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Effect of Interlayer on the Elastic-Plastic Deformation of Coating Systems

Published online by Cambridge University Press:  03 January 2019

Y. X. Guo  and
Y. W. Zhao
Y. X. Guo
Affiliation:
College of Mechanical Engineering Jiangnan University Wuxi, China Department of Industrial and Systems Engineering University of Tennessee Knoxville, USA
Y. W. Zhao*
Affiliation:
Jiangnan University Wuxi, China
*
*Corresponding author ([email protected])
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Abstract

The finite element method (FEM) was used to study the elastic-plastic contact in the coating systems with interlayer. The results reveal that with the increase of interlayer thickness, the maximum shear stress of coating/interlayer and interlayer/substrate interfaces decreases. Moreover, the sharply changed shear stress between the interfaces of coating/interlayer and interlayer/substrate decreases too. There is no further decrease when interlayer thickness increase to 0.04 mm and above. With the increasing of interlayer elastic modulus, the shear stress of coating/interlayer interface decreases while the shear stress of interlayer/substrate interface increases. Meanwhile, the higher elastic modulus leads to the intensive tensile stress concentration on the interface of coating/interlayer. Hence, the interlayer with appropriate elastic modulus not only reduces the shear stress of coating/interlayer and interlayer/substrate interfaces but also decreases the tensile stress of coating/interlayer interface. The mechanical properties of coating systems were investigated with different interlayer yield strength. The effective hardness and elastic modulus increase with the increase of interlayer yield strength, which is good to protect the substrate from the deformation. In addition, higher indentation load can lead to the decrease of effective hardness and elastic modulus.

Keywords

InterlayerShear stressTensile stressYield strength
Type
Research Article
Information
Journal of Mechanics , Volume 35 , Issue 3 , June 2019 , pp. 373 - 380
Copyright
© The Society of Theoretical and Applied Mechanics 2018 

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