Study and Modelling of the Mechanical Behaviour of a Nickel-Base Single CrystalSuperalloy for Turbine Blade

摘要

The experimental survey characterizes the mechanical anisotropy in several ways:elasticity, flow stress, initial hardening, and induced hardening, under both monotonic anbd cyclic uniaxial loading. Microscopic mechanisms of plastic deformation are studied (with optical and transmission electron microscopy) in order to gain a better understanding of the complex mechanical response of the material observed experimentally. A review of the literature on the various models for the behavior of anisotropic bodies is made and two particular modeling levels are selected and developed: the first lies within the context of the mechanics of continuous media and is based on theories involving tensor function representations; and the second takes into account experimental observations by introducing slip systems and describes the effects of microscopic mechanisms through internal phenomenological variables. This model can simulate experimental results quite well and is a basic tool for the simulation of multiaxial loading.