空洞对木材中应力波传播路径的影响  

Effects of Cavity on Propagation Path of Stress Wave in Wood

作　　者：徐华东[1] 王立海[1] 

机构地区：[1]东北林业大学,哈尔滨150040

出　　处：《东北林业大学学报》2014年第4期82-84,88,共4页Journal of Northeast Forestry University

基　　金：中央高校基本科研专项资金(DL12BB18);国家自然科学基金(31300474);林业公益性行业科研专项重大项目(201104007)

摘　　要：利用应力波设备,分别对完好和含有不同大小空洞缺陷的大青杨径切板材样本进行了测试,分析了空洞对应力波传播时间的影响,探讨了含空洞木材中应力波的传播路径。结果表明:空洞对木材中应力波传播有显著影响;当应力波在木材中传播遇到空洞缺陷时,其传播路径会发生改变,会绕着空洞缺陷,沿空洞周围的木材进行传播。这导致应力波传播距离延长,传播时间增加。Stress wave dewce was employed to test Populus ussunensis quarter-sawn board samples, intact and detective samples with different size cavities, respectively. We analyzed the effect of cavity on stress wave propagation time, and discussed the stress wave propagation path in wood with defects. The cavity has a significant effect on the propagation of stress wave in wood. When the stress wave arrives at the edge of cavity, its path will he changed and it seems to travel through the wood along the cavity, which leads to the extension of propagation distance and the increase of the propagation time.

关 键 词：木材 应力波 无损检测 空洞 传播路径 

分 类 号：S781[农业科学—木材科学与技术]