At McGill University in Canada, researchers Morad Mirzajanzadeh and Damiano Pasini have developed an origami-based structural pattern that turns flat sheets into three-dimensional, doubly curved forms. Detailed in Nature Communications, the design shifts between flexible and rigid configurations through adjustable internal tendons. McGill’s Faculty of Engineering presented the work as a “novel origami pattern” for load-bearing 3D technology, framing it as an advance in materials and manufacturing rather than a finished construction product.
The basic design is a “doubly curved lens-box” pattern. Curved folds and straight connectors combine to form a smooth, three-dimensional surface, while tendons threaded through selected points adjust its mechanical response after assembly. With the nylon-thread tendons loose, the structure can be folded or compressed, and its shape can be changed. Tightening them increases rigidity and helps lock the form in place. The reconfiguration works mechanically through tension, not through electrical actuation or a change in the material itself.
How the Pattern Works
Foldable structures face a persistent engineering trade-off: deployable designs can be flexible but weak, while rigid structures are harder to fold, transport or reconfigure. The McGill pattern uses a calculated arrangement of curved folds and straight connectors to address that tension, producing smooth forms instead of relying only on flat or sharply faceted surfaces. Demonstrated geometries include lens-like and spherical shapes, along with toroidal and container-like forms.
To design the fold maps, the team used differential geometry and numerical improvement. Researchers then laser-cut prototypes from 0.21-millimeter cellulose cardstock and folded them by hand to test whether the computed forms could be made physically. Nylon thread served as adjustable tendons, letting the team alter the structure’s rigidity after folding.
Strength from Geometry and Tension
The folded forms get their strength from their geometry and material, as well as the tension applied through the tendons. Their three-dimensional shape helps distribute forces, while curvature and pre-tensioning can limit the bending or twisting that might otherwise cause a flat sheet to collapse.
In laboratory tests, an eight-gram arched prototype supported a load 162 times its own weight, four times more than a similar structure stiffened with glue. The researchers also found that changing tendon tension could increase rigidity by several orders of magnitude. The same piece could move among stable configurations before being tightened into a load-bearing arch.
Potential Applications Across Industries
A structure that travels flat and deploys into a curved form could be useful for emergency shelters and protective exoskeletons. Reconfigurable robots are another potential application. Researchers also identify smart textiles and helmets as possible uses, while aerodynamic surfaces could adapt to changing conditions. These are prospective uses of the design, not evidence of commercial deployment.
In medicine, flexible surfaces could be designed to fit the body or bones more closely. Tendon-based control could also inform soft robotics for minimally invasive surgery. More broadly, the pattern combines compact transport with reconfiguration and controllable rigidity, qualities that may matter wherever lightweight, flexible structures are needed.
Limits and Next Steps
The prototypes used laser-cut cellulose cardstock and nylon thread, along with a mechanism for controlling tendon tension. Scaling the design to larger structures would bring further engineering considerations, including gravity and material properties. Manufacturing imperfections also pose a challenge. The work demonstrates physical prototypes at laboratory scale; it does not establish building-code approval or readiness for full-scale construction.
Further research will be needed to adapt the system for larger structures and commercial products. Its potential comes from a geometry-based approach that makes flat sheets foldable and reconfigurable while allowing them to bear loads. That combination could broaden design options for deployable architecture, robotics and other applications.
Talent24h reported the work as a step toward reprogrammable, lightweight structures that could change how we approach building and design.
