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Title: Stress Wave Propagation in Larch Plantation Trees-Numerical Simulation

Source: USDA Forest Service, Forest Products Laboratory, General Technical Report, FPL-GTR-239, 2015; pp. 418-427.

Author(s)Liu, Fenglu; Jiang, Fang; Wang, Xiping; Zhang, Houjiang; Yu, Wenhua

Publication Year: 2015  View PDF »

Category: General Technical Reports
Associated Research Project(s):   FPL-4714-1B

Abstract: In this paper, we attempted to simulate stress wave propagation in virtual tree trunks and construct two dimensional (2D) wave-front maps in the longitudinal-radial section of the trunk. A tree trunk was modeled as an orthotropic cylinder in which wood properties along the fiber and in each of the two perpendicular directions were different. We used the COMSOL Multiphysics® software to conduct numerical simulations. Field stress wave timing measurements were then conducted on three freshly cut larch (Larix principis-rupprechtii Mayr) logs to validate the simulation results. The 2D wave fronts observed through numerical simulations were in good agreement with those obtained through stress wave timing measurements. When a stress wave was introduced into the tree trunk through a point impact, it initially propagated in the impact direction with a spherical wave front; then the flow of stress wave energy gradually changed toward the longitudinal direction and its wave front became flattened perpendicular to the longitudinal axis. Our preliminary results indicate that the Structural Mechanics module of the COMSOL Multiphysics® software is capable of simulating the longitudinal wave propagation in standing trees.

Keywords: International Nondestructive Testing and Evaluation of Wood Symposium; nondestructive testing; nondestructive evaluation; wood; wood products

Publication Review Process: Informally Refereed (Peer-Reviewed)

File size: 859 kb(s)

Date posted: 09/25/2015

This publication is also viewable on Treesearch:  view
RITS Product ID: 75513
Current FPL Scientist associated with this product
Wang, Xiping
Research Forest Products Technologist
  

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