摘要
为提高冬季木材缺陷判断的可靠性和准确性,实现冬季木材利用的最大化,选择来自哈尔滨林业试验基地的10个东北林区的主要树种,进行应力波在立木冻结与常温状态下传播速度的比较研究。结果表明:冻结状态下立木的应力波纵向传播速度高于常温状态约16.50%,径向传播速度高于常温状态约22.48%,且应力波在冻结与常温状态下的立木内传播速度二者之间存在较强的线性关系;冻结状态下,应力波的传播速度受含水率的影响显著(相关系数多数在0.8以上),而常温状态下没有显著影响。
In order to improve the accuracy and the reliability of identification of defects and to realize the maximal utilization of wood in winter,10 main species in the northeast forest area of Harbin Forest Experimental Station were tested for comparison of stress wave propagating velocities（SWPV） both in frozen state and in normal temperature state. The results showed that the longitudinal and radial propagating velocities of stress wave in frozen standing trees were obviously higher than those in normal temperature standing trees,and there was a high positive correlation relationship between longitudinal velocities in frozen and normal temperature states. While the moisture content of standing trees exceed the fiber saturation point（f. s. p） ,the longitudinal stress wave propagating velocities in frozen state were affected significantly by moisture content,but it was not obvious in the normal temperature state.
出处
《林业科学》
EI
CAS
CSCD
北大核心
2010年第10期124-129,共6页
Scientia Silvae Sinicae
基金
国家自然科学基金(30671643)
"十一五"林业科技支撑课题(2006BAD18B07)
关键词
应力波
立木
冻结状态
常温状态
传播速度
stress wave
standing tree
frozen state
normal temperature state
propagating velocity
