Comparison of phenomenological and crystallographic models for single crystal nickel base superalloys. I. Analytical identification

The general formulations of a phenomenological model and a crystallographic model are developed. These models describe the anisotropic viscoplastic de formation of single crystal nickel base superalloys. The two models are the n applied to simple uniaxial loading to identify suitable tests for determi ning the material constants. A group of generic equations has been identifi ed for both models, which can be applied to uniaxial loading in the [0 0 1] and [1 1 1] orientations. Consequently, a consistent procedure is proposed that determines the material constants for the two models using same exper imental results. This permits direct comparison of the intrinsic characteri stics of the two models. (C) 2001 Published by Elsevier Science Ltd.