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April 2, 2005

Negative Poisson Ratio — Why you can put a cork back in a wine bottle

Galicia_wine_cork_lg

Most materials, when squeezed at one end, bulge at the other.

Cork distributes the load and when compressed at one end narrows along its length.

That's why you can put it back in the bottle.

Don't believe me?

Try it in the privacy of your own home.

Scientists over the years have experimented with materials with this characteristic, termed a negative Poisson ratio after the French scientist who studied the phenomenon.

Such materials also get thicker when stretched (below).

Poissonfoamneg

The New York Times called one such substance "anti-rubber" when it was described in an article published in Science magazine.

Contrast that with the behavior of most materials such as that below

Poissonfoamnorm

which become thinner when stretched.

Confused?

Read what University of Wisconsin materials scientist Rod Lakes, the creator of "anti-rubber," has to say about the subject on his website.

April 2, 2005 at 09:01 AM | Permalink


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Comments

Hi,

I am interested in experimenting with "antirubber", auxetic rubber/foam rubber, etc. as a means to replace the traditional inflated bladder used to bladder mold tubular composites (bike handlebars, ski poles, etc.). I thought that awhile back I found a commercial source for cylindrical exdruded auxetic rubber. Do you know of any sources where one can buy these materials? Otherwise, I suppose I could just link together a series of wine corks;). Thanks,

Seth Cabe

Posted by: Seth Cabe | Sep 26, 2007 9:28:57 PM

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