Symmetrization of contact stresses in coating under frictional sliding indentation

Abstract

Frictional contact problem of a layer-substrate structure is an important topic in coating optimization design. The present work carries out a comprehensive analysis on the coupling effect of coefficient of friction, Poisson’s ratio, and layer thickness on contact stresses distribution. A physical property namely full decoupling under interaction between material and geometric couplings is explicitly observed. Eccentricity in contact could be virtually diminished, and symmetrization on contact pressure of non-Hertzian type is presented at a specific Poisson’s ratio. Additionally, position of tensile peak within in-plane surface stress could not be affected by friction under the full decoupling effect.

HIGHLIGHTS

1. Coupling effects of Poisson’s ratio, friction coefficient, and layer thickness on eccentric contact involving soft bonded coating are studied systematically.

2. A physical property namely full normal-tangential decoupling at a specific Poisson’s ratio in thin coating is explicitly observed and analyzed comprehensively.

3. The tensile peak of in-plane stress as a crack initiator at the coating surface is studied under the full decoupling effect mentioned above.

Keywords:

• Frictional sliding contact
• coating
• reversal effect
• normal-tangential decoupling

Acknowledgement

KJ also thanks Profs. İsa Çömez and Ivan Argatov for their kind help and interesting discussions.

Declaration of interests

The authors declare that they have no known competing financial interests or personal relationships that could have appeared to influence the work reported in this paper.

Additional information

Funding

This work is supported by National Science Foundation of China (Grant Nos. 11932004 and 51875059). The authors would like to acknowledge the support from Chongqing City Science and Technology Program (Grant No. cstc2020jcyj-msxmX0850), and Youth Foundation of Education Bureau of Guizhou Province (Grant No. QJH-KY-Z[2022]018).