Electrical Contacts - User contributions [en]

Contact Spring Calculations

2016-12-20T13:27:44Z

STZAdmin:

===Contact Spring Calculations===
<figure id="fig:Oneside_fixed_contact_bending_spring">
[[File:One side fixed contact bending spring.jpg|right|thumb|One side fixed contact bending spring]]
</figure>
The influence of the dimensions can be illustrated best by using the single side fixed beam model <xr id="fig:Oneside_fixed_contact_bending_spring"/>. For small deflections the following equation is valid:
:$F = \frac{3 \cdot E \cdot J}{L^3} $

where J is the momentum of inertia of the rectangular cross section of the beam
:$J = \frac{B \cdot D^3}{12}$

For springs with a circular cross-sectional area the momentum of inertia is
:$J=\pi D^4/64$
:$D= Durchmesser$

To avoid plastic deformation of the spring the max bending force σmax cannot be exceeded
:$\sigma_{max} = \frac{3 \cdot E \cdot D}{2L^2}\cdot_{max}$

The stress limit is defined through the fatigue limit and the 0.2% elongation limit resp.
:$\times_{max} = \frac{2 \cdot L^2}{3 \cdot D \cdot E}R_{p0,2}$

 and/or 
:$F_{max} = \frac{B \cdot D^2}{6L}R_{p0,2}$

<li>'''Special Spring Shapes'''</li>
<ul>
<li>'''Triangular spring'''</li>

Deflection
:$ \times = \frac{F}{2 \cdot E \cdot J}L^3$

:$= \frac{6 \cdot F}{E \cdot B}\cdot \frac{L^3}{D^3}$

Max. bending force
:$\sigma_{max}= \frac{18 \cdot F \cdot L}{B \cdot D^2}$

<li>'''Trapezoidal spring'''</li>

Deflection
:$ \times = \frac{F}{(2 + B_{min} /B_{max})}\times \frac{L^3}{E \cdot J}$

:$\times= \frac{12 \cdot F}{(2 + B_{min} /B_{max})}\cdot \frac{L^3}{E \cdot B \cdot D^3}$

Max. bending force
:$\sigma_{max}= \frac{18 \cdot F \cdot L}{(2 + B_{min} /B_{max}) \cdot B_{max} \cdot D^2 }$
</ul>

==References==
[[Application Tables and Guideline Data for Use of Electrical Contact Design#References|References]]

[[de:Berechnung_von_Kontaktfedern]]

Electrical Contacts:Impressum

2016-06-02T09:21:21Z

STZAdmin:

{|
|'''Editor''':
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Phone +49 (0) 7231 602-0 
Fax +49 (0) 7231 602-398 
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Dr. Franz Kaspar 
Hajo Kufahl 
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|'''Consulting and Realisation''':
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Electrical Contacts:Impressum

2016-06-02T09:20:57Z

STZAdmin:

{|
|'''Editor''':
|DODUCO GmbH 
Im Altgefäll 12 
75181 Pforzheim / Germany 
Phone +49 (0) 7231 602-0 
Fax +49 (0) 7231 602-398 
Mail: info@doduco.net 
|-
|'''Managing Directors''':
|
Dr. Hans-Joachim Dittloff (Vorsitzender) 
Dr. Franz Kaspar 
Hajo Kufahl 
|-
|'''Registration''':
|HRB 504069 AG Mannheim
|-
|'''VAT ID No''':
|DE812097777
|-
|'''Consulting and Realisation''':
|Steinbeis - Transferzentrum Unternehmensentwicklungan der Hochschule Pforzheim (SZUE) 
Blücherstraße 32 
75177 Pforzheim 
https://www.szue.de/
|-
|'''Revision and German version''':
|Christian Teitscheid - Teitscheid Freelance IT 
Barbarastraße 22 
47495 Rheinberg 
http://www.teitscheid-freelance.de/
|-
|}