accelerated fatigue of polymer films

[Roham]

Hi,

Does anyone have any information on accelerated fatigue testings of thin polymer films? References are appreciated.

Thanks a lot,

Roham.

[Jorgen]

As you know, accelerated fatigue testing for plastics can be quite difficult to perform rigorously. Typically it involves increasing the temperature and/or load magnitude. Both of which are difficult to correlate with the original conditions. I don't have any references directly available :(

- Jorgen

[Roham]

Thanks for the note,

That's my biggest concern right now since I'm not sure how well I can correlate the results when I increase temperature/load. I probably have to construct a failure function that takes into account temperature as well as stress (here strain cause I think strain-controlled fatigue is more appropriate for polymer films that undergo plastic deformation). Stress-rupture behavior of the material makes it even more complicated, I probably need to somehow include that in the denominator of the failure function (strain/strain_to_failure). I'm just hoping that at high temperature and stresse material fails with the same failure mode. I appreciate any ideas/thoughts on that. Regards,

Roham.

[Jorgen]

My only comment is that a careful test program can help you validate your accelerated fatigue testing program.

- Jorgen