# Contact Area

When two objects touch, a certain portion of their surface areas will be in contact with each other. Contact area is the fraction of this area that consists of the atoms of one object in contact with the atoms of the other object. Because objects are never perfectly flat due to asperities, the actual contact area (on a microscopic scale) is usually much less than the contact area apparent on a macroscopic scale. Contact area may depend on the normal force between the two objects due to deformation.

The contact area depends on the geometry of the contacting bodies, the load, and the material properties. The contact area between two parallel cylinders is a narrow rectangle. Two, non-parallel cylinders have an elliptical contact area, unless the cylinders are crossed at 90 degrees, in which case they have a circular contact area. Two spheres also have a circular contact area.

Read more about Contact Area:  Friction and Contact Area, Methods For Determining Contact Area

### Other articles related to "contact area, area, contact":

Methods For Determining Contact Area
... One way of determining the actual contact area is to determine it indirectly through a physical process that depends on contact area ... For example, the resistance of a wire is dependent on the cross-sectional area, so one may find the contact area of a metal by measuring the current that flows through that area (through the surface of an ...
Contact Mechanics - Adhesive Contact Between Elastic Bodies - Johnson-Kendall-Roberts (JKR) Model of Elastic Contact
... To incorporate the effect of adhesion in Hertzian contact, Johnson, Kendall, and Roberts formulated the JKR theory of adhesive contact using a balance between the stored elastic ... The JKR model considers the effect of contact pressure and adhesion only inside the area of contact ... solution for the pressure distribution in the contact area in the JKR model is Note that in the original Hertz theory, the term containing was ...
Contact Mechanics - Adhesive Contact Between Elastic Bodies - Derjaguin-Muller-Toporov (DMT) Model of Elastic Contact
... (DMT) model is an alternative model for adhesive contact which assumes that the contact profile remains the same as in Hertzian contact but with additional attractive interactions outside the area of contact ... The area of contact between two spheres from DMT theory is and the pull-off force is When the pull-off force is achieved the contact area becomes zero and there is no ...
Contact Mechanics - History
... Classical contact mechanics is most notably associated with Heinrich Hertz ... In 1882, Hertz solved the contact problem of two elastic bodies with curved surfaces ... This still-relevant classical solution provides a foundation for modern problems in contact mechanics ...
Stripping (chemistry) - Variables
... flow channeling that would reduce the contact area between the liquid and vapor streams ... redistribute the liquid flow evenly to reestablish a higher contact area ... Trays and packing are used to increase the contact area over which mass transfer can occur as mass transfer theory dictates ...

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