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Erschienen in: Wood Science and Technology 5-6/2009

01.08.2009 | Original

Mode I interlaminar fracture property of moso bamboo (Phyllostachys pubescens)

verfasst von: Zhuo-Ping Shao, Chang-Hua Fang, Gen-Lin Tian

Erschienen in: Wood Science and Technology | Ausgabe 5-6/2009

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Abstract

Bamboo is a unidirectional fiber-reinforced bio-composite. Once having cracks, the delaminating propagation is not controlled by the strength but by the interlaminar fracture toughness. In this paper, the behaviors of Mode I (crack opening mode) interlaminar fracture parallel to grain of moso bamboo (Phyllostachys pubescens) were studied. Based on energy theory, the Mode I interlaminar fracture toughness, G IC, was measured using the double cantilever beam specimens, and the fracture surfaces were examined under scanning electron microscope. The results show that: (1) the interlaminar fracture toughness of Mode I is the basic characteristic of bamboo material. The mean value of G IC = 358 J/m2 (coefficient of variation = 16.88%) represents the resistance arresting crack propagation. No significant difference was found for G IC among the specimens located at different heights of the bamboo. (2) Due to the low G IC of bamboo, the crack propagation parallel to grain developed easily. The crack was a self-similar fracture without fiber-bridging. On the fracture surfaces, smooth fibers and plane ground tissue were found at the extended area of Mode I fracture along the longitudinal direction. Under scanning electron microscope, it could be seen that the crack propagation developed along the longitudinal interface between fibers or ground tissue. It indicates that the longitudinal interface strength was weak among bamboo cells.

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Metadaten
Titel
Mode I interlaminar fracture property of moso bamboo (Phyllostachys pubescens)
verfasst von
Zhuo-Ping Shao
Chang-Hua Fang
Gen-Lin Tian
Publikationsdatum
01.08.2009
Verlag
Springer-Verlag
Erschienen in
Wood Science and Technology / Ausgabe 5-6/2009
Print ISSN: 0043-7719
Elektronische ISSN: 1432-5225
DOI
https://doi.org/10.1007/s00226-009-0265-2

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