TY - JOUR

T1 - Validation of statistic and deterministic asperity contact models using experimental Stribeck data

AU - Maier, Michael

AU - Pusterhofer, Michael

AU - Summer, Florian

AU - Grün, Florian

N1 - Publisher Copyright: © 2021 The Authors

PY - 2022/1

Y1 - 2022/1

N2 - Contact models are used, among others, to describe the asperity contact in lubricated contacts. In recent decades, a large number of contact models have been developed based on different approaches. In this article a selection of classical statistical contact models are compared with a deterministic FE model. The validation of the different approaches was carried out applying an indirect methodology. By comparing a numerically determined Stribeck curve, on which the characteristics of the contact model has a significant influence, and experimentally determined Stribeck curves, the applicability of the different contact models can be evaluated. The influence of elastic and elastoplastic material behaviour in the deterministic contact model on the asperity contact pressure curves and Stribeck curves, respectively, was examined during the investigations. The results show, that the elastic FEM contact model and the statistical model according to Greenwood and Tripp provide the best agreement with the experimental Stribeck data. This can be attributed to the fact that the roughness peaks are smoothed immediately in the early contact stage and the smoothed surface behaves almost elastically.

AB - Contact models are used, among others, to describe the asperity contact in lubricated contacts. In recent decades, a large number of contact models have been developed based on different approaches. In this article a selection of classical statistical contact models are compared with a deterministic FE model. The validation of the different approaches was carried out applying an indirect methodology. By comparing a numerically determined Stribeck curve, on which the characteristics of the contact model has a significant influence, and experimentally determined Stribeck curves, the applicability of the different contact models can be evaluated. The influence of elastic and elastoplastic material behaviour in the deterministic contact model on the asperity contact pressure curves and Stribeck curves, respectively, was examined during the investigations. The results show, that the elastic FEM contact model and the statistical model according to Greenwood and Tripp provide the best agreement with the experimental Stribeck data. This can be attributed to the fact that the roughness peaks are smoothed immediately in the early contact stage and the smoothed surface behaves almost elastically.

KW - Contact mechanics

KW - Elastohydrodynamic

KW - Finite element method

KW - Mixed friction

UR - http://www.scopus.com/inward/record.url?scp=85118865962&partnerID=8YFLogxK

U2 - 10.1016/j.triboint.2021.107329

DO - 10.1016/j.triboint.2021.107329

M3 - Article

AN - SCOPUS:85118865962

VL - 165.2022

JO - Tribology International

JF - Tribology International

SN - 0301-679X

IS - January

M1 - 107329

ER -