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Contact Physics – Formulas

1,605 bytes removed, 12:37, 7 February 2019
Replaced content with "{| |'''Editor''': |DODUCO Holding GmbH<br> Im Altgefäll 12<br> 75181 Pforzheim / Germany<br> Phone +49 (0) 7231 602-0<br> Fax +49 (0) 7231 602-398<br> Mail: inf..."
{| |'''Editor''':|DODUCO Holding GmbH<mathbr>\int\limits_a^x f(\frac{\alpha}{2}\,)\,dx Im Altgefäll 12</mathbr>
===6.4.2 Contact Physics – Formulas===75181 Pforzheim / Germany<br>
*'''Constriction resistance''' : <math>R_e = \rho/2a</math>Phone +49 (Single spot contact according to Holm; circular touching spot between cleancontact surfaces0): <math>R_e = \rho/2Na</math>(Multi7231 602-spot contact according to Holm without influence between the Nindividual spots): 0<mathbr>R_e = \rho/2 x \sum a_i + 3 \pi \rho /32N^2 x \sum \sum (s_ij) i \neq j</math>(Multi-spot contact according to Greenwood considering the influence betweenthe spots)
*'''Contact resistance''': <math>R_K = R_e Fax + R_f49 (0) 7231 602-398</mathbr>
*'''Path resistance''' Mail: <math>R_d = R_b + R_K</math> *'''Contact resistance and contact force''': <math>R_K = 280\rho \sqrt[3]{E (F_K \cdot r)} </math> (According to Holm model for film-free spherical contact surfaces with plasticdeformation of the contact material; F<sub>k</sub> < 1 N for typical contact materials): <math>R_K = 9000 \rho \sqrt{ H/ F_K}</math>(According to Holm model for film-free spherical contact surfaces with plasticdeformation of the contact material; F<sub>k</sub> > 5 N for typical contact materials) *'''Dynamic contact separation''' (without considering magnetic fields caused by the current path) : <math>F_A \approx 0,8 xl^2</math>(Rule of thumb with F<sub>A</sub> in N and l in kA) *'''Contact voltage and maxinfo@doduco. contact temperature''': <math>T_kmax \approx 3200 U_K</math> *'''Contact resistance at higher contact forces (according to Babikow)''' : <math>R_K = cF_k^{-m}</math>For F<sub>K</sub> between 10 and 200 N<br/>c = material dependent proportionality factornet<br/>m = shape dependent exponent of the contact force ==References==[[Application Tables and Guideline Data for Use of Electrical Contact Design#References|References]]
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