| id |
caadria2019_624 |
| authors |
Gupta, Sachin Sean, Jayashankar, Dhileep Kumar, Sanandiya, Naresh D, Fernandez, Javier G. and Tracy, Kenneth |
| year |
2019 |
| title |
Prototyping of Chitosan-Based Shape-Changing Structures |
| doi |
https://doi.org/10.52842/conf.caadria.2019.2.441
|
| source |
M. Haeusler, M. A. Schnabel, T. Fukuda (eds.), Intelligent & Informed - Proceedings of the 24th CAADRIA Conference - Volume 2, Victoria University of Wellington, Wellington, New Zealand, 15-18 April 2019, pp. 441-450 |
| summary |
In the built environment, the typical means of achieving responsive changes in the physical features of a structure is through energy-intensive actuation mechanisms that contradict the intended goal of energy-efficient performance. Nature offers several alternative energy-free examples of achieving large-scale shape change through passive actuation mechanisms, such as the intrinsic response of water-absorbing (hygroscopic) materials to humidity fluctuations. We utilize this principle of passive actuation in the context of chitosan biopolymer, a material demonstrating a combination of mechanical strength and hygroscopic potential that enables it to serve for both load-bearing and actuation purposes. By inserting biocomposite films of chitosan as dynamic tensile members into a space truss, a structural system is constructed whose variable structural performance is manipulated and expressed as a large-scale, programmable, and fast-acting shape change. We present a method for rationalizing this responsive structural system as an assembly using a combination of materials engineering and digital design and fabrication. As a proof-of-concept, a two-meter-long fiber-reinforced cantilevering truss prototype was designed and fabricated. The truss transforms in minutes from one shape that shelters the interior from rain to another shape that acts as an air foil to increase ventilation. |
| keywords |
Passive Actuation; Chitosan; Structural Assembly; Digital Fabrication |
| series |
CAADRIA |
| email |
|
| full text |
 file.pdf (14,982,127 bytes) |
| references |
Content-type: text/plain
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| last changed |
2022/06/07 07:50 |
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