Hysteresis in swelling and in sorption of wood tissue
Hysteresis in swelling and in sorption of wood tissue
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DOI：
10.1016/j.jsb.2013.03.003
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发表时间：
2013-06-01
影响因子：
3
通讯作者：
Carmeliet, Jan
中科院分区：
文献类型：
--
作者：
Patera, Alessandra;Derome, Dominique;Carmeliet, Jan
采用高分辨率同步辐射相对比x射线层析显微镜研究了孔隙度在45% ~ 78%之间的4种云杉（Picea abies， L. Karst）木材组织均匀样品的膨胀和收缩过程。我们报告可逆的水分引起的正交各向异性膨胀/收缩应变的测量。当膨胀/收缩应变作为相对湿度的函数时，除了非常高孔隙率的样品外，可以观察到滞后现象。当考虑膨胀/收缩应变与水分含量时，迟滞不再存在，这表明木材变形的程度是相同的，无论一定数量的水分是解吸还是吸附。此外，在切向和径向上，膨胀各向异性随着孔隙度的增加而增加。一组细胞的最均匀行为是在30-50个细胞中发现的，较小/较大的组具有较高的变化阶数。(c) 2013爱思唯尔公司版权所有。
The swelling and shrinkage of four Picea abies (L. Karst) wood tissue homogeneous samples, of porosity varying between 45% and 78%, is documented with high-resolution synchrotron radiation phase-contrast X-ray tomographic microscopy. We report measurements of the reversible moisture-induced orthotropic swelling/shrinkage strains. Hysteresis is observed when the swelling/shrinkage strain is considered as a function of relative humidity, except for the very high porosity sample. Hysteresis is no longer present when swelling/shrinkage strains are considered versus moisture content, indicating that wood deforms to the same extent whether an amount of moisture is desorbed or adsorbed. Furthermore, swelling anisotropy, in the tangential and radial directions, is found to increase with increasing porosity. The most homogeneous behaviour for a group of cells is found for 30-50 cells, smaller/larger groups having higher orders of variations. (c) 2013 Elsevier Inc. All rights reserved.