Host: The Japan Society of Mechanical Engineers
Name : [in Japanese]
Date : October 07, 2017 - October 09, 2017
Small scale structures can be manufactured by utilizing surface effects. In this study, a cylindrical structure is formed from a thin film on liquid surface by pulling up a thread connected at the center of the film. The film is being bent during pulling up process due to elasto-capillary, and both ends of the film eventually contacts by surrounding a small liquid volume. The actual structure formed from this proposed method is not a exact cylindrical structure, but a teardrop-shaped structure. To estimate the formed shape, a simple 2D model consisting of a circular arc, tangent lines, and contact parts was established. The central angle and the radius of the teardrop-shaped structure were successfully determined by minimizing the potential energy. As a result, it was revealed that the radius depends on bending stiffness of the film and density of the liquid, but the central angle is constant. The teardrop-shaped structure obtained from the analytical model was compared with experimental results by their areas, and it was shown to be effective.
