竹节对竹材力学强度影响的研究

本文对毛竹和刚竹的带节材与不带节竹材的主要力学性质研究表明,带节竹材的抗弯强度、顺纹抗压、抗剪、抗拉强度和冲击韧性都有一定程度降低的趋向,但抗劈开强度和横纹抗拉强度却有明显提高。影响竹材力学强度的主要因素是维管束数量、维管束排列方向及维管束中纤维的力学强度,了解这些规律,对复合材料的结构仿生有重要参考作用。

EFFECT OF BAMBOO NODAL ON MECHANICAL PROPERTIES OF BAMBOO WOOD

The main mechanical properties of Ph. pubescens and Ph. bambusoides with and without nodal were investigated. The results showed that static bending strength, compression strength parallel to grain, shear scrength parallel to grain, tensile strength parallel to grain and toughness in impact bending of the bamboo wood with nodal tend to reduce in a degree. Howerer cleavage strength and tensile strength perpendicular to grain increased obviously. The main factors affecting the mechanical properties of bamboo wood included the quanty of vascular bundle, the orientation of vascular hundles and the fiber strength in vascular bundles. The regularity as indicated above was important for the structure bionic of the composite materials.