Liu, Yuxing;
Wei, Hangchuan;
Colletti, Marjan;
Grigoriadis, Konstantinos;
(2025)
Programming bilayer structures in 4D-printed hygromorphs by tailoring porosity in macroscale.
In:
Architectural Informatics: Proceedings of the 30th International Conference on Computer-Aided Architectural Design Research in Asia (CAADRIA 2025): volume 2.
(pp. pp. 449-458).
Association for Computer-Aided Architectural Design Research in Asia (CAADRIA)
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Abstract
The study investigates the impact of macroscale porosity on deformation in 4D-printed hygromorphic bilayer structures, focusing on applications in building envelopes. Aiming to reduce cost and material use, the research, inspired by biomimetic principles, investigates the combination of an active layer with high moisture responsiveness (printed with wood filament) and a passive layer (fabricated with normal PLA) for structural stability. The qualitative relationship between porosity in the active and passive layers and the deformation parameters are assessed in three experiments. Results reveal that (1) active layer porosity (P?) is directly related to response speed, (2) passive layer porosity (P?) significantly affects deformation magnitude, (3) a balanced porosity ratio (R?) between layers enables controlled, predictable shape transformation. Findings from the experiments inform a proposed design application consisting of three prototypes that demonstrate the potential for adaptive building envelopes which dynamically adjust to environmental humidity, providing energy-efficient shading. This work contributes a novel framework for programmable material design, achieving maximum architectural functionalities with minimal material use. Furthermore, it lays the groundwork for further exploration of cross-scale porosity design, aiming to optimize precise deformation control in adaptive architectural systems.
| Type: | Proceedings paper |
|---|---|
| Title: | Programming bilayer structures in 4D-printed hygromorphs by tailoring porosity in macroscale |
| Event: | 30th International Conference on Computer-Aided Architectural Design Research in Asia (CAADRIA 2025), March 22-29, 2025, Tokyo, Japan |
| Location: | Tokyo |
| Dates: | 22 Mar 2025 - 29 Mar 2025 |
| Open access status: | An open access version is available from UCL Discovery |
| Publisher version: | https://caadria.org/new/wp-content/Downloads/CAADR... |
| Language: | English |
| Additional information: | This version is the version of record. For information on re-use, please refer to the publisher’s terms and conditions. |
| Keywords: | Material programming, hygromorph material, building envelope, macroscale porosity, bilayer structure, 4D |
| UCL classification: | UCL UCL > Provost and Vice Provost Offices > UCL BEAMS UCL > Provost and Vice Provost Offices > UCL BEAMS > Faculty of the Built Environment UCL > Provost and Vice Provost Offices > UCL BEAMS > Faculty of the Built Environment > The Bartlett School of Architecture |
| URI: | https://discovery.ucl.ac.uk/id/eprint/10206903 |
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