On the possibility of complete rough surface of asperities crumpling for an elastoplastic body

To predict the thermal state of precision instruments constructions, it is necessary to take into account the structure of roughness of the contacting surfaces. A necessity of using the multilevel roughness models, including the fractal ones, in modeling the thermal contact of rough bodies made of metallic materials, remained questionable. If higher level roughness elements are not completely smoothed under the pressure, they can influence the contact process. To test this possibility, in the present study we use the finite element software ANSYS and solve two model problems of elastoplastic deformation of the pyramids, as objects similar to asperities. It is shown, that rough elements on asperities surfaces do not disappear even with substantial deforming of the asperities on which they are located. The reasons for this are the form of asperities and material hardening, while a consequence is reducing the real contact area.

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