Novel Multi-Axial Fatigue Analysis Tool for Dynamic Components using Frequency Domain Method

Challenges in the assessment of fatigue and durability of dynamic components require the development of an innovative tool that is able to include the advantages of both time and frequency domain methodologies. Different flight regimes imply different static and quasi-static applied loads, but they also excite different dynamic responses of the structure; this causes the stresses at a critical location to be a combination of quasi-static loads and dynamic vibrations.To ensure the safety, readiness and future condition of aircrafts, an innovative methodology that allows the definition and tracking of damage at structural hot spots is proposed in this work. The methodology is a hybrid time-frequency alternating-domain approach that considers the effects of load interaction, local plastic deformations, and changes in dynamic response of the structure. Verification and validation of the developed methodology are going to be performed in collaboration with the University of Maryland, Center for Advanced Life Cycle Engineering.