Contact behaviors of a power-law hardening elastic–plastic asperity with soft coating flattened by a rigid flat

Zhao, Bin; Lu, Xin; Ma, Xuefei; Shi, Xiujiang; Dong, Qingbing

doi:10.1016/j.ijmecsci.2019.01.013

Cited by 19 publications

(4 citation statements)

References 23 publications

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“…[32] analyzed the elastic indentation of a coated half-space and reported that soft coatings, unlike hard coatings, weaken the yield resistance of a coated system in the range of moderate coating thicknesses. A similar finding was also reported by Zhao et al [33] for the elasticplastic flattening of a coated sphere. However, the yield resistance behavior for ultra-thin coatings was not addressed in [32,33].…”

Section: Physical Meaning Lowest Yield Resistancesupporting

confidence: 90%

“…A similar finding was also reported by Zhao et al [33] for the elasticplastic flattening of a coated sphere. However, the yield resistance behavior for ultra-thin coatings was not addressed in [32,33]. Goltsberg et al [34] analyzed the flattening case of soft coatings and found that the yield resistance vs. the coating thickness for the whole range of coating thicknesses is a mirror image of that for hard coatings shown in Figure 3.…”

Section: Physical Meaning Lowest Yield Resistancesupporting

confidence: 90%

“…As mentioned earlier, the literature on coated spherical contact with soft coatings is relatively sparse. Zhao et al [33] investigated such a problem for one loading cycle, where both coating and substrate materials are elastic-plastic with power-law hardening. For fixed substrate material properties, at a given interference, the contact area increases significantly with decreasing hardening exponent of the coating material but is negligibly affected by coating thickness or other coating material properties.…”

Section: Elastic-plastic Regimementioning

confidence: 99%

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Recent Development in Modeling of Coated Spherical Contact

Zhou

Etsion

2020

Materials

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Since a coated rough surface can be modeled as a collection of many spherical coated asperities, in order to understand the coated rough surface contact, it is required to first model a single coated spherical contact. This review paper presents a comprehensive summary of the coated spherical contact modeling and its experimental validation that was done mostly by the authors’ group at the Technion and published in the relevant literature. The coated spherical contact is considered under two loading modes, namely pure normal loading and combined normal and tangential loading. Based on the normally loaded spherical contact results, a coated rough surface contact modeling is presented. In addition, experimental results that show an interesting correlation with the coated spherical modeling are briefly discussed. Finally, some limited work on the bilayer/multilayer coated spherical contact is introduced.

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Section: Physical Meaning Lowest Yield Resistancesupporting

confidence: 90%

Section: Physical Meaning Lowest Yield Resistancesupporting

confidence: 90%

Section: Elastic-plastic Regimementioning

confidence: 99%

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Recent Development in Modeling of Coated Spherical Contact

Zhou

Etsion

2020

Materials

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“…The material properties would be adopted as the crankshaft-bearing system in the marine engine. The crankshaft and steel back materials of the bearing are both steel materials, which could be set as the 2% linear hardening elastic-plastic material [26], while the coating (the commonly used babbitt metal SnSb11Cu6) could be set as the power-law hardening elastic-plastic materials [27]. The geometrical and material parameters are set as follows: The radius of the two asperities, R ; the coating thickness, t , of Asperity 2; the interaction, δ , between the two sliding asperities; the horizontal coordinate, w h , of Asperity 1; the Young’s modulus, E 1 , the yield strength, Y 1 , and the Poisson’s ratios, ν 1 , of Asperity 1; the Young’s modulus, E co , the yield strength, Y co , the hardening exponent, n , and the Poisson’s ratios, ν co , of the coating of Asperity 2; and the Young’s modulus, E su , the yield strength, Y su , and the Poisson’s ratios, ν su , of the substrate of Asperity 2.…”

Section: Finite Element Modelmentioning

confidence: 99%

Sliding Interaction for Coated Asperity with Power-Law Hardening Elastic-Plastic Coatings

Zhao

2019

Materials

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Sliding between asperities occurs inevitably in the friction pair, which affects the efficiency and reliability in both lubricated and non-lubricated conditions. In this work, the contact parameters in the coated asperity sliding process are studied, and the universal expressions of the average contact force and the friction coefficient are obtained. The effect of the interference between asperities, the material and geometrical parameters including the Young’s modulus ratio and yield strength ratio of the coating and substrate, and the hardening exponent and thickness of the coating on the average contact forces and friction coefficient is considered. It shows both normal and tangential contact forces increase with the increasing interference, increasing Young’s modulus ratio, decreasing yield strength ratio, and decreasing coating thickness; while the trend is different for the effect of the hardening exponent of the coating. The normal force increases and the tangential force decreases as the hardening exponent increases. Based on this, the influence of these parameters on the effective friction coefficient is obtained further. It reveals that the friction coefficient increases as the interference and Young’s modulus ratio enlarge and decreases as the yield strength ratio, the coating’s hardening exponent, and thickness increase. The universal expressions for the contact force and friction coefficient in the sliding process are obtained. This work might give some useful results to help choose the optimum coatings for specific substrates to reduce friction in cases where the asperity contact exists, especially in the focused field of the journal bearing in the marine engine under poor lubrication conditions.

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