Moisture-dependent orthotropic elasticity and strength properties of Chinese fir wood
Moisture-dependent orthotropic elasticity and strength properties of Chinese fir wood
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杉木随湿度变化的正交各向异性弹性和强度特性
DOI：
10.1007/s00107-017-1166-y
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发表时间：
2017-11-01
影响因子：
2.6
通讯作者：
Niemz, Peter
中科院分区：
文献类型：
--
作者：
Jiang, Jiali;Bachtiar, Erik Valentine;Niemz, Peter
弹性和强度特性是力学建模中非常重要的材料特性。由于木材的各向异性和吸湿性，表征木材的机械行为将需要了解其与各向异性的三个主要轴相关的水分依赖特性。含水量（MC）对杉木弹性和强度各向异性的影响。[参考译文]本研究对木材进行了研究。选取各向异性杨氏模量、剪切模量、泊松比、纵向、径向和切向屈服和极限应力值等参数，在不同水分条件下进行压缩和拉伸试验。结果表明，杉木的弹性和强度表现出明显的水分依赖关系。除部分泊松比外，所有研究的弹性和强度参数均随MC的增加而减小，即单个模量和强度值受到MC的不同程度影响。柔度矩阵的二维和三维表示以及屈服面的二维可视化为杉木木材的水分相关弹性和强度各向异性提供了有价值的概述。
Elastic and strength properties are very important material characteristics in mechanical modelling. Due to the anisotropic and hygroscopic nature of wood, a characterization of wood mechanical behavior will require knowledge of its moisture-dependent properties in relation to the three principal axes of anisotropy. The influence of moisture content (MC) on the elastic and strength anisotropy of Chinese fir (Cunninghamia lanceolata[Lamb.] Hook) wood was examined in the present study. Selected parameters, including the anisotropic Young’s moduli, shear moduli, Poisson’s ratios, yield and ultimate stress values in the longitudinal, radial and tangential directions, were determined in compression and tension tests at different moisture conditions. The results indicated that a distinct moisture dependency is exhibited for the elastic and strength behavior of Chinese fir wood. With the exception of some Poisson’s ratios, all investigated elastic and strength parameters were shown to decrease with increasing MC, whereby individual moduli and strength values were affected by the MC to different degrees. The two- and three-dimensional representation of the compliance matrix and the two-dimensional visualization of a yield surface give a valuable overview on the moisture-dependent elastic and strength anisotropy of Chinese fir wood.