Application of multi-scale modelling in aeroengine component life assessment

The paper provides an overview of the procedures used to determine the safe service lives of aeroengine components, with particular reference to the role of scale in lifing models. It is shown how the volume of material tested influences the declared service life of fracture critical components. The development of a combined micromechanical–macromechanical model for the life assessment of the anisotropic behaviour of advanced single crystal turbine blade materials is discussed. The role of micro-scale modelling in predicting the low cycle fatigue (LCF) behaviour of long fibre metal matrix composite components is also discussed. The final case considered is that of al microstructural model used in the life assessment of ceramic matrix composites.