Models for calculating fatigue life of surface damaged safety critical rotating parts subjected to primary engine flows and service induced damages are to be developed. The surface damage may be classified as “nicks, dents and scratches” originating either from the manufacturing and assembly process or service induced, the damage is random in nature and variations in shape and residual stress state is therefore to be expected. The project aims to investigate the impact on fatigue on alloy 718 from a variety of damages. The goal of the project is to develop a methodology for life analysis from surface damages. The main variables affecting the life predictions need to be identified and included in the life model. Finally procedure to predict safe life (failure rate less than 0.1%) is to be developed. Please refer to the full topic descriptions document published in this call.