文献类型：期刊文献

英文题名：Numerical Simulation of Stress Wave Propagation in the Three-Layer Medium Structure of Standing Trees

作者：Gong, Yingchun[1,2] Qu, Jialei[1] Ren, Haiqing[1,2] Chen, Shubing[3] Liu, Fenglu[4]

第一作者：Gong, Yingchun;龚迎春

通信作者：Ren, HQ[1];Ren, HQ[2];Liu, FL[3]

机构：[1]Chinese Acad Forestry, Res Inst Wood Ind, Beijing 100091, Peoples R China;[2]Collaborat Innovat Ctr Efficient Proc & Utilizat F, Nanjing 210037, Jiangsu, Peoples R China;[3]China Acad Bldg Res, Beijing 100032, Peoples R China;[4]Fujian Agr & Forestry Univ, Coll Mech & Elect Engn, Fuzhou 350001, Fujian, Peoples R China

年份：2025

卷号：20

期号：4

起止页码：8456-8472

外文期刊名：BIORESOURCES

收录：;EI(收录号：20253419009630);Scopus(收录号：2-s2.0-105013167122);WOS:【SCI-EXPANDED(收录号:WOS:001552505700006)】；

基金：This study was carried out with the support of Scientific and Technological Innovation 2030-Major Project "Properties and Quality Evaluation of Pine Wood for Pulp and Structural Materials" (grant number 2023ZD0405905) , the National Natural Science Foundation of China (No. 32301515) and Central Financial Forest and Grass Technology Promotion Demonstration Project "Promotion and demonstration of key technologies for the production of cross laminated timber from typical tree species in daxing'anling region" (Daxing'anling Group [2024] TG 003) .

语种：英文

外文关键词：Standing free; Stress wave propagation; Numerical simulation; Three-layer medium structure

摘要：Based on the theory of stress wave propagation in solid media, this paper conceptualizes standing trees as a three-layer composite material comprising the pith, heartwood, and sapwood. Assuming that standing trees exhibit orthotropic anisotropy, the propagation process of stress waves within the trees is simulated and analyzed using the finite element simulation software. The paper investigates the effects of diameter at breast height (DBH) of 40-year-old standing larch trees and the proportional composition of pith, heartwood, and sapwood on the propagation of stress waves. The results reveal that, despite variations in DBH and the relative proportions of the three components, the overall propagation patterns of stress waves remain largely consistent across models. Initially, stress waves propagate in the form of an inclined curved surface. As the propagation distance increases, the inclination of the wavefront gradually decreases, eventually approaching a plane perpendicular to the longitudinal axis of the standing tree. When the DBH increases from 30 cm to 50 cm, the stress wave velocity rises significantly from 3,450 m/s to 3,620 m/s. Additionally, as the proportion of sapwood increases, the velocity increases from 3,529 m/s to 3,916 m/s. A strong correlation is observed between wave velocity and the compositional ratio of the three components, with a correlation coefficient (R2) of 0.98.