Elastic-plastic contact stiffness model of dry gas seal friction interface

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Journal of Vibration and Shock ›› 2023, Vol. 42 ›› Issue (10) : 165-171.

ZHAI Xiao,YANG Xiaocheng,CHEN Jinlin,DING Xuexing

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Abstract

Aiming at the complex and changeable elastoplastic deformation stage of the dry gas seal friction interface, based on the characteristics of the asperities satisfying continuity, smoothness and monotonicity in the whole deformation process, the cosine function was used to explore the relationship between the contact surface deformation and the contact characteristics. Then, based on the statistical theory, the overall contact model of the friction interface is established. Finally, the established model is compared with the GW model, CEB model, ZMC model, KE model. Compared with the five classic models of the LIN model, the mechanical properties and influencing factors of the dry gas seal friction interface are obtained through theoretical analysis and numerical solution. The results show that: the model in this paper realizes the continuity, smoothness and monotonicity of the asperity in all stages of deformation; the contact load, contact area and contact stiffness are positively related to the dimensionless contact deformation; and the average contact distance of the dimensionless surface is negative. Correlation, and the smaller the average contact distance of the dimensionless surface, the greater the proportion of plastic deformation of the rough surface; in order to make the dry gas seal moving ring and static ring operate more reliably and smoothly, the contact surface between the moving ring and the static ring should be guaranteed. Try to be as smooth and flat as possible, so that the average contact distance of the dimensionless surface is controlled below 2.5.

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dry gas seal / contact model / elastic-plastic stage / contact stiffness / statistical theory

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ZHAI Xiao,YANG Xiaocheng,CHEN Jinlin,DING Xuexing . Elastic-plastic contact stiffness model of dry gas seal friction interface[J]. Journal of Vibration and Shock, 2023, 42(10): 165-171

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