... viscosities for u e  = 0.02 m/s, p H  = 0.8 GPa are presented in Fig. 9 . It can be observed that the area with high pressure for η 0  = 0.05 Pa·s is significantly greater than the other two cases. As is shown in Fig. 8 , this is because more asperities come into contact when ambient viscosity η 0...

...Zhiqian Wang; Xingna Liu This paper studies elastic–plastic contact between Greenwood–Williamson (GW) rough surfaces, on which there are many asperities with the same radius whose height obeys the Gaussian distribution. A new plasticity index is defined as the ratio of the standard deviation...

... and asperity contact force, respectively h , h 0 = nominal film thickness and initial film thickness, respectively H  =  h / σ h ¯ t = average gap height f ( δ ) = probability density function of integrated roughness I...

... mechanisms Characterization Asperities Cavitation erosion is a sensitive issue for many components of hydraulic systems exposed to the action of high flow fluids and of vibrating components that are immersed in fluids. In order to increase the durability of hydraulic components, efforts have been...

...; published online May 14, 2018. Assoc. Editor: Stephen Boedo. 21 11 2017 13 04 2018 Piston rings Sliding Surface properties Surface roughness Wear Characterization Asperities The piston ring/cylinder bore tribosystem is of utmost importance for engine performance...

.... A numerical approach was developed on the basis of stochastic solution of mixed lubrication, which combined the Patir and Cheng's average flow model for calculation of the hydrodynamic pressure and the Kogut and Etsion's (KE) rough surface contact model for calculation of the asperity contact pressure...

...-related features of the contact interface. In particular, the break-free force distribution function of the Jenkins elements could be expressed in terms of height distribution of surface asperities. The model considered the contribution of elastically, elasto-plastically as well as plastically deformed...

... , for the dry contact [ 12 ]. When the surfaces slide/roll at a low speed or surface asperities penetrate the lubricant film, the solids are in direct contact with each other, which may mathematically result in a nonpositive film thickness H ≤ 0 according to Eq. (7) , and the pressure flow term...

.... , 2013 , “ The Effect of Multi-Scale Laser Textured Surface on Lubrication Regime ,” Appl. Surf. Sci. , 270 , pp. 58 – 63 . 10.1016/j.apsusc.2012.12.068 [7] Siripuram , R. B. , and Stephens , L. S. , 2004 , “ Effects of Deterministic Asperity Geometry on Hydrodynamic Lubrication...

... Abrasion Coatings Friction Surface properties Surface roughness Surface treatments Wear Wear mechanisms Characterization Asperities As cemented carbide, YT15 with high red-hardness and wear resistance is primarily used for cutting various kinds of steels, which accounts for ∼50% of total...

... cavitation area due to surface roughness, which results in significant increment of asperity contacts, friction, and flash temperature. Besides, the effect of entrainment angle on film thickness will be weakened if the two surfaces operate under starved lubrication condition. Furthermore, the results show...

... studied the lateral contact (shoulder–shoulder contact) between upper and lower asperities in the elastic and elastic-perfectly plastic stages, which is neglected by other classical models. The normal force can be divided into a normal component and a tangential component when two asperities...

...Yuechang Wang; Ying Liu; Gaolong Zhang; Yuming Wang The simulated rough surface with desired parameters is widely used as an input for the numerical simulation of tribological behavior such as the asperity contact, lubrication, and wear. In this study, a simulation method for generating non...

... 2017 Seals Surface roughness Wear Asperities A typical magnetorheological fluid (MRF) is a colloidal suspension which contains scattered magnetic particles in liquid with low magnetic permeability. When no magnetic field is applied, the liquid can be easily changed its form according...

... systems Asperities Polymers are most versatile materials for abundant applications like biomedical, aerospace, automotive, electronics, packaging, and many more. Along with mechanical, thermal, electrical, and optical properties, tribological properties play a crucial role while serving a variety...

... fatigue, whereas abrasive part is an anticipatory outcome of plastic contacts by hard metal asperities on to soft polymer surface. Further, presuming adhesive interactions in elastic–plastic contacts, asperity contact theories with necessary modifications were analyzed to assess load and separation...

... February 1, 2017; final manuscript received April 27, 2017; published online August 2, 2017. Assoc. Editor: James R. Barber. 01 02 2017 27 04 2017 Friction Interface Sliding Surface roughness Viscosity Asperities After the introduction of the concepts of multiscale...

... . Manuscript received December 26, 2016; final manuscript received April 27, 2017; published online July 21, 2017. Assoc. Editor: James R. Barber. 26 12 2016 27 04 2017 Adhesion Contact area Surface roughness Asperities Adhesion between elastic rough bodies is still not well...

..., 2017; published online July 21, 2017. Assoc. Editor: Stephen Boedo. 17 11 2016 11 05 2017 Hydrodynamic lubrication Micro-tribology Surface roughness Asperities The pressure that is generated due to the relative motion of two surfaces in close proximity when...

.... 21( c ) ) at higher applied normal load. The fretting wear mechanism of magnesium alloys at low and high applied normal load are described by the following phenomenon: at low loads, adhesion and deformation of asperities, formation of oxides, abrasion of surfaces are dominating wear mechanisms while...