A Thermal Elastoplastic Fractal Surface Contact Modelling Approach and Its Application in Combined Rotors
Ya-Zheng Zhao a, Jin Zhou b, Yang Zhou a, Yong-Hui Wang c and Yuan-Ping Xu d
aDoctorate student, College of Mechanical and Electrical Engineering, Nanjing University of Aeronautics and Astronautics, Nanjing 210016, China
bProfessor, College of Mechanical and Electrical Engineering, Nanjing University of Aeronautics and Astronautics, Nanjing 210016, China
cGraduate Student, College of Mechanical and Electrical Engineering, Nanjing University of Aeronautics and Astronautics, Nanjing 210016, China
dAssociate Professor, College of Mechanical and Electrical Engineering, Nanjing University of Aeronautics and Astronautics, Nanjing 210016, China
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Abstract:
A thermal elastoplastic fractal contact stiffness model is presented to investigate the impact of temperature on interface stiffness characteristics and combined rotor vibration. The normal total load and contact stiffness of the asperities and the bolt are derived under temperature conditions, using fractal geometry theory. A thermal elastoplastic rotor dynamic model, which considers surface contact, is proposed by utilizing the Lagrange equation and the equivalent spring energy change between the contact interfaces. Numerical analysis demonstrates that the contact stiffness exhibits nonlinearity with the increase of temperature difference, resulting in a significant increase in the total normal stiffness. Additionally, the impact of interface thermal stiffness on the rotor dynamic characteristics of each order is different.
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