Next Article in Journal
Comparison of Properties of the Hybrid and Bilayer MWCNTs—Hydroxyapatite Coatings on Ti Alloy
Previous Article in Journal
Effect of Compaction and Hydraulic Gradient on Subbase Layer Permeability
Open AccessArticle

Analysis of the Surface/Interface Damage Evolution Behavior of a Coating–Substrate System under Heavy-Load Elastohydrodynamic Lubrication

1
College of Engineering, Huazhong Agricultural University, Wuhan 430070, China
2
Key Laboratory of Agricultural Equipment in Mid-Lower Yangtze River, Ministry of Agriculture, Wuhan 430070, China
3
SAIC Volkswagen Automotive Co., Ltd., Shanghai 201805, China
4
State Key Laboratory of Mechanical Transmission, Chongqing University, Chongqing 400044, China
5
Chongqing Yangjiang Machine manufacture Co., Ltd., Chongqing 400000, China
*
Author to whom correspondence should be addressed.
Coatings 2019, 9(10), 642; https://doi.org/10.3390/coatings9100642
Received: 21 August 2019 / Revised: 24 September 2019 / Accepted: 27 September 2019 / Published: 3 October 2019
Keeping a coating–substrate system undamaged during heavy-load elastohydrodynamic lubrication (EHL) conditions is challenging. To overcome this problem, an EHL model with a coated gear pair was built. Firstly, based on the full-system finite element method, the effect of the coating elastic modulus on the oil film pressure was obtained. Secondly, the failure mode was predicted after the stress analysis. Finally, the surface/interface damage evolution behavior of the coating–substrate system was analyzed visually by embedding cohesive zone elements. In the numerical calculation, stiffer coatings tended to increase the film pressure and secondary pressure spike, compared with more compliant coatings. As the coating stiffness decreased, the maximum equivalent stress in the system reduced, and its location tended to develop close to or at the substrate. The coating cracking and interfacial delamination were individually caused by the shear stress in the coating and shear stress on the interface, and both of them initiated in the region of the secondary pressure peak. The interfacial delamination increased the crack failure probability of coating and vice versa. Therefore, through analyzing the EHL model, the exact damage growth location and its evolution in the coated solids can be determined, and the failure mechanism can be comprehensively revealed. View Full-Text
Keywords: coating; gear; elastohydrodynamic lubrication (EHL); cohesive zone model; crack; delamination coating; gear; elastohydrodynamic lubrication (EHL); cohesive zone model; crack; delamination
Show Figures

Figure 1

MDPI and ACS Style

Xiao, Y.; Zou, M.; Shi, W.; Kang, M. Analysis of the Surface/Interface Damage Evolution Behavior of a Coating–Substrate System under Heavy-Load Elastohydrodynamic Lubrication. Coatings 2019, 9, 642.

Show more citation formats Show less citations formats
Note that from the first issue of 2016, MDPI journals use article numbers instead of page numbers. See further details here.

Article Access Map by Country/Region

1
Back to TopTop