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How to design a plastic snap

How to design a plastic snap

How to design a plastic snap

How to design this a plastic snap. Does anyone have a parametric model?

RE: How to design a plastic snap


What is a parametric mode?

You need to design a spring element, taking advantage of many plastics' flexibility.


RE: How to design a plastic snap

There's many articles on the web for plastic snap fit design. I'm sure some have equations you could plug into Excel for a parametric study. Not quite sure how yours works.

RE: How to design a plastic snap

....Parametric model, for example

there is nothing about these snap-fit. Are about simple snap-fit

RE: How to design a plastic snap

A snap fit means having the ability to distort enough to fit past an obstacle without permanently damaging the part.

In models that means an FEA to determine factors such as how much contact pressure there is, how much strain there is, and from the strain, determine if the material will break from the resulting stress. There's no formula for any of those.

That picture doesn't look like a good snap fit solution - it appears to require far too much distortion to deflect without breaking.

Take a bunch of things that have snap fits apart and see how they work. You can measure to see the required distortion and measure the force required to produce that distortion to get an idea of the material properties involved.

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