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How can I determine spring rate of U-shaped clip?

  1. Jun 26, 2015 #1
    I'm redesigning a small, U-shaped spring clip, similar in shape to this:


    To make it fit, I had to increase the radii in the corners from the original design, so I need to validate that it will still have sufficient spring rate/clamp force for our application. I'm trying to figure out how I can do this analytically. It seems like a simple problem, but I can't find anything in my machine design book about U-shaped clips. At the very least, if I know the spring behavior of the original clip, can I predict how increasing the radii will affect it?
  2. jcsd
  3. Jun 26, 2015 #2


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    Gold Member

    Go to a Mechanics of Materials text and look up Castigliano's method and related energy methods. You are likely to find a related example there.
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