New Fractal Contact Model Considered Multi-scale Levels

doi:10.3901/JME.2019.09.080

Abstract

Abstract: A new elastic-plastic model for contact of rough surfaces is presented. The model based on the traditional contact theory of Hertz and the presented fractal contact models is developed. Research the regularity of the contact condition of micro-bulge, considered on the multi contact asperity in different fractal parameters in the first detail. Then, to modify the contact areas by considering the multi-scale levels and a new way use to calculate the distribution function. The model developed evaluates that the multi-scale parameter will influence the values of critical contact parameters, the deformation of contact area will be the conditions of elastic, elastic-plastic and plastic successively and the effect factor has relationship with G and D. Besides, by considering the effect factor and using new distribution function, the new model gains the more precise results than the model of GW and MB. It is show that the predict values from present model is fitting closer than the values from MB model and GW model to the results of Bhushan' experimental observation. The comparison results strongly indicate that the new model is more reasonable in describing the contact behavior between rough surfaces.

Key words: asperity, contact model, elastic-plastic, multi-scale levels, rough surfaces

CLC Number:

TH117

YUN Ruide, DING Bei. New Fractal Contact Model Considered Multi-scale Levels[J]. Journal of Mechanical Engineering, 2019, 55(9): 80-89.

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