Study on the variation law of bamboo fibers’ tensile properties and the organization structure on the radial direction of bamboo stem

Bamboo fiber cell wall was layered composite with fine mechanical properties reinforced by cellulose microfibril with lignin and hemicellulose as amorphous matrix. This paper aimed at study the organization structure and tensile properties of natural bamboo fibers extracted by handwork assisted with a laser micrometry device to monitor the deformation of fibers, and the variation law of tensile properties and organization structure on radial direction of bamboo stem. The results were that the average tensile strength, elastic modulus and strain to failure were 523.20 MPa(SD = 111.65 MPa), 22.27 GPa(SD = 6.29 GPa) and 3.08%(SD = 1.57%). From the inner part to the outer part of bamboo stem, tensile strength of bamboo fibers slightly tended to increase on the whole, while the tensile elastic modulus and the strain to failure had obviously increasing tendency and decreasing tendency respectively. The fracture behavior of fibers nearby the inner part was similar to brittle fracture, while that of the fibers nearby the outer part similar to ductile fracture. The phenomena were in accordance with the variation of the tensile properties of bamboo fibers on the radial direction of bamboo stem, which had closely relation with the variation of the organization structure of bamboo fiber cell wall in radial direction.