撑绿竹不同方向及年龄竹材物理力学性能比较

Comparison on the Physical Property and Mechanical Strength of Bambusa pervariabilis×Dendrocalamopsis grandis

对撑绿竹不同方向及年龄的竹材物理力学性能进行了研究,结果表明,撑绿竹不同方向竹材的物理力学性能之间存在着一定的差异,但差异不显著,说明撑绿竹的东西南北各个方向对竹材的物理和力学性能均没有显著影响。另外,不同年龄撑绿竹的竹材物理力学性能之间也存在着一定的差异,1.5年龄的基本密度、气干密度和顺纹抗剪强度、抗弯强度均小于2.5年龄,而1.5年龄的各气干及全干干缩率和顺纹抗拉强度、顺纹抗压强度、抗弯弹性模量等均大于2.5年龄,但除抗弯弹性模量差异较大外,其他差异均较小。

The analysis on the physical and mechanical properties of Bambusa pervariabilis×Dendrocalamopsis grandis in all the four directions showed that there were some differences among different directions not significant,indicating that directions had little effect on the physical and mechanical properties.In addition,there were some differences in the physical and mechanical properties among different ages.The basic density,air-dry density,shear strength parallel to grain,bending strength of the 1.5-year-old bamboo were less than that of 2.5-year-old bamboo,while the air-dry and full-dry shrinkage rate,tensile strength parallel to grain,compressive strength parallel to grain,modulus of elasticity of 1.5-year-old bamboo were more than that of the 2.5-year-old bamboo.There was no significant difference among them except the modulus of elasticity.