APPLICATION OF MATERIALS CHARACTERISATION TO STRESSING AND LIFING OF AEROENGINE FRACTURE CRITICAL COMPONENTS

摘要

Advanced materials characterisation is being used to develop constitutive models to characterise the response of aeroengine materials to the complex loading cycles experienced within today's gas turbine engines. The paper identifies the effects of residual stresses introduced during processing of the original billet. It also shows briefly how the effects of heat treatment and local yielding within the disc must be taken into account in component life prediction. Application of the UK fracture mechanics based databank approach to the prediction of service lives for fracture critical components is described. It is shown that although a crack tolerant design might double the declared life in major reference cycles, the operator may well realise only about a 30% increase in the number of flights that can be undertaken.