Manufacture of Arbitrary Cross-Section Composite Honeycomb Cores Based on Origami Techniques

Abstract

In recent years, as space structures have become large and require higher accuracy, composite honeycombs, which can reduce weight and have low thermal expansion, are in increasing demand. As observed in the design of antenna reflectors and rocket bodies, both flat and 3D-shaped cores are used in this field. However, these special honeycombs have high manufacturing costs and limited applications. This study illustrates a new strategy to fabricate arbitrary cross-section honeycombs with applications of advanced composite materials. These types of honeycombs are usually manufactured from normal flat honeycombs by curving or carving, but the proposed method enables us to construct objective shaped honeycombs directly. The authors first introduce the concept of the kirigami honeycomb, which is made from single flat sheets and has periodical slits resembling origami. In previous studies, honeycombs having various shapes were made using this method, and were realized by only changing folding line diagrams (FLDs). In this study, these 3D kirigami honeycombs are generalized by numerical parameters and fabricated using a newly proposed FLD design method, which enables us to draw the FLD of arbitrary cross-section honeycombs. Next, the authors describe a method of applying this technique to advanced composite materials. Applying the partially soft composite techniques, folding lines are materialized by silicon rubber hinges on carbon fiber reinforced plastic. Complex FLD patterns are then printed using masks on carbon fabrics. Finally, these foldable composites that are cured in corrugated shapes in autoclaves are folded into honeycomb shapes, and some typical samples are shown with their FLDs.

An Approach to Designing Origami-Adapted Aerospace Mechanisms

“…Other applications of origami to space mechanisms include designing lightweight honeycomb structures, deployable phased array antennas, and telescopes [3,4,17]. These origami applications range from direct to abstract applications of origami.…”

“…Many of these design considerations are highly coupled, such as accommodating for thickness and rigidity, thus requiring iteration to find the desired result. Researchers have developed numerous tools to help facilitate designs requiring rigid-foldability [24,25], thickness [2,26], hinge selection [27], actuation methods [28][29][30][31], and manufacturing methods [1,17].…”

AUXHEX – A Kirigami inspired zero Poisson’s ratio cellular structure

“…Saito et al [19] have also developed a mathematical tool that creates Kirigami cutting/folding line diagrams for honeycombs that require complex curvatures, without any machining and therefore, material waste. The Jet Propulsion Laboratory (JPL) is working on Origami/Kirigami inspired deployable solar panels [20] and, using flexible solar cells, Lamoureux and co-authors produced a prototypal dynamic Kirigami solar panel with integrated solar tracking [21].…”

Material selection shape factors for compliant arrays in bending

“…CAs can also be modified to create thick-material approximations of curved-crease origami patterns used in origami-inspired mechanisms and structures [8]. While the body of work investigating stiff and light panels is extensive and ongoing through a variety of avenues [9][10][11][12][13][14][15][16][17][18][19], there is significantly less research describing methods to create panels with a lower, yet selectable, stiffness to enable large amounts of elastic deflection. Recent informative work by Ohshima et al investigates the analysis and design of slit-based materials [20], which can also be classified as a type of CA.…”