The effect of material behaviour on the analysis of single crystal turbine blades: material model development

A crystal slip system model has been developed for the analysis of gas turbine single crystal Ni-base superalloys and has beenimplemented in nite element analysis software using the established theory of crystal plasticity. The model incorporates many ofthe dominant deformation mechanisms seen in these high temperature materials, which have been determined from mechanical testing and microscopic analysis. In particular slip is considered on the {111} and {111} slip systems, the former aredenoted type I systems and the latter type II. Type I systems are dominant at high temperature in orientations close to [001], in other orientations or at lower temperatures (700800.C) type II systems become active. When the type II systems are activated theygive rise to signicant transient creep strains at low temperature, which can be more than 5-6% in magnitude. KCI Citation Count: 3