Development of the Paris-Erdogan model for the quantitative evaluation of the wear resistance of materials under dynamic contact with a discrete liquid-drop flow

The known fatigue model of Paris-Erdogan was first used for conditions of multi-cycle water-drop impacts with a metallic surface. The model is supplemented by the structure-dependent characteristics of the material. Experimental data providing correctness of model application is presented. The applied problem of quantitative evaluation of the material durability in the conditions of the droplet impact and comparison of materials of different structural classes was solved in the work without costly bench tests

Development of the Paris-Erdogan model for the quantitative evaluation of the wear resistance of materials under dynamic contact with a discrete liquid-drop flow

The known fatigue model of Paris-Erdogan was first used for conditions of multi-cycle water-drop impacts with a metallic surface. The model is supplemented by the structure-dependent characteristics of the material. Experimental data providing correctness of model application is presented. The applied problem of quantitative evaluation of the material durability in the conditions of the droplet impact and comparison of materials of different structural classes was solved in the work without costly bench tests

Tribology properties of hybrid graphene oxide materials as lubricant additives

Graphene oxide was synthesized by the modified Hammers method. With managed hydrolysis in isopropanol solution obtained hybrid material “graphene oxide - copper oxide nanoparticles”. The phase composition of the hybrid material was studied by X-ray phase analysis and UV-visible spectroscopy. By ultrasonic processing dispersions of synthesized materials in glycerol were produced. The concentration of lubricating additives in the lube oil was 0.05 wt. %. The tribological properties of dispersions were investigated using a pin-on-disc friction machine. Tests showed that in the presence of graphene oxide, the friction coefficient was ~0.02, while with the addition of a hybrid material, the coefficient of friction was ~0.035. This is due to various mechanisms of lubrication. Reduction of the coefficient of friction in the presence of graphene oxide is associated with the formation of tribocarbon on the porosity of frictional contacts. While the addition of a hybrid material containing the CuO nanoparticles leads to the formation of a third body

Tribology properties of hybrid graphene oxide materials as lubricant additives

Graphene oxide was synthesized by the modified Hammers method. With managed hydrolysis in isopropanol solution obtained hybrid material “graphene oxide - copper oxide nanoparticles”. The phase composition of the hybrid material was studied by X-ray phase analysis and UV-visible spectroscopy. By ultrasonic processing dispersions of synthesized materials in glycerol were produced. The concentration of lubricating additives in the lube oil was 0.05 wt. %. The tribological properties of dispersions were investigated using a pin-on-disc friction machine. Tests showed that in the presence of graphene oxide, the friction coefficient was ~0.02, while with the addition of a hybrid material, the coefficient of friction was ~0.035. This is due to various mechanisms of lubrication. Reduction of the coefficient of friction in the presence of graphene oxide is associated with the formation of tribocarbon on the porosity of frictional contacts. While the addition of a hybrid material containing the CuO nanoparticles leads to the formation of a third body