Investigation of Contact Stiffness Model for Joint Surfaces Based on Domain Expansion Factor and Asperity Interaction

doi:10.3901/JME.2018.19.088

Abstract

Abstract: The dynamic characteristics of mechanical equipment can be directly affected by the contact stiffness of joint surfaces. In order to establish a more accurate model of contact stiffness, the elastic deformation characteristics of a single asperity subjected to local load are obtained based on the fractal geometry theory. The distribution function of micro contact truncated area is introduced from the domain extension factor. The fractal model of contact stiffness considering the influence of surface asperity interaction is derived. Also, the surface profile data of the experimental samples are obtained by three-dimensional non-contact measurement to verify the accuracy of the proposed model. According to the structure function method, the surface fractal parameters of each sample are calculated, and then the theoretical contact stiffness and the experimental results are compared and analyzed. It is concluded that the growth rate of normal contact stiffness is related to the critical contact area of rough surface, and the critical contact area determines the proportion of elastic deformation in the joint. After considering the interaction of asperities, the predicted curve of the proposed model is more in line with the relationship between experimental normal load and contact stiffness.

Key words: asperity interaction, contact stiffness, fractal theory, joint surface

CLC Number:

TH117

WANG Runqiong, ZHU Lida, ZHU Chunxia. Investigation of Contact Stiffness Model for Joint Surfaces Based on Domain Expansion Factor and Asperity Interaction[J]. Journal of Mechanical Engineering, 2018, 54(19): 88-95.

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