balidey
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| posted on 7/11/11 at 09:32 AM |
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mechanical properties of a sponge - whats it called
Help, its been too long since my Uni days to remember.
You know when you get a sponge, pull it in one direction it shrinks in the other?
I'm sure this property has a certain name, but I can't remember and I can't find it online.
Anyone know?
Dutch bears have terrible skin due to their clogged paws
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mcerd1
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| posted on 7/11/11 at 09:35 AM |
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http://en.wikipedia.org/wiki/Poisson's_ratio
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balidey
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| posted on 7/11/11 at 09:38 AM |
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Yes, thats it, thank you.
Dutch bears have terrible skin due to their clogged paws
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britishtrident
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| posted on 7/11/11 at 10:50 AM |
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The interesting bit is when you try and put anything under tension in all 3 axis --- ie: tri-axial stress system
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BenB
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| posted on 7/11/11 at 11:34 AM |
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Sponginess 
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richardlee237
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| posted on 7/11/11 at 11:46 AM |
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Poissons ratio
The ratio of the volume of chips to fish
Used for assessing chip shops frequented by nerdy french speaking engineers  
Quote Lord Kelvin
“Large increases in cost with questionable increases in performance can be tolerated only in race horses and women.”
Quote Richard Lee
"and cars"
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richardlee237
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| posted on 7/11/11 at 11:48 AM |
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also
Tri axial stress defined as
Wife, Mother and Outlaw
Quote Lord Kelvin
“Large increases in cost with questionable increases in performance can be tolerated only in race horses and women.”
Quote Richard Lee
"and cars"
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balidey
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| posted on 7/11/11 at 11:55 AM |
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yes yes, all very good answers.
I felt like such a muppet this morning trying to explain to someone why when you pull an item (sponge was first thing I thought of as my lecturer used
it to demonstrate the principle) it gets narrower.
So I remembered the sponge, but forgot the actual name of the principle.... good to see my University education wasn't wasted.
[Edited on 7/11/11 by balidey]
Dutch bears have terrible skin due to their clogged paws
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Stott
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| posted on 7/11/11 at 12:13 PM |
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quote:
Originally posted by balidey
yes yes, all very good answers.
I felt like such a muppet this morning trying to explain to someone why when you pull an item (sponge was first thing I thought of as my lecturer used
it to demonstrate the principle) it gets narrower.
[Edited on 7/11/11 by balidey]
Then the Mrs said "very nice, now put that thing away and sod off to work"
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twybrow
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| posted on 7/11/11 at 12:25 PM |
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Now look for materiasl that when you pull them, they get fatter - ie a 've Poissons ratio... Very weird.
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