strains in membranes
strains in membranes
(OP)
Can anyone tell me how to measure mechanical & thermal strains in a 5 micron thick polyimide membrane.
Thanks!
Thanks!
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RE: strains in membranes
May be cross-polarizing?
(pry wont get you quantitative data thou)
RE: strains in membranes
Thanks!
RE: strains in membranes
I really was guessing cause i've heard that those methods will show strains in polymers cause the strain causes the polymer to polarize/phase shift light passing through it.
Try back (transmission) illuminating the membrane w/ polarized light and viewing through a polarizer, then rotate.
I'm not really sure how to look at phase shifts in light though. There must be a way but my optics knowledge runs out.
A quick google search yields:
http://micro.magnet.fsu.edu/primer/techniques/index.html
http://www.google.com/search?hl=en&lr=&ie=UTF-8&oe=UTF-8&q=optical+strain+measurement+polymer+membranes
hope this helps...
nick
RE: strains in membranes
Maybe your material is suitable to have a strain sensitive foil printed on it or you could have a custom strain gage made to insert in place of the current membrane.
Also, here's another link for photostress info:
http://www.vishay.com/test-measurements/photo-stress-plus/