Micromechanical Model And Finite Element Analysis Of Bamboo

Bamboo is a kind of natural composite material with reproducible and biodegradable property, and mainly consists of cellulose, lignin and hemi-lignin, also it has many advantages: fast-growing, high productivity and high strength. Research shows that bamboo is a sort of construction material with property of high efficiency and low energy consumption. Currently, the bamboo industry still remains in the phase of the primary process at home and abroad because of the lack of consideration of mechanical properties. This paper takes phyllostachys pubescens as research subject which is composed of vascular bundles and matrix, and sets up the quantitative relation between the micro mechanism and mechanical performance. The main conclusions of this paper are included below:1. Proposed the vascular bundles'space distribution rule of phyllostachys pubescens by micro-techniques and image processing techniques. The results show that the density of vascular bundles increases gradually from inner to outer in radial direction of sections, and the volume ratio of vascular bundles increases in linear with the increasing height of internodes of bamboo.2. Set up the quantitative relation between the volume ratio of vascular bundles and mechanical performance of the test materials with the mixing rule through the experiments on more than 500 samples, and acquired the tensile and compressive elastic modulus, tensile strength and compressive strength, and also the Poisson ratio of the sample.3. Numerical simulation with Ansys is made to make further research in this paper. The simulation results demonstrate that the mechanical model provided in this paper is very effective.