Difference between revisions of "Contact Spring Calculations"

From Electrical Contacts
Jump to: navigation, search
m
(→‎Contact Spring Calculations)
Line 1: Line 1:
−
===<!--6.4.7-->Contact Spring Calculations===
+
{|
−
<figure id="fig:Oneside_fixed_contact_bending_spring">
+
|'''Editor''':
−
[[File:One side fixed contact bending spring.jpg|right|thumb|One side fixed contact bending spring]]
+
|DODUCO Holding GmbH<br>
−
</figure>
+
Im Altgefäll 12<br>
−
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:
+
75181 Pforzheim / Germany<br>
−
:$F = \frac{3 \cdot E \cdot J}{L^3} $
+
Phone +49 (0) 7231 602-0<br>
 +
Fax +49 (0) 7231 602-398<br>
 +
Mail: info@doduco.net<br>
 +
|-
 +
|'''Managing Directors''':
 +
|
 +
Dr. Hans-Joachim Dittloff (Vorsitzender)<br>
 +
Dr. Franz Kaspar<br>
 +
Hajo Kufahl<br>
 +
|-
 +
|'''Registration''':
 +
|HRB 710592 AG Mannheim
 +
|-
  
−
where J is the momentum of inertia of the rectangular cross section of the beam
+
|'''Consulting and Realisation''':
−
:$J = \frac{B \cdot D^3}{12}$
+
|Steinbeis - Transferzentrum Unternehmensentwicklung an der Hochschule Pforzheim (SZUE)<br>
−
 
+
Blücherstraße 32 <br>
−
For springs with a circular cross-sectional area the momentum of inertia is
+
75177 Pforzheim <br>
−
:$J=\pi D^4/64$
+
https://www.szue.de/
−
:$D= Durchmesser$
+
|-
−
 
+
|'''Revision and German version''':
−
To avoid plastic deformation of the spring the max bending force σ<sub>max</sub> cannot be exceeded
+
|Christian Teitscheid - Teitscheid Freelance IT<br>
−
:$\sigma_{max} = \frac{3 \cdot E \cdot D}{2L^2}\cdot_{max}$
+
Barbarastraße 22 <br>
−
 
+
47495 Rheinberg <br>
−
The stress limit is defined through the fatigue limit and the 0.2% elongation limit resp.
+
http://www.teitscheid-freelance.de/
−
:$\times_{max} = \frac{2 \cdot L^2}{3 \cdot D \cdot E}R_{p0,2}$
+
|-
−
 
+
|}
−
<br />and/or<br />
 
−
:$F_{max} = \frac{B \cdot D^2}{6L}R_{p0,2}$
 
−
 
 
−
 
 
−
<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]]
 

Revision as of 14:36, 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/

Retrieved from "https://www.electrical-contacts-wiki.com/index.php?title=Contact_Spring_Calculations&oldid=4146"