What are the principles (The Four Tribosystems)
of surface engineering applied to wear phenomena?

  • Smooth solids sliding on other smooth solids.

  • Harder (usually sharper) substances sliding
    on softer surfaces.

  • Fatigue of surfaces by repeated stressing (which is
    usually compressive.

  • Fluids with or without suspended solids in motion
    with respect to a solid surface. (Corrosion is frequently
    a contributor