the material hardening during deformation under various loads is induced by an internal stress which is subdivided into back stress and friction stress. The back stress represents a conservative part of the creep resistance while the friction stress includes all the dissipative parts in the internal structure such as grain boundary sliding, diffusion and interaction between dislocation and precipitation. An inelastic constitutive equation is established based on the new viscoelastic material model. A case study was done for Hastelloy XR, a Ni-based superalloy. Deformation analyses show a good agreement between calculations and experimental results for creep, relaxation, tensile and stress dip tests.
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