Difference between revisions of "Contact Spring Calculations"

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(→‎Contact Spring Calculations)
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===<!--6.4.7-->Contact Spring Calculations===
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{|
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<figure id="fig:Oneside_fixed_contact_bending_spring">
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|'''Editor''':
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[[File:One side fixed contact bending spring.jpg|right|thumb|One side fixed contact bending spring]]
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|DODUCO Holding GmbH<br>
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</figure>
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Im Altgefäll 12<br>
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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"/><!--(Fig. 6.20)-->. For small deflections the following equation is valid:
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75181 Pforzheim / Germany<br>
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:$F = \frac{3 \cdot E \cdot J}{L^3} $
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Phone +49 (0) 7231 602-0<br>
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Fax +49 (0) 7231 602-398<br>
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Mail: info@doduco.net<br>
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|-
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|'''Managing Directors''':
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|
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Dr. Hans-Joachim Dittloff (Vorsitzender)<br>
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Dr. Franz Kaspar<br>
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Hajo Kufahl<br>
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|-
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|'''Registration''':
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|HRB 710592 AG Mannheim
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|-
  
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where J is the momentum of inertia of the rectangular cross section of the beam
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|'''Consulting and Realisation''':
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:$J = \frac{B \cdot D^3}{12}$
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|Steinbeis - Transferzentrum Unternehmensentwicklung an der Hochschule Pforzheim (SZUE)<br>
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Blücherstraße 32 <br>
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For springs with a circular cross-sectional area the momentum of inertia is
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75177 Pforzheim <br>
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:$J=\pi D^4/64$
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https://www.szue.de/
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:$D= Durchmesser$
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|-
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|'''Revision and German version''':
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To avoid plastic deformation of the spring the max bending force σ<sub>max</sub> cannot be exceeded
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|Christian Teitscheid - Teitscheid Freelance IT<br>
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:$\sigma_{max} = \frac{3 \cdot E \cdot D}{2L^2}\cdot_{max}$
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Barbarastraße 22 <br>
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47495 Rheinberg <br>
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The stress limit is defined through the fatigue limit and the 0.2% elongation limit resp.
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http://www.teitscheid-freelance.de/
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:$\times_{max} = \frac{2 \cdot L^2}{3 \cdot D \cdot E}R_{p0,2}$
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|}
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<br />and/or<br />
 
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:$F_{max} = \frac{B \cdot D^2}{6L}R_{p0,2}$
 
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<li>'''Special Spring Shapes'''</li>
 
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<ul>
 
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<li>'''Triangular spring'''</li>
 
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Deflection
 
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:$ \times = \frac{F}{2 \cdot E \cdot J}L^3$
 
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:$= \frac{6 \cdot F}{E \cdot B}\cdot \frac{L^3}{D^3}$
 
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Max. bending force
 
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:$\sigma_{max}= \frac{18 \cdot F \cdot L}{B \cdot D^2}$
 
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<li>'''Trapezoidal spring'''</li>
 
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Deflection
 
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:$ \times = \frac{F}{(2 + B_{min} /B_{max})}\times \frac{L^3}{E \cdot J}$
 
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:$\times= \frac{12 \cdot F}{(2 + B_{min} /B_{max})}\cdot \frac{L^3}{E \cdot B \cdot D^3}$
 
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Max. bending force
 
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:$\sigma_{max}= \frac{18 \cdot F \cdot L}{(2 + B_{min} /B_{max}) \cdot B_{max} \cdot D^2 }$
 
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</ul>
 
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==References==
 
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[[Application Tables and Guideline Data for Use of Electrical Contact Design#References|References]]
 
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[[de:Berechnung_von_Kontaktfedern]]
 

Revision as of 15:36, 27 January 2017

Editor: DODUCO Holding 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 710592 AG Mannheim
Consulting and Realisation: Steinbeis - Transferzentrum Unternehmensentwicklung an 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/

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