Coulomb friction model with unilateral contact is a basic, but reliable, to represent the resistance sliding between solid bodies. It nowadays well-known that this can be formulated as second–order cone complementarity problem, or equivalently, variational inequality. In article, enriched take into account rolling, also known rolling friction. Introducing cone, an extended Coulomb's and its dua...

This paper deals with the modeling of rolling resistance and analysis effect pavement texture. The Rolling Resistance Model (RRM) is a simplification no-slip rate Dynamic Friction (DFM) based on tire/road contact intended to predict tire/pavement friction at all slip rates. experimental validation this approach was performed using machine simulating tires road surfaces. tested surfaces have wid...

Starting from the well-known fact that the rolling movement always has a lower friction compared to sliding friction, the authors have conceived and realized a pivoting movement joint on a "layer of balls" with "compensation space", placed between the acetabular cup and the femoral head. This technical solution allows free self-directed migration of the balls, depending on the resistance oppose...

This paper presents evolutionary optimization of explicit approximations of the empirical Colebrook’s equation that is used for the calculation of the turbulent friction factor (λ), i.e., for the calculation of turbulent hydraulic resistance in hydraulically smooth and rough pipes including the transient zone between them. The empirical Colebrook’s equation relates the unknown flow friction fac...

Frictional vibration and noise caused by water-lubricated rubber stern tube bearings, which are generated under extreme conditions, severely threaten underwater vehicles' survivability and concealment performance. This study investigates the effect of flaky and spherical MoS2 nanoparticles on tribological properties and damping capacity of water-lubricated rubber materials, with the aim of decr...

The Friction Stir Welding process is now 20 years old and the interest in it and its potential continues to increase dramatically. FSW can be applied to a multitude of products with varying material types and thicknesses. However, a continuous weld is not always required to meet the product performance requirements. Thus, one can consider some form of intermittent weld, such as Friction Stir Sp...

In land system science (LSS), the globalisation of use is often understood via trade flows. Fewer studies have explored power asymmetries and local resistance that shape global connections. Consequently, calls for a deeper engagement with agency been made within LSS. To accommodate this, we engage ethnographic literature on encounters, emphasising concepts friction. These capture ways actors po...

Resin materials are widely used in industrial applications due to their light weight and other desirable characteristics. However, although there resin with self-lubricating functions, problems abrasion chemical resistance. This study focused on urushi, which has long been as a coating for armor protective layers. Since previous studies have shown that urushi exhibits high wear resistance, this...