Umbrella leaves-Biomechanics of transition zone from lamina to petiole of peltate leaves.

Abstract:

:In this study we aim to show how the peltate leaves of Colocasia fallax Schott and Tropaeolum majus L., despite their compact design, achieve a rigid connection between petiole and lamina. We have combined various microscopy techniques and computed tomography (CT) scanning for the analysis of the basic structure of the plant's stabilization system. Mechanical tests yielded key mechanical parameters and allowed us to assess the mode of failure. The results of the tests were further processed in a finite element method (FEM) analysis. We were able to show that both plants are able to endure high loads irrespective of the different composition of the supporting structure. C. fallax forms many separate branched strands, whereas T. majus forms fewer strands of greater diameter interconnected in the centre of the transition area, forming a bundle of irregular orientation. This results in different ways to dissipate loads on the lamina. In C. fallax we observed the outer strands of the strengthening tissue under high stress while the inner bundle carries little load. In T. majus the load is distributed more evenly through the juncture in the middle of the transition area. Potential applications include the construction of biomimetical flying roofs.

journal_name

Bioinspir Biomim

authors

Sacher M,Lautenschläger T,Kempe A,Neinhuis C

doi

10.1088/1748-3190/ab2411

subject

Has Abstract

pub_date

2019-06-20 00:00:00

pages

046011

issue

4

eissn

1748-3182

issn

1748-3190

journal_volume

14

pub_type

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