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(Multi-spot contact according to Holm without influence between the N
individual spots)
<math>R_e = \rho/2 x \sum a_i + 3 \pi \rho/32N² 32N^2 x \sum \sum (s_ij) i \neq j</math>
(Multi-spot contact according to Greenwood considering the influence between
the spots)
*'''Path resistance''' cR<sub>d</sub> = R<sub>b</sub> + R<sub>K</sub>
*'''Contact resistance and contact force''' <math>R_K = 280D ³ ^3 E(F · r) K</math>
(According to Holm model for film-free spherical contact surfaces with plastic
deformation of the contact material; F<sub>k</sub> < 1 N for typical contact materials)
