文献类型：期刊文献

英文题名：Various Factors and Propagation Trends of Stress Waves in Cross Sections of Euphrates Poplar

作者：Liang, Shanqing[1] Fu, Feng[1] Lin, Lanying[1] Hu, Nana[1]

第一作者：梁善庆

通信作者：Liang, SQ[1]

机构：[1]Chinese Acad Forestry, Res Inst Wood Ind, Beijing, Peoples R China

年份：2010

卷号：60

期号：5

起止页码：440-446

外文期刊名：FOREST PRODUCTS JOURNAL

收录：;EI(收录号：20110513628791);Scopus(收录号：2-s2.0-79251523195);WOS:【SCI-EXPANDED(收录号:WOS:000286080900005)】；

基金：This study was supported by the Wood-Inorganic Restoration Material Project from Technique Introduction and Innovation of Bio-Macromolecule New Material of Introducing Overseas Advanced Forest Technology Important Program of China (2006-4-C03). We are grateful for and acknowledge the financial support. We also greatly appreciate Mr. James H. Muehl for his comprehensive review and suggestions for enhancing this paper.

语种：英文

外文关键词：Decay (organic) - Elastic waves - Forestry - Interpolation - Underwater acoustics - Velocity - Wave propagation - Wavefronts - Wood

摘要：Various factors and propagation trends of stress waves in cross sections of wood need study to improve accuracy in the quality evaluation of wood and decay detection in standing trees. In this study, a Fakopp Microsecond Timer was used to measure the stress wave transmission time of Euphrates poplar (Populus euphratica Oliv.). Velocity was calculated to find the trend and make wavefront maps of stress waves. Results indicated that stress waves travel fastest in the radial direction and that velocity decreased as the angle between the two sensors increased. Velocity also increased as the number of annual rings increased. At the same time, the velocity in normal wood was higher than it was in tension wood, and it gradually increased in normal wood as the radial distance increased from pith to bark. Different influences on the stress wave propagation in wood were found when holes were made in the center of a cross section. Velocity showed little change with the increase in hole diameter when the angle between impacting and receiving sensors was 90 degrees. At 180 degrees, velocity was affected by hole diameter and rapidly decreased. Successful simulated wavefront maps of stress waves in cross sections of sound, hole, crack, and decay wood using two-dimensional contours were made. Three-dimensional maps were also reconstructed using Kriging interpolation and showed high similarity between cross sections.