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Tribology Letters

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01-12-2018 | Original Paper

Theoretical and Finite Element Analysis of Static Friction Between Multi-Scale Rough Surfaces

Authors: Xianzhang Wang, Yang Xu, Robert L. Jackson

Published in: Tribology Letters | Issue 4/2018

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Abstract

The current work considers the multi-scale nature of roughness in a new model that predicts the static friction coefficient. This work is based upon a previous rough surface contact model, which used stacked elastic–plastic 3-D sinusoids to model the asperities at multiple scales of roughness. A deterministic model of a three-dimensional deformable rough surface pressed against a rigid flat surface is also carried out using the finite element method (FEM). The accuracy of the deterministic FEM model is also considered. At the beginning of contact, which is surface-point contact, the asperities or peaks are isolated, sharp, and the contact areas consist of an inadequate number of elements and sources of error. In this range of contact, the results are not presented as real or accurate. As the normal load increases, the number of the contact elements become larger, and thus, the results become more accurate. That is, the deterministic FEM results are most accurate at high loads. Spectral interpolation is used to smooth the geometry in between the original measured nodes. The effects of normal load and plasticity index on static friction are then analyzed. The results predicted by the theoretical model are also compared to other existing rough surface friction contact models and the FEM results. They are in a good qualitative agreement, especially for higher loads and higher plasticity indices. The FEM model also has significant error, but it is more accurate at higher loads where the proposed multi-scale static friction model and FEM model are in better agreement.

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Title: Theoretical and Finite Element Analysis of Static Friction Between Multi-Scale Rough Surfaces
Authors: Xianzhang Wang
Yang Xu
Robert L. Jackson
Publication date: 01-12-2018
Publisher: Springer US
Published in: Tribology Letters / Issue 4/2018
Print ISSN: 1023-8883
Electronic ISSN: 1573-2711
DOI: https://doi.org/10.1007/s11249-018-1099-6

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