We demonstrate a simple self-folding technique using pre-strained polymer sheets and inkjet printing. The ink patterned on the sheets via a desktop printer absorbs light, which heats locally the polymer underneath the ink and causes folding within seconds. Here, we combine thermal shrinkage and rheological properties of polymer sheets with finite element modeling, and provide insight into the folding mechanism based on macroscopic relaxation dynamics. The folding angle can be determined by a geometric model of strain relaxation.

Study of strain relaxation to control self-folding of pre-strained polymer sheets

245th National Meeting (2013)

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