Discussion Closed This discussion was created more than 6 months ago and has been closed. To start a new discussion with a link back to this one, click here.
Solid, stress-strain module
Posted 6 janv. 2010, 12:45 UTC−5 2 Replies
Please login with a confirmed email address before reporting spam
I am trying to estimate sagging for a membrane. The model is solved by COMSOL except at Poisson's ratio of 0.5, why??
2 Replies Last Post 6 janv. 2010, 17:11 UTC−5
Please login with a confirmed email address before reporting spam
Posted:
2 decades ago
Hi
Well if you ask yourself what the poisson coefficient does, I expect that you will see the reason why.
It gives the ratio, between the inline and out of plane deformations for a given linear strain.
Basically nu=0 would give a metrials behaving somewhat like a liquid, while nu=0.5 would be incompressible. your model will probably still solve for nu=0.495.
Well too simplified what I'm stating here but still not too far
Take a read of the doc from the structural chapter, you will find further clues there
Ivar
Well if you ask yourself what the poisson coefficient does, I expect that you will see the reason why.
It gives the ratio, between the inline and out of plane deformations for a given linear strain.
Basically nu=0 would give a metrials behaving somewhat like a liquid, while nu=0.5 would be incompressible. your model will probably still solve for nu=0.495.
Well too simplified what I'm stating here but still not too far
Take a read of the doc from the structural chapter, you will find further clues there
Ivar
Please login with a confirmed email address before reporting spam
Posted:
2 decades ago
Thanks Ivar.
That was pretty lazy and stupid of me asking the question without bothering to read the basics of structural mechanics.
The material I am using is PDMS [(poly)dimethylsiloxane] for which nu=0.5; but I used nu=0.49, similar to what you suggested to get a fair idea of the sagging.
That was pretty lazy and stupid of me asking the question without bothering to read the basics of structural mechanics.
The material I am using is PDMS [(poly)dimethylsiloxane] for which nu=0.5; but I used nu=0.49, similar to what you suggested to get a fair idea of the sagging.