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  2. Contact mechanics - Wikipedia

    en.wikipedia.org/wiki/Contact_mechanics

    Analytical solution methods for non-adhesive contact problem can be classified into two types based on the geometry of the area of contact. [22] A conforming contact is one in which the two bodies touch at multiple points before any deformation takes place (i.e., they just "fit together").

  3. Contact area - Wikipedia

    en.wikipedia.org/wiki/Contact_area

    Contact area may depend on the normal force between the two objects due to deformation. [1] The contact area depends on the geometry of the contacting bodies, the load, and the material properties. The contact area between the two parallel cylinders is a narrow rectangle. Two, non-parallel cylinders have an elliptical contact area, unless the ...

  4. Bearing pressure - Wikipedia

    en.wikipedia.org/wiki/Bearing_pressure

    Bearing pressure is a particular case of contact mechanics often occurring in cases where a convex surface (male cylinder or sphere) contacts a concave surface (female cylinder or sphere: bore or hemispherical cup). Excessive contact pressure can lead to a typical bearing failure such as a plastic deformation similar to peening.

  5. Thermal contact conductance - Wikipedia

    en.wikipedia.org/wiki/Thermal_contact_conductance

    When the two bodies come in contact, surface deformation may occur on both bodies. This deformation may either be plastic or elastic, depending on the material properties and the contact pressure. When a surface undergoes plastic deformation, contact resistance is lowered, since the deformation causes the actual contact area to increase [8] [9]

  6. Normal contact stiffness - Wikipedia

    en.wikipedia.org/wiki/Normal_contact_stiffness

    Normal contact stiffness is a physical quantity related to the generalized force displacement behavior of rough surfaces in contact with a rigid body or a second similar rough surface. [ 1 ] [ 2 ] Specifically it is the amount of force per unit displacement required to compress an elastic object in the contact region.

  7. Frictional contact mechanics - Wikipedia

    en.wikipedia.org/wiki/Frictional_contact_mechanics

    Classical results for a true frictional contact problem concern the papers by F.W. Carter (1926) and H. Fromm (1927). They independently presented the creep versus creep force relation for a cylinder on a plane or for two cylinders in steady rolling contact using Coulomb’s dry friction law (see below). [5]

  8. Hagen–Poiseuille equation - Wikipedia

    en.wikipedia.org/wiki/Hagen–Poiseuille_equation

    From the equation above, we need to know the area of contact and the velocity gradient. Think of the lamina as a ring of radius r, thickness dr, and length Δx. The area of contact between the lamina and the faster one is simply the surface area of the cylinder: A = 2πr Δx. We don't know the exact form for the velocity of the liquid within ...

  9. Derjaguin approximation - Wikipedia

    en.wikipedia.org/wiki/Derjaguin_approximation

    Derjaguin approximation related the force between two spheres (top) and the interaction energy between two plates (bottom). The Derjaguin approximation (or sometimes also referred to as the proximity approximation), named after the Russian scientist Boris Derjaguin, expresses the force profile acting between finite size bodies in terms of the force profile between two planar semi-infinite ...