Investigation of the resilience of cyclically actuated pine cone scales of Pinus jeffreyi .

Autor:	Ulrich K; University of Freiburg Plant Biomechanics Group @ Botanic Garden, Freiburg im Breisgau, Germany.; Cluster of Excellence livMatS @ FIT-Freiburg Center for Interactive Materials and Bioinspired Technologies, Freiburg im Breisgau, Germany., Genter L; University of Freiburg Plant Biomechanics Group @ Botanic Garden, Freiburg im Breisgau, Germany., Schäfer S; University of Freiburg Plant Biomechanics Group @ Botanic Garden, Freiburg im Breisgau, Germany., Masselter T; University of Freiburg Plant Biomechanics Group @ Botanic Garden, Freiburg im Breisgau, Germany., Speck T; University of Freiburg Plant Biomechanics Group @ Botanic Garden, Freiburg im Breisgau, Germany.; Cluster of Excellence livMatS @ FIT-Freiburg Center for Interactive Materials and Bioinspired Technologies, Freiburg im Breisgau, Germany.
Jazyk:	angličtina
Zdroj:	Bioinspiration & biomimetics [Bioinspir Biomim] 2024 May 21; Vol. 19 (4). Date of Electronic Publication: 2024 May 21.
DOI:	10.1088/1748-3190/ad475b
Abstrakt:	The resilience of pine cone scales has been investigated in the context of current architectural efforts to develop bioinspired passive façade shading systems that can help regulate the indoor climate. As previously shown for other species, separated tissues of Pinus jeffreyi pine cone scales show independent hygroscopic bending. The blocking force that pine cone scales can generate during a closing movement is shown to be affected by the length, width and mass of the scales. After cyclically actuating pine cone scales by submerging and drying them for 102 cycles and comparing their functional characteristics measured in the undamaged and damaged state, they were still able to achieve 97% of their undamaged blocking force and torque and over 94% of their undamaged opening angle. Despite evidence of cracking within the sclereid cell layer and extensive delamination of sclerenchyma fibres, no loss of function was observed in any tested pine cone scale. This functional resilience and robustness may allow P. jeffreyi trees to continue seed dispersal for longer periods of time and to reliably protect seeds that have not yet been released. These results have contributed to a better understanding of the pine cone scale and may provide inspiration for further improving the long-term performance of passive, hygro-sensitive façade shading systems. (© 2024 IOP Publishing Ltd.)
Databáze:	MEDLINE
Externí odkaz:	Zobrazit plný text záznamu