## 1 Introduction  
Bearings are machine components that support rotating machine elements, especially axles, and wheels. Elements in rotating contact such as balls, cylindrical, or taper rollers, for example, transmit the main load instead of the sliding contact present in other types of sliding bearings [1]. Its application is extensive in industrial machinery of the most varied segments, moreover, speed multipliers operating in hydraulic and wind turbines, and speed reduction boxes located in automobile engines. Bearings are responsible for 76% of premature problems in turbine gearboxes [2; 3]. Generally, turbine runtime is expected by design for about 20 to 30 years. However, mostly 20% of the turbine's nominal life-bearing failures are recorded. The defects are related to axial shear failure due to heavy and dynamic loads, vibrations, lack of lubrication, and sudden temperature changes [4; 5]. The failure of the main bearing in the motor shaft causes significant production loss in wind turbines, automotive and electrical equipment, and auxiliary devices [2]. In offshore wind turbines designed for a life of more than 20 years, operation and maintenance costs account for 20% to 25% of total revenues. Also, the failure of one element can generate losses in others. So, in effect, a USD 5000 bearing failure in a wind turbine can cost a USD 250,000 project, which will involve cranes, a service crew, gearbox replacements, generator rewinding, and downtime and loss of power generation, which also represent increased cost loss [6; 7; 8]. Experimental studies have been developed to investigate the causes of wind turbine gearbox bearing failures evaluating inclusions found at damaged sites by tomography [9; 10; 11; 12]. Other studies [13; 14; 15; 16; 17; 18; 19; 20; 21; 22] focused on the causes of bearing failures through analytical, numerical, and experimental methodologies, which analyze in more detail the wear and its causes in the rolling motion, taking into account the surface roughness and the presence of lubrication on the parts in contact. According to [PERSON] [13] lubrication effectively reduces friction and heat losses and extends the life of the parts in contact. [PERSON] et al. [14] and [PERSON] [15] the importance of evaluating the interaction effects between friction, lubrication, wear, roughness, plastic deformation, contact pressure, oxidation, changes in geometry at contact, and crystallographic reorientation. [PERSON] et al. [16] pointed out the connection between lubricating film thickness and friction of a uniform surface texture along with the transition from hydrodynamic (EHD) to mixed lubrication in non-compliant contacts. [PERSON] et al. [17] investigated the impact of surface flattening on the friction coefficient using the mixed lubrication model at the microscale with the finite element software Abaqus. [PERSON] [18] presented a model of lubrication in all regimes applied to thrust bearings and wet clutches for analyzing surface roughness influence in contact mechanics when surfaces are boundary lubricated, as well as hydrodynamic film formation. [PERSON] and [PERSON] [19] evaluated the durability behavior of lubricated sliding contacts using a combined experimental (Ring-on-Disc) and computational model (journal-bearing geometry) to predict the tribological system destabilization. [PERSON] et al. [20] investigated the influence of smooth and rough surfaces on friction in an elastohydrodynamic contact (transition of EHD to mixed lubricated), using a ball-on-disc tribometer. They measured a range of slide-roll ratios (SRR) at different speeds with two oils of quite different viscosities, enabling experiments to be conducted over a wide range of lambda values, defined as the ratio between the film thickness and root-mean-square roughness of the surfaces (RMS). [PERSON] and [PERSON] [21] analyzed wear through a variation of the microscale abrasion test adopting the elastohydrodynamic lubrication regime (EHL) and elliptical contact geometric characteristics. [PERSON] and [PERSON] et al.