Fatigue failure of components made from Delrin (Ertacetal)
Fatigue failure of components made from Delrin (Ertacetal)
(OP)
Hi,
I have a component made from Delrin (Ertacetal) which has failed; I suspect the failure is due to fatigue driven by vibration. I've looked at the failed surface under a low magnification microscope and there appears to be what looks like "beach marks"; as the material is white plastic these look a bit like flakes of cod! They are quite large and visible to the naked eye with a pitch of approximately 1 mm. Does fatigue failure of this type of material exhibit "beach marks" similar to metal?
Thanks
I have a component made from Delrin (Ertacetal) which has failed; I suspect the failure is due to fatigue driven by vibration. I've looked at the failed surface under a low magnification microscope and there appears to be what looks like "beach marks"; as the material is white plastic these look a bit like flakes of cod! They are quite large and visible to the naked eye with a pitch of approximately 1 mm. Does fatigue failure of this type of material exhibit "beach marks" similar to metal?
Thanks





RE: Fatigue failure of components made from Delrin (Ertacetal)
RE: Fatigue failure of components made from Delrin (Ertacetal)
The part is axisymmetric, turned from bar material - it is essentially a tube with a flange on the end. The failure has occurred between the flange and tube.
RE: Fatigue failure of components made from Delrin (Ertacetal)
http://www.imrtest.com/cms/repository/media/Articl...
RE: Fatigue failure of components made from Delrin (Ertacetal)
RE: Fatigue failure of components made from Delrin (Ertacetal)
RE: Fatigue failure of components made from Delrin (Ertacetal)