Abstract
In this paper, the tensile behavior, including the tensile strength, the stress-strain curve and the crack propagation process of Moso bamboo (Phyllostachys pubescens) before and after heat treatment was studied. The microstructure and chemical composition analysis was conducted to discover the mechanism underneath the mechanical behavior. The tensile strength decreases with the increasing treating temperature. The chemical analysis indicated that the decomposition of cellulose and hemicellulose is responsible for the decrease of tensile strength. The unique composite structure of bamboo makes it shows stepwise failure behavior under uniaxial tensile load. During tension, the fiber sheaths dispersing in the ground parenchymatous break dispersively, making the strain-stress curve fluctuate like stairs. And the fluctuations become more obvious with the increase of treating temperature. The microstructure analysis indicates that the structural change of the fiber cell wall is responsible for the more fluctuant strain-stress curve.
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