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Solid, stress-strain module
Posted Jan 6, 2010, 12:45 p.m. EST 2 Replies
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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 Jan 6, 2010, 5:11 p.m. EST
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Posted:
1 decade 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
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Posted:
1 decade 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.