Talk:Auxetics

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Contents 1 Re: image issue 2 image issue 3 Possible vandalism alert 4 New fabric with auxetic structure like a bungee cord

[edit] Re: image issue

The image is a bit confusing, the stretching should be drawn perpendicular to how it is at the moment, then the hexagon becomes squarer as it is stretched, and therefore wider. I'll do a better series of drawings once my exams are done.

? I have to say, if the the image has any relationship to the article, I can't tell what it is. Why is it here? What is it trying to illustrate? Geoffrey.landis (talk) 16:13, 6 December 2007 (UTC)

[edit] image issue

The article states: "Auxetics are materials that become thicker in their perpendicular directions when stretched." The image shows the opposite, an object being stretched which has become thinner in the perpendicular direction.

J. Crocker 18:41, 1 August 2006 (UTC)

[edit] Possible vandalism alert

Slashdot recently linked to an article that prominently linked to this page on Wikipedia so keep your eye out for vandals. --froth^{T C} 07:43, 4 January 2007 (UTC)

And once again --Agamus 08:44, 6 December 2007

[edit] New fabric with auxetic structure like a bungee cord

[[1]] Zetix is built around the principle of auxetics: objects that actually get fatter the more you stretch them....

To demonstrate how Zetix works, the best thing is to look how a thread behaves. When you jump from a bridge using a bungee cord, the force of gravity acting over your body weight will stretch it as you go down in free fall. While this happens, the cord threads will stretch getting closer together and making the cord get thinner as it expands through a larger distance.

However, if you coil a line around the bungee cord, something that defies logic will happen: the whole structure will get wider as it stretches. As you can see in the image, the line around the bungee cord becomes taut, making the bungee itself flex outward. This principle is called helical-auxetics. When you put two of these threads together, you have what Reed Richards would call an auxetic structure.Larry R. Holmgren (talk) 08:27, 7 December 2007 (UTC)