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Open AccessArticle

Bending Flexibility of Moso Bamboo (Phyllostachys Edulis) with Functionally Graded Structure

1,2, 1,2, 1,* and 1,*
1
International Centre for Bamboo and Rattan, Beijing 100102, China
2
National Forestry and Grassland Administration/Beijing Co-build Key Laboratory of Bamboo and Rattan Science & Technology, Beijing 100102, China
*
Authors to whom correspondence should be addressed.
Materials 2019, 12(12), 2007; https://doi.org/10.3390/ma12122007
Received: 30 May 2019 / Revised: 19 June 2019 / Accepted: 21 June 2019 / Published: 23 June 2019
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Abstract

As one of the most renewable and sustainable resources on Earth, bamboo with its high flexibility has been used in the fabrication of a wide variety of composite structures due to its properties. A bamboo-based winding composite (BWC) is an innovative bamboo product which has revolutionized pipe structures and their applications throughout China as well as improving their impact on the environment. However, as a natural functionally graded composite, the flexibility mechanism of bamboo has not yet been fully understood. Here, the bending stiffness method based on the cantilever beam principle was used to investigate the gradient and directional bending flexibility of bamboo (Phyllostachys edulis) slivers under different loading Types during elastic stages. Results showed that the graded distribution and gradient variation of cell size of the fibers embedded in the parenchyma cells along the thickness of the bamboo culm was mainly responsible for the exhibited gradient bending flexibility of bamboo slivers, whereas the shape and size difference of the vascular bundles from inner to outer layers played a critical role in directional bending flexibility. A validated rule of mixture was used to fit the bending stiffness under different loading Types as a function of fiber volume fraction. This work provides insights to the bionic preparation and optimization of high-performance BWC pipes. View Full-Text
Keywords: bending flexibility; graded structure; directional structure; vascular bundles; parenchyma cells bending flexibility; graded structure; directional structure; vascular bundles; parenchyma cells
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Wei, X.; Zhou, H.; Chen, F.; Wang, G. Bending Flexibility of Moso Bamboo (Phyllostachys Edulis) with Functionally Graded Structure. Materials 2019, 12, 2007.

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