„A recent finding that throws light on biomimetic approaches in the development of materials refers to the optimization of spatial distribution of fibers in hollow bamboo cylinders in order to reinforce flexural rigidity.
[…] Researchers from Hokkaido University, Prefectural University of Kumamoto and the University of Yamanashi determined the relationship between the distribution of the reinforcing fibers in a culm and the flexural rigidity of the culm by comparing the data obtained from the real bamboo’s fiber distribution to the theoretically established optimal fiber distribution. […]“
source / read more: https://www.azom.com/news.aspx?newsID=47763
The cross section of a wild moso bamboo Phyllostachys pubescens. Fibers (vascular bundles) surrounding the heart-shaped black openings have a denser distribution toward the outer part. (Sato M., et al., PLOS ONE, May 3, 2017)