Titlebook: Electric Contacts; Theory and Applicati Ragnar Holm Textbook 1967Latest edition Springer-Verlag Berlin Heidelberg 1967 Anode.Graphit.Norm.P

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The load bearing contact area as a function of load and elastic and plastic properties of the memberThe theory of indentation in § I treats the formation of calculable load bearing areas, .., for members with smooth surfaces and cases when .. is a circle or an ellipse, particularly the cases when the members are spheres, including a sphere and a plane, or crossed cylinders.

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Electrodynamic repulsion in a symmetric contact of non-magnetic materialWe simplify the problem by again using the artifact of Fig. (10.02). Electrodynamic forces are active where the lines of current flow have components parallel to the surface ... These mechanical forces are generated by the interaction of the electric current with its own magnetic field. We have already studied this field in § 10.

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The capacitance of a contact. Electrostatic attraction in a contactThe capacitance, ., between two essentially parallel equipotential surfaces both with the area . m. and distant from each other by . m, which may vary from point to point, is, with the relative dielectric permittivity = 1,.where

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The (equilibrium) temperature distribution in the constriction of a contact between two metals with Consider a current carrier that is moved from position (1) to another one (2) whereby the carrier in (1) was on an energy level higher than it meets in (2). To restore equilibrium it has to give off the surplus energy at (2). Thermoelectric effects are such energy transports.

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Temperature distribution in the constriction of a contact between members of very different conductiFor simplicity, we will calculate as if the constriction belonged to a single a-spot whose dimensions, however, do not appear in the formulas. The formulas are generally valid and independent of the shape of the contact surface by virtue of the character of the .-.-relation. Cf. § 13.

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The contact resistance. General theorywledge by forming the definitions on a broader basis, and it is felt that a typical example may illustrate their content without limiting the range of vision. Since thermoelectric forces are irrelevant for the concepts, we neglect them in the first instance and take them into consideration later. Se