The elasticity and vertical distribution of stress within stems of Picea sitchensis.
The elasticity and vertical distribution of stress within stems of Picea sitchensis.
复制标题
锡琴云杉茎内应力的弹性和垂直分布。
DOI：
10.1093/treephys/5.2.195
复制
发表时间：
1989
期刊：
影响因子：
4
通讯作者：
P. Blackburn
中科院分区：
文献类型：
--
作者：
R. Milne;P. Blackburn
8株22岁的云杉（Picea sitchensis, Bong.）卡尔。在苏格兰的森林里，人们用绞车和缆绳把树弄弯。弯曲杆的形状采用悬臂梁的结构理论建模，考虑了非均匀的杆锥度和大挠度。茎的杨氏弹性模量估计为2.0-6.4 GPa，低于该树种的锯绿木材，但与完整的绿茎段相似。应力沿茎的纵向分布在与锥度有关的高度处达到最大值。茎尖越细，最大应力越高。
Eight 22-year-old Picea sitchensis (Bong.) Carr. trees growing in a Scottish forest were bent using a winch and cable. The shapes of the bent stems were modeled using the structural theory of a cantilever beam, with non-uniform stem taper and large deflections taken into account. The Young's modulus of elasticity for the stems was estimated to be 2.0-6.4 GPa, which is lower than that reported for sawn green timber of this species, but similar to that for intact green stem sections. The longitudinal distribution of stress along the stems had a maximum at a height that was dependent on taper. Maximum stress occurred higher up in the more tapered stems.