Bladed Disk Vibration Dynamics
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Abstract
Abstract
To resolve the fatigue fracture occurring at the tip trailing edge of thin-walled single-crystal turbine rotor blades for a specific aero-engine, this paper derives the relationship between the single-crystal constitutive stiffness matrix and crystal orientation, and clarifies the influence mechanism of crystal orientation on blade-vibration characteristics. The influence rules and degrees of uncertain parameters on the vibration characteristics of thin-walled and thickened-profile blades are comparatively investigated. The results reveal that blade dynamic frequency is strongly affected by both blade profile thickness and crystal orientation, and blade profile optimization can effectively weaken the effects of crystal orientation and blade thickness on the dynamic frequency of critical modes. Based on the above results, the hazardous resonance overlooked in conventional engineering approaches is detected using uncertainty-based vibration analysis. The corresponding failure mechanism is illustrated, the resonant speed range is determined, and the risk of bending–torsion coupled flutter is detected. The outcomes provide valuable guidance for the frequency tuning design of turbine blades.
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@article{Jiang2026Failure,
title = {Failure Mechanism of Tip-Trailing-Edge Fracture in a Thin-Walled Single-Crystal Turbine Blade: An Uncertainty-Based Vibration Analysis},
author = {Wenting Jiang and Di Liu and Lilun Geng and Yizhou Long and W T Sun and Yinli Feng and Enliang Huang},
journal = {Machines},
year = {2026},
doi = {10.3390/machines14070815},
url = {https://doi.org/10.3390/machines14070815}
}FAQ
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