Mode I Fracture Toughness of Tangential Moso Bamboo

Minmin Xu, Xiuming Wu, Huanrong Liu, Zhengjun Sun, Guangnan Song, Xiubiao Zhang, Shuangxi Zhao

Abstract


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 •m1/2. 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.

Keywords


Fracture; COD gauge; Crack opening displacement; Fracture toughness

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