Fractal Model for Normal Contact Damping of Joint Surface Considering Elastoplastic Phase

doi:10.3901/JME.2019.16.058

Abstract

Abstract: When modeling the normal contact damping of the joint surface, it is incomplete to consider only the elastic energy of the asperity in the perfectly elastic deformation phase and the loss energy in the fully plastic deformation phase, because there is the elastic-plastic deformation phase. The normal contact load of the contacting asperity in the elastoplastic deformation phase is "separated" into the elastic contact load and the plastic contact load, and the elastic and loss energy of the contacting asperity are obtained. The normal contact dynamic model of the joint surface is equivalent to spring and viscous damper, and the analytic model of damping loss factor and normal contact damping of the joint surface is established, and the dimensionless processing is carried out. The results reveal that fractal dimension D and fractal roughness G^* are the important parameters affecting the damping loss factor and the normal contact damping coefficient. When the plastic index ϕ is constant and D is less than the inflection point value (D=1.56), the normal contact damping coefficient increases with the increase of; when D exceeds the inflection point value, it decreases with the increase of G^*. When G^* remains unchanged and D is less than 1.66, the greater the plastic index, the smaller the normal contact damping coefficient; when D is greater than 1.66, the change of the normal contact damping coefficient with ϕ is very small. The accuracy and reliability of the model are verified by the results of experimental modal analysis on line rail sliding table.

Key words: damping loss factor, elastic-plastic contact model, fractal theory, line rail sliding table, normal contact damping

CLC Number:

TH113

CHEN Yonghui, ZHANG Xueliang, WEN Shuhua, LAN Guosheng. Fractal Model for Normal Contact Damping of Joint Surface Considering Elastoplastic Phase[J]. Journal of Mechanical Engineering, 2019, 55(16): 58-68.

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