# Description
Auxetic materials expand as they are stretched (normal materials contract). This re-entrant structure uses a bow-tie unit cell that is placed in a pattern. As for auxetic structures this is a simple one.
If you want to see the full 3D simulation (interactive viewer, open source) and the [design explained, check out this blogpost!](https://blog.hirnschall.net/auxetic-material)
Below is a short video of the material being stretched
shirnschall
