Experimental analysis of the response of fresh wood stems subjected to localized impact loading

The forest is a well known and efficient natural protection solution against rockfall. To compensate for a loss of the forest’s protective function after windstorms or maintenance tasks, some of the felled trees can be left in an oblique position on the slope as wooden protection structures. No stud...

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Veröffentlicht in:Wood science and technology 2015-05, Vol.49 (3), p.623-646
Hauptverfasser: Olmedo, I, Bourrier, F, Bertrand, D, Toe, D, Berger, F, Limam, A
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container_end_page 646
container_issue 3
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container_title Wood science and technology
container_volume 49
creator Olmedo, I
Bourrier, F
Bertrand, D
Toe, D
Berger, F
Limam, A
description The forest is a well known and efficient natural protection solution against rockfall. To compensate for a loss of the forest’s protective function after windstorms or maintenance tasks, some of the felled trees can be left in an oblique position on the slope as wooden protection structures. No studies have been conducted on the efficacy of these devices and particularly their resistance to rock impacts and their energy dissipation capacity. The dynamic response of fresh stems to impact was analyzed by laboratory impact experiments with a Mouton-Charpy pendulum. The experimental results allowed the definition of different impact types related to the occurrence of nonlinear processes associated with partial rupture of wood fibers. The physics controlling the stem loading force and displacement were shown to be mainly associated with inertial effects during the early stages of the impact. Second, when the stem displacements become larger, the stem response becomes quasi-static. Based on these results, a practical approach for assessing the capacity of wooden structures made of fallen trees to resist rock impact was proposed and evaluated.
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To compensate for a loss of the forest’s protective function after windstorms or maintenance tasks, some of the felled trees can be left in an oblique position on the slope as wooden protection structures. No studies have been conducted on the efficacy of these devices and particularly their resistance to rock impacts and their energy dissipation capacity. The dynamic response of fresh stems to impact was analyzed by laboratory impact experiments with a Mouton-Charpy pendulum. The experimental results allowed the definition of different impact types related to the occurrence of nonlinear processes associated with partial rupture of wood fibers. The physics controlling the stem loading force and displacement were shown to be mainly associated with inertial effects during the early stages of the impact. Second, when the stem displacements become larger, the stem response becomes quasi-static. 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To compensate for a loss of the forest’s protective function after windstorms or maintenance tasks, some of the felled trees can be left in an oblique position on the slope as wooden protection structures. No studies have been conducted on the efficacy of these devices and particularly their resistance to rock impacts and their energy dissipation capacity. The dynamic response of fresh stems to impact was analyzed by laboratory impact experiments with a Mouton-Charpy pendulum. The experimental results allowed the definition of different impact types related to the occurrence of nonlinear processes associated with partial rupture of wood fibers. The physics controlling the stem loading force and displacement were shown to be mainly associated with inertial effects during the early stages of the impact. Second, when the stem displacements become larger, the stem response becomes quasi-static. 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subjects Biomedical and Life Sciences
Ceramics
Civil Engineering
Composites
Dynamic response
Dynamique, vibrations
energy
Energy dissipation
Engineering Sciences
Fibers
Forests
Glass
Impact analysis
Impact loads
Impact resistance
Impact strength
Life Sciences
Machines
Manufacturing
Natural Materials
Original
Pendulums
Processes
Risques
Rockfall
Rocks
Stems
Structures
Trees
Wood
Wood fibers
Wood Science & Technology
Wooden structures
title Experimental analysis of the response of fresh wood stems subjected to localized impact loading
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