Demonstration of multi-layered inflatables: Asymmetric-shaped inflatable structures by stacked planar sheets

Author

Sakuma, Ryota and Sakai, Yusuke and Kawahara, Yoshihiro and Hiraki, Takefumi

Abstract

We present “Multi-Layered Inflatables, a novel multi-layered inflatable structure that enables the design and fabrication of complex, asymmetric 3D forms from stacked planar sheets. Our approach employs some thin sheets that are assembled with distinct bonding patterns to form three separate air chambers. Two outer pairs form the external surfaces, while the intermediate chamber serves as an internal layer that reinforces the structure against external forces. By controlling the bonding patterns and independently tuning the pressure in each chamber using a low boiling point liquid (e.g., Novec), we achieve localized in-plane contraction and expansion. This allows us to generate forms such as dome-and-flat hybrids or other non-uniform surfaces—configurations that were previously challenging to obtain with single-layer or conventional methods. Additionally, the internal chamber increases the overall stiffness by counteracting the deformation of the external surfaces.