Effect of Corrosion on the Natural and Whirl Frequencies of a Functionally Graded Rotor-Bearing System Subjected to Thermal Gradients

Corrosion causes a loss of material resulting in the reduction of mass and stiffness of a component, which consequently affects the dynamic characteristics of any system. Fundamental frequency analysis of a corroded functionally graded (FG) rotor system, using the finite element method based on the...

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Bibliographic Details
Published in:Materials 2020-10, Vol.13 (20), p.4546
Main Authors: Sathujoda, Prabhakar, Obalareddy, Bharath, Batchu, Aneesh, Canale, Giacomo, Maligno, Angelo, Citarella, Roberto
Format: Article
Language:English
Subjects:
Beam theory (structures)
Ceramics
Composite materials
Conduction heating
Conductive heat transfer
Corrosion
Corrosion effects
Dynamic characteristics
Finite element analysis
Finite element method
Fourier law
Fractures
Frequency analysis
Functionally gradient materials
Heat conductivity
Material properties
Resonant frequencies
Rotor-bearing systems
Stiffness
Temperature
Temperature distribution
Temperature gradients
Thermal simulation
Timoshenko beams
Vibration analysis
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Summary:Corrosion causes a loss of material resulting in the reduction of mass and stiffness of a component, which consequently affects the dynamic characteristics of any system. Fundamental frequency analysis of a corroded functionally graded (FG) rotor system, using the finite element method based on the Timoshenko beam theory, was investigated in the present paper. The functionally graded shaft consisting of an inner metallic core and an outer ceramic layer was considered with the radial gradation of material properties based on the power law. Nonlinear temperature distribution (NLTD) based on the Fourier law of heat conduction was used to simulate the thermal gradient through the cross-section of the FG rotor. The finite element formulation for a functionally graded shaft with a corrosion defect was developed and the dynamic characteristics were investigated, which is the novelty of the present work. The corrosion parameters such as length, depth and position of the corrosion defect in the shaft were varied and a parametric study was performed to investigate changes in the natural and whirl frequencies. An analysis was carried out for different power indexes and temperature gradients of the functionally graded shaft. The effects of corrosion were analysed and important conclusions are drawn from the investigations.
ISSN:1996-1944
1996-1944
DOI:10.3390/ma13204546