6种木材的解剖特征与物理力学性能分析

Analysis of Anatomical Character and Physical-mechanical Performance of 6 Wood Species

  • 摘要: 为进一步研究榉木、西南桦、橡胶木、白蜡木、天然柚木和人工柚木6种木材的弯曲加工性能,通过对不同树种导管比量、纤维长度、密度、干缩系数弦径比、最大载荷、抗弯强度、抗弯弹性模量以及最大压弯变形量进行测量对比。结果表明:6种木材中榉木导管比量和木纤维长度与其他5种木材差异明显,其导管比量大小排序为榉木>白蜡木>西南桦>人工柚木>天然柚木>橡胶木,木纤维长度大小排序为榉木>白蜡木>橡胶木>天然柚木>人工柚木>西南桦;西南桦密度与其他5种木材差异明显,榉木、橡胶木、白蜡木、天然柚木和人工柚木间密度差异不明显,且均属于中等密度;在2种状态下,6个树种的径向干缩湿胀率均小于弦向干缩率,而榉木的弦径比最大,天然柚木最小;6种木材中西南桦的破坏载荷、抗弯强度和弹性模量均最大,而白蜡木的压弯变形量最大,天然柚木最小,其压弯变形量大小排序为白蜡木>西南桦>人工柚木>榉木>橡胶木>天然柚木。

     

    Abstract: To further study of the bending processing performance of six wood species, such as Zelkova schneideriana, Betula alnoides, Hevea brasiliensis, Fraxinus chinensis, natural Tectona grands and artificial Tectona grands. The proportion of vessel tissues, fiber length, density, whrinkage and bulging, maximum load, MOR, MOE and maximum bending deformation were studied. The results indicated that study the proportion of vessel tissues and fiber length of Z. schneideriana were significantly different from those of other 5 wood species. The order of the proportion of vessel tissues size is as follows: Z. schneideriana> F. chinensis > B. alnoides > artificial T. grands > natural T. grands > H. brasiliensis. The order of fiber length size is as follows: Z. schneideriana> F. chinensis > H. brasiliensis > artificial T. grands > natural T. grands > B. alnoides. The density of B. alnoides was significantly different from that the other 5 species, and the density difference among Z. schneideriana, H. brasiliensis, F. chinensis, natural T. grands and artificial T. grands is not significantly, and they are all moderate density; The whrinkage and bulging of radial direction smaller than the tangential direction of 6 wood species in 2 condition. While the chord ratio of the Z. schneideriana is the largest, and the natural T. grands is the smallest; The maximum load, MOR, MOE of B. alnoides are the largest among the 6 wood species. The F. chinensis has the best bending performance, and the natural T. grands has the worst bending performance. The order of bending deformation size is as follows: F. chinensis > B. alnoides> artificial T. grands > Z. schneideriana> H. brasiliensis > natural T. grands.

     

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