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Creep Coefficients for Teflon (for FEA Analysis)
2

Creep Coefficients for Teflon (for FEA Analysis)

Creep Coefficients for Teflon (for FEA Analysis)

(OP)
I'm trying to perform a FEA analysis on Teflon as a valve seal. Can someone provide general creep coefficients for either Ansys or Cosmos?

RE: Creep Coefficients for Teflon (for FEA Analysis)

I have no values but in general PTFE is a soft material and I expect high creep. Probably not a great choice for a seal. Filled PTFE should have much lower creep though.

RE: Creep Coefficients for Teflon (for FEA Analysis)

One small comment. Be careful when looking for data on "Teflon". DuPont uses that tradename for 3 or 4 totally different polymers. You probably need data for PFTE.

RE: Creep Coefficients for Teflon (for FEA Analysis)

(OP)
Thanks Demon3 for all your help!

RE: Creep Coefficients for Teflon (for FEA Analysis)

We aim to please sir smile

RE: Creep Coefficients for Teflon (for FEA Analysis)

(OP)
Thanks Plastx...Great Stuff!

RE: Creep Coefficients for Teflon (for FEA Analysis)

g1a1,

be careful with using some of those 'published' values; as Demon3 indicated in his first response they may not all refer to the same thing. What's to stop you from actaully getting your seal tested? I know there's lots of great labs out there (e.g. Axel) that would be happy to do a creep test (short term or long term) on a (Teflon) seal!

RE: Creep Coefficients for Teflon (for FEA Analysis)

I did some rough "memory" tests on square profile PTFE lengths we use as seals. At temperature (100`C+), these seals were clamped up in a circle overnight, they retained the new shape reasonably well.
Don't know if you need to take this into account??

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