Design of Hinge-Line Geometry to Facilitate Non-Plastic Folding in Thin Metallic Origami-Inspired Devices

Abstract

Origami is the traditional art of paper folding, which yields objects that in engineering terms can be considered as mechanisms with relative motion between panels (paper) constrained by hinges (folds). Non-paper materials are often studied for origami-inspired applications in engineering. This article is concerned with material selection appropriate for the hinge function, for which most non-paper materials are lacking either in strength or range of motion. The proposed hinge material of interest is bulk metallic glass (BMG) for its low stiffness, wear and corrosion resistance, biocompatibility, and extreme capacity for elastic deformation. In this paper, panel spacing and geometry are examined to provide insight for designing thin BMG folding membrane hinges that connect larger regions of thicker material (panels). Finite element analysis is performed to study the stress variation, distribution, and displacement along the hinge for several design variations, and several loading profiles are discussed to determine the necessity of modified rounded-edge panels. The results will directly aid in creating origami-inspired designs with membrane hinges and further help with designing devices such as foldable electronics, optical systems, and deployable solar arrays.