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Mechanical characterization of single bamboo fibers with nanoindentation and microtensile technique
-
Yan Yu
,
Genlin Tian
Published/Copyright:
November 1, 2010
Abstract
More mechanical information on fibers is needed for better understanding of the complex mechanical behavior of bamboo as well as optimizing design of bamboo fiber based composites. In this paper, in situ imaging nanoindentation and an improved microtensile technique were jointly used to characterize the longitudinal mechanical behavior of fibers of Moso bamboo (Phyllostachys pubescens Mazei ex H. de Lebaie) aged between 0.5 and 4 years. These methods show that 0.5-year-old fibers have similar mechanical performances to their older counterparts. The average longitudinal tensile modulus and tensile strength of Moso bamboo fibers ranges from 32 to 34.6 GPa and 1.43 to 1.69 GPa, respectively, significantly higher than nearly all the published data for wood fibers. This finding could be attributed to the microstructural characteristics of the small microfibrillar angle and scarcity of pits in bamboo fibers. Furthermore, our results directly support the assumption that the widely used Oliver-Pharr analysis method in nanoindentation test significantly underestimates the longitudinal elastic modulus of anisotropic plant cell wall.
Received: 2010-2-7
Accepted: 2010-9-1
Published Online: 2010-11-1
Published in Print: 2011-01-01
©2011 by Walter de Gruyter Berlin New York
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Keywords for this article
bamboo fibers;
in situ nanoindentation;
mechanical properties;
microtension
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