Analysis Of The Hollow Structure With Functionally Gradient Materials Of Moso Bamboo

Bamboo is a fiber-reinforced bio-composite with superior structural behavior. Itshollow structure as well as fiber gradient distribution is the embodiment of itssuperior construction. To validate this, the effect of hollow structure and fiber gradientdistribution on bamboo structural behavior is analyzed in this article based on bambootensile test and numerical methods. The main contents are as follows:(1) Based on the goal of analyzing the mechanical properties of each componentof bamboo, bamboo fiber and parenchymatous tissue are taken as basic units. Fibervolume fractions of different parts of bamboo are measured by using microscopytechniques and image processing techniques for the purpose of investigating thespatial distribution of bamboo fiber.(2) The tensile properties of different parts of bamboo are obtained throughtensile tests, including elastic modulus and tensile strength. The correlations betweenthe mechanical properties of bamboo and volume fractions of fiber are analyzed byassociating them with each other. The elastic modulus and tensile strength of bamboofiber and parenchymatous tissue were estimated according to the linear equationsobtained by regression analysis.(3) According to the tensile properties of bamboo fiber and parenchymatoustissue, multi-laminate material models and fiber-based models are built forcomparative analysis in order to validate the superiority of bamboo hollow structureand fiber gradient distribution, respectively. Numerical hollow models and solidmodels with the equivalent volume are built to make comparative analysis on theirmechanical behavior as well as models of uniform fiber distribution and models ofgradient fiber distribution.