Note: Presentations may start a few minutes before the time listed in the schedule.
In the light of rising demands on the efficiency and flexibility of turbomachines, the application of damage tolerant lifing approaches has become an essential tool from the very preliminary activity of material selection, during the design of new components to the maintenance of the existing fleet. [1] This tutorial provides an in-depth introduction to fracture mechanics principles and their applications in assessing the lifecycle of turbomachinery components. [2–4] Participants will be introduced to fracture mechanic principles to describe crack tip loading and standard methods to measure crack growth. Critical factors influencing crack initiation, propagation, and arrest in components subjected to complex thermal and mechanical loads are explored. In an in-depth review, the role of microstructure and operational conditions on crack growth mechanisms under creep-fatigue and TMF scenarios will be discussed to show how local deformation behavior, grain structure, and stress ratios influence crack initiation and growth rates. [5,6] Furthermore, more recent findings on the measurement and modelling of high temperature fatigue thresholds are presented. This segment will introduce cyclic R-curves as an advanced method for assessing short crack behavior, linking fatigue limits with fracture mechanics. [7–10] Through this tutorial, participants will gain in-depth knowledge to apply fracture mechanics-based methodologies to enhance the reliability and safety of critical turbomachinery components.
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TOB-25-01: FRACTURE MECHANICS BASED FATIGUE LIFE APPROACHES
