This episode covers a fascinating class of materials called auxetics. Experience tells us that when we pull a material in tension, it should shrink; auxetics do the opposite. By shifting, winding, or rotating, these materials get wider when stretched and thinner when compressed.
Articles Discussed:

Lakes R. Foam structures with a negative Poisson's ratio. [LINK]
2004 Evans, Auxetic polymers: a new range of materials [LINK]
2016 Saxena et al Three Decades of Auxetics Research − Materials with Negative Poisson's Ratio: A Review [LINK]
2006 Grima and Evans, Auxetic behavior from rotating triangles [LINK]
2007 Alderson and Alderson, Auxetic materials [LINK]
2016 Konaković and coworkers, Beyond developable: computational design and fabrication with auxetic materials. [LINK]

This episode is sponsored by Matmatch. Check out how they can help you find the perfect material for your next engineering project! This episode is also sponsored by Materials Today, an Elsevier community dedicated to the creation and sharing of materials science knowledge and experience through their peer-reviewed journals, academic conferences, educational webinars and more.
Thanks to Kolobyte and Alphabot for letting us use their music in the show!
If you have questions or feedback please send us emails at materialism.podcast@gmail.com or connect with us on social media: Instagram, Twitter.
Materialism Team: Taylor Sparks (co-creator, co-host, production), Andrew Falkowski (co-creator, co-host, production), Jared Duffy (production, marketing, and editing)
Keywords: auxetics strain expansion poissons ratio structures materials
Support Materialism: A Materials Science Podcast by contributing to their Tip Jar: https://tips.pinecast.com/jar/materialism