Quasi-brittle fracture criterion of bamboo-based fiber composites in transverse direction based on boundary effect model

Wen Liu, Ying Yu, Xiaozhi Hu, Xiangyu Han, Peng Xie

Research output: Contribution to journalArticle

1 Citation (Scopus)

Abstract

Bamboo and engineered bamboo products have gathered increasing scientific and technological interests for its promising applications in sustainable engineering purpose. Bamboo-based fiber composites, a main example of engineered bamboo products, is fabricated from processing the raw bamboo bundles treated with water-soluble resin into a bamboo fiber reinforced bio-composite. The present work investigates the transverse mode-I fracture criterion of bamboo-based fiber composites: the tensile strength f t and fracture toughness K IC . The fiber bundles are taken as the “aggregates” of this material, and the average grain size G is determined as 0.4 mm. By the experimental curve between the applied load and the mid-span deflection from the three-point-bending test on single edge notched specimens, the fracture process as well as the crack development includes three stages: linear, softening and failure stages. The quasi-brittle fracture criterion is calculated with the experimental peak load P max according to the boundary effect model in non-linear elastic fracture mechanics. Also, the normal distribution analysis is applied to cover all the experimental scatters with desired reliability. Furthermore, the method in this work on bamboo-based fiber composites can be extended to study other fiber reinforced composites.

Original languageEnglish
Pages (from-to)347-354
Number of pages8
JournalComposite Structures
Volume220
DOIs
Publication statusPublished - 15 Jul 2019

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Bamboo
Brittle fracture
Fibers
Composite materials
Direction compound
Bending tests
Normal distribution
Fracture mechanics
Fracture toughness
Tensile strength
Resins
Cracks
Water
Processing

Cite this

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abstract = "Bamboo and engineered bamboo products have gathered increasing scientific and technological interests for its promising applications in sustainable engineering purpose. Bamboo-based fiber composites, a main example of engineered bamboo products, is fabricated from processing the raw bamboo bundles treated with water-soluble resin into a bamboo fiber reinforced bio-composite. The present work investigates the transverse mode-I fracture criterion of bamboo-based fiber composites: the tensile strength f t and fracture toughness K IC . The fiber bundles are taken as the “aggregates” of this material, and the average grain size G is determined as 0.4 mm. By the experimental curve between the applied load and the mid-span deflection from the three-point-bending test on single edge notched specimens, the fracture process as well as the crack development includes three stages: linear, softening and failure stages. The quasi-brittle fracture criterion is calculated with the experimental peak load P max according to the boundary effect model in non-linear elastic fracture mechanics. Also, the normal distribution analysis is applied to cover all the experimental scatters with desired reliability. Furthermore, the method in this work on bamboo-based fiber composites can be extended to study other fiber reinforced composites.",
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Quasi-brittle fracture criterion of bamboo-based fiber composites in transverse direction based on boundary effect model. / Liu, Wen; Yu, Ying; Hu, Xiaozhi; Han, Xiangyu; Xie, Peng.

In: Composite Structures, Vol. 220, 15.07.2019, p. 347-354.

Research output: Contribution to journalArticle

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