Effects of 3D anisotropic heterogeneous subsurface topology on film thickness, pressure, and subsurface stresses in an elasto-hydrodynamically lubricated point contact

Percolation and Supply Behavior of Lubricant on Porous Self‐Lubricating Material

“…According to the Hertz contact mechanics, the maximum contact stress occurs at the subsurface. [33] The calculation results when the mesh size is 0.05, 0.1, and 0.2 mm are consistent with the classical theory. Comparing the stress results of the three finer grid sizes, the calculated value with 0.2 mm grid size is smaller than the other two cases.…”

A review of advances in tribology in 2020–2021

“…However, existing EHL models mostly treat solids as homogeneous materials with three-dimensional isotropics. In order to be able to assess the criticality of specific aspects of microstructure, Zhang et al [856] established the EHL lubrication model of threedimensional anisotropic heterogeneous materials as shown in Fig. 53.…”

“…Fig 53. Schematic representation of (a) an elastohydrodynamically lubricated contact between a sphere and a polycrystalline anisotropic material and (b) comparison between isotropic and anisotropic materials[856]. Reproduced with permission from Ref [856],.…”

Solid viscoelasticity in contact mechanics and elastohydrodynamic lubrication

“…For these classical applications in engineering, the understanding of the physical mechanisms governing the lubrication lm formation and the associated pressure generation has reached a very high level of predictability as a result of extensive theoretical/numerical and experimental research in the last 70 years. Nowadays even the e ect of material heterogeneity and anisotropy of bearing steels on the contact pressure, the contact stresses and the fatigue life in dry and EHL lubricated conditions can be modelled and calculated [153][154][155]. Apart from the above-mentioned elastic hard metals, soft materials such as polymers are increasingly used in modern industry due to a range of outstanding properties in terms of corrosion and chemical-resistance, low cost, less noise generation and light weight.…”

“…Numerically, the solution of an elastic half-space dry contact problem can be obtained by solving the 3D Navier-Cauchy equation such as in Ref. [153,154] or by solving the simpli ed 2D Boussinesq equation with e cient numerical methods such as the discrete convolution fast Fourier transform (DC-FFT) method [88] or the multilevel multi-integration (MLMI) method [141]. Analytical solutions and e cient numerical methods are available for idealized elastic contacts.…”