雷竹人工林竹材物理力学性质

为了有效利用雷竹Phyllostachys praecox竹材,对雷竹人工林竹材物理力学性质进行了研究.结果表明:竹龄对雷竹的物理力学性质有显著的影响;竹材的径向、弦向和体积干缩系数随竹龄增加逐渐减小;基本密度、顺纹抗压强度、顺纹抗拉强度和抗弯强度都随竹龄增加而增加,至4～5年生较稳定.竹秆由下至上,含水率和干缩性逐渐减小;维管束密度和基本密度逐渐增加,力学强度亦相应提高.根据材性来看,竹材的采伐利用以4～5年生为合适.表3参10

Physico-mechanical properties of planted Phyllostachys praecox

Physico-mechanical properties of planted Phyllostachys praecox were studied for the effective application of it. The results showed that age had a remarkable effect on the physico-mechanical properties. The radial shrinkage coefficient, chord shrinkage coefficient and cubage shrinkage coefficient decreased with the increase in age while the basic density, compression strength along grain, tensile strength along grain and bending strength increased with the age, and became stable at the age of 4-5 years. From the bottom to the top, the moisture content and shrinkage coefficient reduced gradually; the vascular bundle density, basic density and mechanical strength correspondingly increased. Judging by the properties, P.*"praecox of 4-5 years old are suitable for cutting and applying.