Analysis of cold temperature effect on stress wave velocity in green wood

Analysis of cold temperature effect on stress wave velocity in green wood
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低温对生材应力波速的影响分析

DOI:
10.1515/hf-2013-0151
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发表时间:
2014-08
期刊:
影响因子:
2.4
通讯作者:
王立海
王立海
中科院分区:
材料科学3区
文献类型:
--
作者:
徐华东;王立海

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研究了在0°C以下温度对绿色木材应力波速度的影响。通过野外和室内试验,研究了不同含水率条件下低温对红松立木和小木材SWV的影响。正如预期的那样,SWV在木材中随着温度的降低而增加。然而,在0°C附近,SWV增量不是线性的,而是在MC高于50%时显示出不成比例的高增量。为了解释这种现象,在各种MC和温度下进行差示扫描量热仪(DSC)测量,即,分析了水聚集状态与SWV的相关性。SWV作为温度函数的不规则行为的解释很简单:绿色木材中的自由水和一小部分结合水在零摄氏度(0°C)以下从水转化为冰。因此,在0°C以下不成比例的高SWV增量反映了水的聚集变化,因为冰中的SWV高于液态水中的SWV。
The objective of this study was to investigate the effect of temperature on stress wave velocity (SWV) in green wood below zero degress centigrade (0°C). Both field and laboratory tests were conducted on standing Korean pine trees and small wood samples to study the effects of low temperature at various moisture content (MC) on SWV. As expected, SWV in wood increased with decreasing temperature. However, near 0°C, the SWV increment was not linear but showed disproportional high increments at MCs above 50%. To explain this phenomenon, differential scanning calorimeter (DSC) measurements were performed at various MCs and temperatures, i.e., the interrelation between the state of water aggregation and SWV was analyzed. The explanation of the irregular behavior of SWV as a function of temperature is straightforward: free water and a small portion of bound water in green wood are transformed from water to ice below zero degrees (0°C) centigrade. Thus the disproportional high SWV increment below 0°C reflects the aggregation change of water because the SWV in ice is higher than that in liquid water.
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