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

Olmedo, Ignacio; Bourrier, Franck; Bertrand, D.; Toe, David; Berger, Frédéric; Limam, A.

doi:10.1007/s00226-015-0713-0

Cited by 13 publications

(12 citation statements)

References 15 publications

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“…However, it cannot be directly used for quantitative risk assessment because of the simplified modeling of the rocktree and rock-stump interactions. Improvements of the model are currently underway both for developing detailed mechanical modeling of rock-stem interactions (Bertrand et al, 2013;Bourrier et al, 2013) and for rock impact experiments in the laboratory for calibration purposes (Olmedo et al, 2015).…”

Section: Protective Function Of Mature Forestsmentioning

confidence: 99%

Protection against rockfall along a maturity gradient in mountain forests

Fuhr

Bourrier

Cordonnier

2015

Forest Ecology and Management

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Section: Protective Function Of Mature Forestsmentioning

confidence: 99%

Protection against rockfall along a maturity gradient in mountain forests

Fuhr

Bourrier

Cordonnier

2015

Forest Ecology and Management

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“…Each stem was impacted twice, at two different impact energy levels. Additional details on the experimental set-up can be found in Olmedo et al (2015).…”

Section: Impact Experimentsmentioning

confidence: 99%

“…The model calibration was based on experimental results from Olmedo et al (2015). The stems were modeled by deformable cylinders and the time evolution of the measured impact force was imposed at mid-span.…”

Section: Calibration Proceduresmentioning

confidence: 99%

“…The experimental data from Olmedo et al (2015) allowed adjusting the parameters of the stem model. The simulations consisted in impacting at mid-span a simply supported stem, represented by a cylinder, with a spherical discrete element, representing the pendulum.…”

Section: Calibration Proceduresmentioning

confidence: 99%

“…Recent experimental laboratory studies enabled to characterize the dynamic response of small stems (up to 10 cm of diameter) to impacts (Bertrand, Bourrier, Olmedo, Brun, Berger, & Limam, 2013;Olmedo, Bourrier, Bertrand, Toe, Berger, & Limam, 2015) with the final aim of understanding the response of wooden protection structures to a block impact. A first Discrete Element Method (DEM) based model (Olmedo, Bourrier, Bertrand, Berger, & Limam, 2016) of the stems response to impact loading was also proposed and allowed describing the dynamic response of the stems tested in the laboratory.…”

Section: Introductionmentioning

confidence: 99%

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Dynamic analysis of wooden rockfall protection structures subjected to impact loading using a discrete element model

Olmedo¹,

Bourrier²,

Bertrand

et al. 2018

European Journal of Environmental and Civil Engineering

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Wooden structures made of felled trees are used in forested slopes as protection structures against rockfall. A model based on the Discrete Element Method is developed to analyse their response to normal impacts of blocks. The interaction between the blocks and the stems and the stem response are explicitly integrated. After the model calibration using impact tests, a wide range of impact scenarii representative of real configurations is explored. The influence of three parameters (stem diameter, impact velocity and block diameter) is analysed.Three impact types were identified for different ratios RD between the block and stem diameters. For small RD , the impact is limited to a brief contact. For intermediate RD, successive contacts of similar duration are observed. After the last contact, the block is sent back with a large velocity. For large RD, two contacts are observed. The second contact can be assimilated to a quasi-static loading of the stem. In addition, structure damage increases for increasing RD ranging from almost no damage for the first impact type to rupture of the stem for the third type. The largest RD associated with the first impact type is the target configuration that favors block energy decrease and limits structure damage.

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Effects of species and moisture content on the behaviour of solid wood under impact

Hassan Vand,

Tippner,

Brabec

2023

Eur. J. Wood Prod.

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The article's main aim is to assess the effects of species and moisture content (MC) on the behaviour of solid wood material under the low velocity of impact and present a pattern for predicting loading vs time curves for these species in different moisture levels. Three groups of samples (300 × 20 × 20 mm) were made from beech, oak, and spruce wood. Each group was subdivided into two groups with low moisture content (LMC) level (10–12%) and high moisture content (HMC) level (40–60%). A drop-weight impact machine did the tests, and high-speed cameras recorded the lateral specimens' surface during the impact. The digital image correlation technique (DIC) determined the strain pattern and the deflection. The timing of the crack initiation was also observed. Also, the force–time charts, the maximum force required for crack initiation, the work needed for crack initiation, and the total work required for the breakage of every specimen were gathered. A general force–time pattern with five identifiable steps was determined for each group. It turned out that the maximum deflection and longitudinal tensile strain of the beams up to crack initiation increase with increased moisture content while maximum force decreases. Unlike beech, the required work for rupture of HMC samples of oak and spruce is higher than LMC group.

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

Cited by 13 publications

References 15 publications

Protection against rockfall along a maturity gradient in mountain forests

Protection against rockfall along a maturity gradient in mountain forests

Dynamic analysis of wooden rockfall protection structures subjected to impact loading using a discrete element model

Effects of species and moisture content on the behaviour of solid wood under impact

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