Recent Development in Modeling of Coated Spherical Contact

Abstract

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.

Milling of Complex Surfaces of EN 10060 Steel after HVOF Sprayed NiCrBSi Coatings

“…For the newly presented relation ( 13) of a simple, discrete evaluation of the adhesive stress A dh (based on the input technological parameters), an adequate relation ( 14) (based on the surface morphology) applies [19]. This relation is based on simple mechanics, where it is a suitable/adequate ratio between the surface roughness of the machined substrate R a (µm) and the structural grain size D gr (µm) of the coating.…”

“…Based on the relation (1), own measurement results, analyses and interpretations of obtained measurement results, a parameter characterizing tensile stress σ rz can be introduced, which can be expressed by the relation (19) after modifications [27,28].…”

“…The importance of R a roughness for application calculations is elaborated in great detail in our patent specifications [29,30]. This article deals, for example, with the calculation of adhesion A dh (14), with the applied calculation of roughness R a P = f (R mp , v c , f z , a p ) (10), as well as with the calculation of surface stresses σ rz = f (R a , R a0 , E mat ) (19). Equation (19) declares a new relation to the Vickers hardness HV = f (R a , σ rz ), which has been compared and verified with the literature [29,30], as presented in Section 3.…”

“…The coated spherical contact was of interest also for other researchers [19,20]. There are some models being developed, which allow a thorough understanding of the spherical coated surface under different loading modes.…”

Boundary Element Method for Tangential Contact of a Coated Elastic Half-Space

“…Numerical simulation and calculation of normal contact of coated surfaces has also been extensively studied. This includes modelling the contact of specific body shapes [12], or creating contact models, e.g., using finite element analysis [13,14], to investigate different contact configurations. The complete solution for normal contact (both non-adhesive and adhesive) with coated elastic bodies has been given in [15].…”