Contact Characteristics at Interface in Three-Body Contact Conditions with Rough Surfaces and Foreign Particles

Nanoparticles as lubricant additives under a certain average diameter and concentration may reduce wear, friction scuffing damage. However, atmospheric dust particles affect not only human health but also the efficiency of components, even cause component failures. Therefore, contact characteristics at interfaces with foreign require careful investigation. In this work, 3-body microcontact mechanics concept is used to analyze effects wear debris on real area, mode, asperity deformation type separation interface. The results show that relationship profile between dimensionless area (At*) normal load (Ft*) wedge-shaped in Using surface-to-surface 2-body upper bound surface-to-particle lower bound, hybrid situation bounds. As increases, At* increases gradually well. order mode p-s contact, then s-s contact. If interface decrease hardness third body will increase significantly same Ft*. Conversely, ratio plastic gradually. turning point (TPCA) occurs when within composite equivalent surface RMS roughness about 50–70% for debris. When Ft* slightly larger than Ftpca*, share total approximately equally which help pressure improve performance.