11 April 2017 Self-folding structure using light-absorption of polystyrene sheet
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The self-folding of polystyrene sheet can be realized by the localized thermal absorption in narrow area, and it is easily achieved by light and black-colored line pattern printing. Lighting to polystyrene sheet provides thermal energy stored in infrared ray to black-colored area except transparent area, then the polystyrene sheet near black-colored area becomes glass transition state. The extreme thermal contraction deformation at black area results in folding deformation of polystyrene sheet. In this paper, various self-folding structure u sing the light-absorption folding technique of polystyrene sheet can be designed and manufactured . For prediction of light-activated folding behavior of polystyrene sheet, the cohesive line element is employed . In the cohesive line element, the additional nodes are defined at folded line, and the discontinued folding angles can be identified and be analyzed from finite element analysis .
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Yonghee Lee, Yonghee Lee, Maenghyo Cho, Maenghyo Cho, } "Self-folding structure using light-absorption of polystyrene sheet", Proc. SPIE 10165, Behavior and Mechanics of Multifunctional Materials and Composites 2017, 101650L (11 April 2017); doi: 10.1117/12.2259911; https://doi.org/10.1117/12.2259911

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