The creep of wood destabilized by change in moisture content. Part 1: The creep behaviors of wood during and immediately after drying
The creep of wood destabilized by change in moisture content. Part 1: The creep behaviors of wood during and immediately after drying
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木材的蠕变因含水量的变化而不稳定。
DOI：
10.1515/hf.2004.040
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发表时间：
2004
影响因子：
3.3
通讯作者：
["C. Takahashi
中科院分区：
文献类型：
--
作者：
["C. Takahashi
摘要为了更好地理解机械吸附蠕变，比较了木材样品在干燥过程中、干燥后即刻以及在恒温恒湿条件下长时间调节后的蠕变行为。在干燥后立即测试的样品中的蠕变大于在等于干燥后的相对湿度下长时间调节的样品中的蠕变，尽管这些样品具有几乎相同的水分含量（MC）。虽然已经长时间湿度调节的木材处于稳定状态，但干燥后立即测试的木材被认为处于不稳定状态。此外，干燥过程中测试的样品的蠕变大于干燥后立即测试的样品的蠕变。还发现，不稳定性随时间降低，表明在干燥过程中同时发生稳定和不稳定。在最近的研究中，已经报道了在MC或温度变化之后，木材的弹性模量立即降低并且流动性增加。这些发现归因于MC或温度变化引起的不稳定性。基于本研究的结果和最近的研究，我们认为流动性的增加，木材的MC的变化归因于不稳定性。
Abstract To better understand mechano-sorptive creep, creep behaviors were compared in wood samples during the drying process, immediately after drying, and after a long conditioning under constant humidity and temperature. Creep was greater in the sample tested immediately after drying than in the sample conditioned for a long time under relative humidity equal to that after drying, despite the fact that these samples had almost the same moisture content (MC). While the wood that has been moisture-conditioned for a long time is in a stable state, the wood tested immediately after the drying is presumed to be in an unstable state. Moreover, creep of the sample tested during the drying process was greater than that of the sample tested immediately after the drying. It has also been found that the instability decreased with time, indicating that stabilization and destabilization occur simultaneously during the drying process. In recent studies, a decrease in the elastic modulus and an increase in the fluidity of wood immediately after a change in MC or temperature have been reported. These findings are attributed to the instability caused by changes in MC or temperature. Based on the results of the present study and recent studies, we consider the increase in the fluidity of wood as the MC changes to be attributable to instability.