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Rotational Stiffness Formula for Compression Spring

Rotational Stiffness Formula for Compression Spring

Rotational Stiffness Formula for Compression Spring

(OP)
I have designed a snap beam fastening mechanism which is spring loaded to provide a releasable clamping force between two surfaces but am having trouble calculating the appropriate geometry of the snapping beam due to the strange loading conditions.  Attached is a picture of the mechanism, I am having trouble accounting for the rotational stiffness of the compression spring seeing how it does not act at a finite point.  What is the best way to account for this?  This design has been made and is currently in use, but I have noticed the spring's rotational stiffness is actually a dominate factor.  I'm asking because I'm trying to improve on the mechanism for the next update.  Thanks for your help.

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