Mastodawn

In addition to the right material used for a bicycle helmet its geometric design can improve its shock-absorbing properties. Now, a helmet has been developed using a so-called auxetic structure that can absorb energy more effectively than traditional materials. See http://www.neat-news.com/2025/03/63.php. #bicycle_helmet #auxetic

Neat News 2025

Licho Dec 8

Fun #FACT, in Freedom And Constraint Topologies (F.A.C.T.) a bent blade spring is a topological equivalent to a beam. Beams aren't very #3dprinter friendly, but blades are.

Here's an example: my first idea of construction of an #auxetic #infill that replaces beams with topological equivalents

Elecia White Dec 8, 2023

There was a question about #auxetic #origami that caused me to excitedly search around for a curved-crease example I'd seen demonstrated (by Ekaterina Lukasheva).

I misread the original question but here is the link I found anyway.

https://artscicstra.wordpress.com/2018/02/26/field-notes-math-papers-by-ekaterina-lukasheva/

"Auxetic" means that when you pull horizontally, it gets larger vertically as well. This is also known as having a negative Poisson ratio.

Balloons and taffy are non-auxetic: stretching one way leads to shrinking the other.