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Mode I Fracture Toughness of Tangential Moso Bamboo

Articles

Journal/Conference:

BIORESOURCES

Language:

English

Author:

Xu Minmin; Wu Xiuming; Song Guangnan; Zhang Xiubiao; Zhao Shuangxi

Experts:

Liu Huanrong; Sun Zhengjun

Year:

2014

Volume:

9

Issue:

2

Pages:

2026-2032

Keywords:

Fracture; COD gauge; Crack opening displacement; Fracture toughness

This paper discusses moso bamboo (Phyllostachys pubescens) with initial crack formation by a three-point bending (SENB) method. The corrected indentation load-displacement curve (ISO 13586-2000) and the crack opening displacement in determining the crack tip extended displacement of the specimen (ASTM E399-09) were measured using a COD gauge. Then, the load-displacement curve and the value of PQ were found by the method of 95% stiffness correction. The results showed that the bamboo has good fracture toughness, and, in this experiment, the fracture results showed little difference; the result for fracture toughness can be up to 17.39 MPa .m(1/2). By observing the crack under the microscope and the failure mode, it was found that the crack propagation was not established in accordance with the crack opening direction; rather it extended along the fiber interface.