April 26, 2022                                                    feature

Kinematics of stretched sheets

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2022-05-12 16:00:23

April 26, 2022 feature

by Thamarasee Jeewandara , Phys.org

In a new study now published as a report and also illustrated as the online cover-page of Science Advances, Julien Chopin, Arshad Kudrolli, and a research team in Physics in the U.S. and Brazil showed how twisted hyper-elastic sheets formed multi-layered self-scrolled yarns. By incorporating dominant stretching with folding kinematics, they measured torque and energetics originating from geometric nonlinearities. They then introduced a geometric model to explain the formation and structure of such self-scrolled yarns. The outcomes showed how a simple twist of origami in the tensional twist-folding framework led to the transformation of stretchable sheets into self-assembled architectures.

Traditionally, twisting sheets can form functional yarns that rely on millennia of human practice to form catgut bow strings, surgical sutures and fabric wearables; however, the practice still lacks overarching principles that guide the intricacy of such architectures. Scrolled yarns with nested structures can be used to harness energy on batteries and in embedding amorphous materials. Tensional twist folding can transform flat sheets into layered structures via remote boundary regulation. Twist-folding and scrolling can be used to reconfigure and repurpose flat sheets as seen with the multifunctional Rajasthan turban.

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