A hemihelix is a curved geometric shape consisting of a series of heliceswith alternating chirality, connected by a perversion at the reversals.[1][2]
The formation of hemihelices with periodic distributions of perversions in slender structures is understood in terms of competing buckling instabilities generated by in-plane stresses.[3]
Animatic of a Rotating Hemihelix
https://en.wikipedia.org/wiki/Hemihelix
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