Abstract
Assessing the reliability of non-destructive testing (NDT) techniques in detecting in-service fatigue cracks is vital for ensuring the structural integrity of aero engines. However, the requirement of a large number of in-service failed components with numerous initiating fatigue cracks makes it a cost-intensive methodology. Hence, laboratory samples with electrical discharge machined (EDM) notches representing fatigue cracks have also been used for NDT reliability studies. However, probability of detection (POD), a measure of NDT reliability, is usually a function of all crack dimensions rather than only length. This limits the applicability of EDM notches (minimum width of notch ~0.3 mm) as artificial fatigue cracks for POD studies. The current study demonstrates the methodology of generating cracks under laboratory conditions in nickel-based superalloy samples (representative aero engine material), mimicking in-service conditions such as crack tightness as low as 1 μm, crack tortuosity, transgranular nature, crack branching and multiple initiation sites of cracks. POD curves generated using these samples are demonstrated and the feasibility of this approach is discussed.
Talk to us
Join us for a 30 min session where you can share your feedback and ask us any queries you have
Schedule a callMore From: Insight - Non-Destructive Testing and Condition Monitoring
Disclaimer: All third-party content on this website/platform is and will remain the property of their respective owners and is provided on "as is" basis without any warranties, express or implied. Use of third-party content does not indicate any affiliation, sponsorship with or endorsement by them. Any references to third-party content is to identify the corresponding services and shall be considered fair use under The CopyrightLaw.
