The combined elastic response of two contacting isotropic bodies: . It includes compliance of both bodies.
The elastic contact of smooth nonadhesive bodies with locally quadratic surfaces. For a sphere on a flat surface, the load is proportional to the reduced elastic modulus, square root of sphere radius and indentation to the three-halves power.
A dimensionless measure comparing adhesive interaction range with elastic deformation in sphere contact. Small values favour the DMT contact approximation, while large values favour the JKR limit.
An adhesive sphere-on-flat contact approximation combining Hertzian contact deformation with an attractive force outside the contact area. It is most appropriate for sufficiently stiff, small-radius contacts with a small Tabor parameter; a fitted reduced modulus is not automatically the sample Young's modulus.
Attraction between different contacting surfaces. Adhesion can be described by interfacial work per area, while a measured pull-off force additionally depends on geometry and the elastic response.
Unwanted sticking that prevents intended relative motion. In surface micromachining, a receding liquid meniscus can pull a compliant released beam onto the substrate; adhesion can then keep it there. Avoiding a liquid-vapor drying interface addresses one route to stiction, but does not remove contact adhesion during use.
The tensile force magnitude needed to detach contacting surfaces during retraction. A force-probe measurement reads it from the force minimum relative to the noncontact baseline; roughness, capillary forces and contact geometry affect its interpretation.
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Contact mechanics is a field of study in engineering and materials science that deals with the interaction of solid bodies in contact with each other. It focuses on understanding the forces, deformations, and frictional behavior that occur at the interface of two or more bodies when they come into contact. This involves examining how materials deform under load, how forces are transmitted through the contact area, and how various factors such as surface roughness and material properties influence the contact behavior.