Stiffness Model of Joint Surface Based on Coupling of Substrate Deformation and Asperity Interaction

doi:10.3901/JME.2022.09.190

Abstract

Abstract: A new elastoplastic contact stiffness modeling method for the bolt joint surface is proposed for the bolt joint surface. This model not only continues the idea that the asperities have continuous and smooth contact characteristics, but also reveals the coupling relationship between the substrate deformation and the asperity interaction. First, the normal contact model of the joint surface with continuous smooth contact characteristics is established through multi-scale theory and mathematical statistics. Then, a single asperity-substrate system model and a multi-asperity contact model are established to explore the mechanism and coupling relationship between substrate deformation and asperity interaction. Furthermore, the joint surface contact model is revised. Finally, the simulation results are compared with the existing experimental data to verify the correctness of the modified model and analyze the influence of substrate deformation and asperity interaction. The simulation results show that the substrate deformation not only affects the contact deformation of the asperities, but is also the direct cause of the asperity interaction. The asperity interaction makes the height distribution of the asperities deviate, resulting in the lowering of the local height plane of the joint surface. Compared with the substrate deformation, the asperity interaction has a significant influence on the contact stiffness, but the influence of the surface roughness is still dominant.

Key words: joint surface, contact stiffness, substrate deformation, asperity interaction, coupling method

CLC Number:

TG502
O3443

WANG Jingjing, LI Ling, SUN Litai, ZHANG Jinhua, CAI Anjiang. Stiffness Model of Joint Surface Based on Coupling of Substrate Deformation and Asperity Interaction[J]. Journal of Mechanical Engineering, 2022, 58(9): 190-199.

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