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

Autor: Prabhakar Sathujoda, Angelo Maligno, Aneesh Batchu, Bharath Obalareddy, Roberto Guglielmo Citarella, Giacomo Canale
Jazyk: angličtina
Rok vydání: 2020
Předmět:
Timoshenko beam theory
Materials science
finite element method
02 engineering and technology
lcsh:Technology
Article
Corrosion
law.invention
functionally graded materials
corrosion
rotor-bearing systems
0203 mechanical engineering
law
Finite element method
Functionally graded materials
Rotor-bearing systems
General Materials Science
Composite material
Physics::Chemical Physics
lcsh:Microscopy
lcsh:QC120-168.85
Bearing (mechanical)
lcsh:QH201-278.5
Rotor (electric)
lcsh:T
021001 nanoscience & nanotechnology
Thermal conduction
Temperature gradient
020303 mechanical engineering & transports
lcsh:TA1-2040
lcsh:Descriptive and experimental mechanics
lcsh:Electrical engineering. Electronics. Nuclear engineering
0210 nano-technology
Material properties
lcsh:Engineering (General). Civil engineering (General)
lcsh:TK1-9971
Zdroj: Materials; Volume 13; Issue 20; Pages: 4546
Materials, Vol 13, Iss 4546, p 4546 (2020)
Materials
ISSN: 1996-1944
DOI: 10.3390/ma13204546
Popis: 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.
Databáze: OpenAIRE
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