Contact Physics – Formulas - Revision history

Doduco Redaktion: Replaced content with "{| |'''Editor''': |DODUCO Holding GmbH
Im Altgefäll 12
75181 Pforzheim / Germany
Phone +49 (0) 7231 602-0
Fax +49 (0) 7231 602-398
Mail: inf..."

2019-02-07T10:37:33Z

Replaced content with "{| |'''Editor''': |DODUCO Holding GmbH Im Altgefäll 12 75181 Pforzheim / Germany Phone +49 (0) 7231 602-0 Fax +49 (0) 7231 602-398 Mail: inf..."

Doduco Redaktion at 10:33, 7 February 2019

2019-02-07T10:33:07Z

Doduco Redaktion: Reverted edits by Doduco Redaktion (talk) to last revision by Teitscheid

2018-08-10T11:30:15Z

Reverted edits by Doduco Redaktion (talk) to last revision by Teitscheid

Doduco Redaktion at 13:16, 25 January 2017

2017-01-25T13:16:01Z

Teitscheid at 15:58, 25 September 2014

2014-09-25T15:58:57Z

Teitscheid at 16:28, 21 September 2014

2014-09-21T16:28:14Z

Doduco Redaktion: /* 6.4.2 Contact Physics – Formulas */

2014-05-19T12:01:01Z

‎6.4.2 Contact Physics – Formulas

Doduco Admin at 16:26, 6 May 2014

2014-05-06T16:26:26Z

Doduco Admin at 11:39, 1 April 2014

2014-04-01T11:39:32Z

Doduco Admin at 11:35, 1 April 2014

2014-04-01T11:35:41Z

@@ Line 1: / Line 1: @@
-===<!--6.4.2-->Contact Physics – Formulas===
+{|
-*'''Constriction resistance'''
+Pforzheim / Germany<br>
-*'''Contact resistance'''
+Phone +49 (0) 7231 602-0<br>
-*'''Path resistance'''
+Fax +49 (0) 7231 602-398<br>
-: <math>R_d = R_b + R_K</math>
-*'''Contact resistance and contact force'''
+Mail: info@doduco.net<br>

@@ Line 2: / Line 2: @@
 *'''Constriction resistance'''
-: $R_e = \rho/2a$
+: <math>R_e = \rho/2a</math>
 (Single spot contact according to Holm; circular touching spot between clean
 contact surfaces)
-: $R_e = \rho/2Na$
+: <math>R_e = \rho/2Na</math>
 (Multi-spot contact according to Holm without influence between the N
 individual spots)
-: $R_e = \rho/2 x \sum a_i + 3 \pi \rho /32N^2 x \sum \sum (s_ij) i \neq j$
+: <math>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 between
 the spots)
 *'''Contact resistance'''
-: $R_K = R_e + R_f$
+: <math>R_K = R_e + R_f</math>
 *'''Path resistance'''
-: $R_d = R_b + R_K$
+: <math>R_d = R_b + R_K</math>
 *'''Contact resistance and contact force'''
-: $R_K = 280\rho \sqrt[3]{E (F_K \cdot r)} $
+: <math>R_K = 280\rho \sqrt[3]{E (F_K \cdot r)} </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)
-: $R_K = 9000 \rho \sqrt{ H/ F_K}$
+: <math>R_K = 9000 \rho \sqrt{ H/ F_K}</math>
 (According to Holm model for film-free spherical contact surfaces with plastic
 deformation 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)
-: $F_A \approx 0,8 xl^2$
+: <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 max. contact temperature'''
-: $T_kmax \approx 3200 U_K$
+: <math>T_kmax \approx 3200 U_K</math>
 *'''Contact resistance at higher contact forces (according to Babikow)'''
-: $R_K = cF_k^{-m}$
+: <math>R_K = cF_k^{-m}</math>
 For F<sub>K</sub> between 10 and 200 N<br/>
 c = material dependent proportionality factor<br/>

@@ Line 1: / Line 1: @@
-{|
+===<!--6.4.2-->Contact Physics – Formulas===
-|'''Editor''':
-|DODUCO Holding GmbH<br>
+*'''Constriction resistance'''
-Im Altgefäll 12<br>
+: $R_e = \rho/2a$
-Pforzheim / Germany<br>
+(Single spot contact according to Holm; circular touching spot between clean
-Phone +49 (0) 7231 602-0<br>
+contact surfaces)
-Fax +49 (0) 7231 602-398<br>
+: $R_e = \rho/2Na$
-Mail: info@doduco.net<br>
+(Multi-spot contact according to Holm without influence between the N
 |-
-|'''Managing Directors''':
+!Material combination
+!c
 |-
-|'''Registration''':
+|Copper - Copper
-|HRB 710592 AG Mannheim
+|(0.08 bis 0.14) x 10<sup>-3</sup>
 |-
-|'''Consulting and Realisation''':
+|Aluminum - Aluminum
-|Steinbeis - Transferzentrum Unternehmensentwicklung an der Hochschule Pforzheim (SZUE)<br>
+|(3 bis 6,7) x 10<sup>-3</sup>
 |-
-|'''Revision and German version''':
+|Brass - Brass
-|Christian Teitscheid - Teitscheid Freelance IT<br>
+|0.67 x 10<sup>-3</sup>
 |-
 |}

@@ Line 1: / Line 1: @@
-===<!--6.4.2-->Contact Physics – Formulas===
+{|
+|'''Editor''':
-*'''Constriction resistance'''
+|DODUCO Holding GmbH<br>
-: $R_e = \rho/2a$
+Im Altgefäll 12<br>
-(Single spot contact according to Holm; circular touching spot between clean
+Pforzheim / Germany<br>
-contact surfaces)
+Phone +49 (0) 7231 602-0<br>
-: $R_e = \rho/2Na$
+Fax +49 (0) 7231 602-398<br>
-(Multi-spot contact according to Holm without influence between the N
+Mail: info@doduco.net<br>
 |-
-!Material combination
+|'''Managing Directors''':
-!c
 |-
-|Copper - Copper
+|'''Registration''':
-|(0.08 bis 0.14) x 10<sup>-3</sup>
+|HRB 710592 AG Mannheim
 |-
-|Aluminum - Aluminum
+|'''Consulting and Realisation''':
-|(3 bis 6,7) x 10<sup>-3</sup>
+|Steinbeis - Transferzentrum Unternehmensentwicklung an der Hochschule Pforzheim (SZUE)<br>
 |-
-|Brass - Brass
+|'''Revision and German version''':
-|0.67 x 10<sup>-3</sup>
+|Christian Teitscheid - Teitscheid Freelance IT<br>
 |-
 |}

@@ Line 2: / Line 2: @@
 *'''Constriction resistance'''
-: <math>R_e = \rho/2a</math>
+: $R_e = \rho/2a$
 (Single spot contact according to Holm; circular touching spot between clean
 contact surfaces)
-: <math>R_e = \rho/2Na</math>
+: $R_e = \rho/2Na$
 (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 /32N^2 x \sum \sum (s_ij) i \neq j</math>
+: $R_e = \rho/2 x \sum a_i + 3 \pi \rho /32N^2 x \sum \sum (s_ij) i \neq j$
 (Multi-spot contact according to Greenwood considering the influence between
 the spots)
 *'''Contact resistance'''
-: <math>R_K = R_e + R_f</math>
+: $R_K = R_e + R_f$
 *'''Path resistance'''
-: <math>R_d = R_b + R_K</math>
+: $R_d = R_b + R_K$
 *'''Contact resistance and contact force'''
-: <math>R_K = 280\rho \sqrt[3]{E (F_K \cdot r)} </math>
+: $R_K = 280\rho \sqrt[3]{E (F_K \cdot r)} $
 (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)
-: <math>R_K = 9000 \rho \sqrt{ H/ F_K}</math>
+: $R_K = 9000 \rho \sqrt{ H/ F_K}$
 (According to Holm model for film-free spherical contact surfaces with plastic
 deformation 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>
+: $F_A \approx 0,8 xl^2$
 (Rule of thumb with F<sub>A</sub> in N and l in kA)
 *'''Contact voltage and max. contact temperature'''
-: <math>T_kmax \approx 3200 U_K</math>
+: $T_kmax \approx 3200 U_K$
 *'''Contact resistance at higher contact forces (according to Babikow)'''
-: <math>R_K = cF_k^{-m}</math>
+: $R_K = cF_k^{-m}$
 For F<sub>K</sub> between 10 and 200 N<br/>
 c = material dependent proportionality factor<br/>
@@ Line 92: / Line 92: @@
 [[Application Tables and Guideline Data for Use of Electrical Contact Design#References|References]]
-[[de:Formeln_aus_derKontaktphysik]]
+[[de:Formeln_aus_der_Kontaktphysik]]

@@ Line 40: / Line 40: @@
-{| class="twocolortable scalable" style="text-align: left; font-size: 12px; width:45%; float: left;max-height:298px; margin-right:2%;"
+{| class="twocolortable scalable" style="text-align: left; font-size: 12px; width:45%;"
 |-
 !Material combination
@@ Line 64: / Line 64: @@
 |}
-{| class="twocolortable scalable" style="text-align: left; font-size: 12px; width:45%;min-height:298px; "
+{| class="twocolortable scalable" style="text-align: left; font-size: 12px; width:45%; "
 |-
 !Contact shapes