spring clip analysis

[dgowans]

While I'm not a newbie when it comes to FEA, I've not done much beyond some rather simple linear statics. I'm now in the process of designing a clip made from spring-tempered stainless steel.

Aside from the obvious step of obtaining accurate material data, what are some things I need to be aware of while running this analysis? At this point I'm just trying to verify that the clip will open enough to be able to engage with its mating component. I'm thinking that this analysis will be non-linear from a displacement standpoint, if not for other reasons.

Apologies in advance if I've over simplified. Then again, that's why I'm making use of this forum!!!!

Thanks,
Dave Gowans

 

[israelkk]

DESIGN HANDBOOK Engineering Guide To Spring Design 1987 Edition, Associated Spring - Barnes Group Inc. Chapter 10 - Retaing rings, Pages 66-70. It gives the design procedure for C-Shape retaning ring springs loaded at the gap or across the diameter.

 

[rb1957]

dgowans,

i really liked your post, 'cause it shows you've thought about the problem !

i think the post above will help you design the clip, but if you want to persue the FEA, i think a simple linear model will answer the question asked (the internal stresses for an enforced opening) and this might also answer the next question (how much force is required to install the clip ?) and presumably you've always been in the elastic range then i think you'd be able to answer your third question (how much force will the clip apply (resist) from the mating part ?) ... tho' this looks a bit trickier (there is an enforced displacement on the ends of the clip (but less than the installation opening) but this is accompanied (reacted) by a pressure on the mating part).

Assuming that your stresses are always elastic, then the linear model should be ok. i think that's the property of spring steel that makes it suitable for clips.

good luck

 

[Drej]

I think linear materials would be ok, but you'd need to consider non-linear geometry as you've mentioned to obtain accurate reactions on the clip. Similarly, whether or not you could get away with linear contact is another matter, which you may need to account for depending on the application of this clip.


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