Elastic constants of green Pinus radiata wood

Davies, Nicholas T.; Altaner, Clemens M.; Apiolaza, Luis A.

doi:10.1186/s40490-016-0075-x

Cited by 11 publications

(4 citation statements)

References 20 publications

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“…In general, no significant variation patterns were found in these five Poisson's ratios. Davies et al estimated six Poisson's ratios both in outerwood and corewood from green Pinus radiata and no significant difference between outerwood and corewood was found [32]. Therefore, we still do not understand the variation patterns of the Poisson's ratios along wood cross-sections, and few researchers have evaluated the variation in the Poisson's ratios along the whole cross-section of dry or green wood.…”

Section: Poisson's Ratiomentioning

confidence: 97%

“…This would lead to a poor representation when the elastic constants of dry wood are used for modelling standing trees or green logs. Only Davies et al investigated and obtained the elastic constants of green Pinus radiata wood using compression and tension tests [32]. Davies et al stated that the mathematical modelling would be more realistic with the material constants of green wood rather than those of dry wood.…”

Section: Introductionmentioning

confidence: 99%

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Variations in Orthotropic Elastic Constants of Green Chinese Larch from Pith to Sapwood

Liu

Zhang

Jiang

et al. 2019

Forests

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Full sets of elastic constants of green Chinese larch (Larix principis-rupprechtii Mayr) with 95% moisture content at four different cross-section sampling positions (from pith to sapwood) were determined in this work using three-point bending and compression tests. Variations in the material constants of green Chinese larch from pith to sapwood were investigated and analyzed. The results showed that the sensitivity of each elastic constant to the sampling position was different, and the coefficient of variation ranged from 4.3% to 48.7%. The Poisson’s ratios νRT measured at four different sampling positions were similar and the differences between them were not significant. The coefficient of variation for Poisson’s ratio νRT was only 4.3%. The four sampling positions had similar Poisson’s ratios νTL, though the coefficient of variation was 11.7%. The Poisson’s ratio νLT had the greatest variation in all elastic constants with a 48.7% coefficient of variation. A good linear relationship was observed between the longitudinal modulus of elastic EL, shear modulus of elasticity GRT, Poisson’s ratio νRT, and sampling distance. EL, GRT, and νRT all increased with sampling distance R. However, a quadratic relationship existed with the tangential modulus of elasticity ET, radial modulus of elasticity ER, shear modulus of elasticity GLT, and shear modulus of elasticity GLR. A discrete relationship was found in the other five Poisson’s ratios. The results of this study provide the factual changes in the elastic constants of green wood from pith to sapwood for numerical modelling of stress wave propagation in trees or logs.

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Section: Poisson's Ratiomentioning

confidence: 97%

Section: Introductionmentioning

confidence: 99%

Variations in Orthotropic Elastic Constants of Green Chinese Larch from Pith to Sapwood

Liu

Zhang

Jiang

et al. 2019

Forests

View full text Add to dashboard Cite

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“…Pfeifer (1982) said "morphological differences in shoot development and "sail area" are much greater and are therefore likely to have a more significant effect on stability" than root/shoot ratios. For planted South Reforesta Scientific Society 88 pines, the risk of toppling can be reduced by pruning branches before high wind events (Aimers-Halliday et al 1999;Davies-Colley and Turner 2001). When toppling is positively related to seedling height, sail area will be related to toppling.…”

Section: Sail Areamentioning

confidence: 99%

Questions about toppling of pine seedlings

South

2022

REFOR

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When soil is moist and wind is at a gale force, the term used to describe blow down of old trees is windthrow. In contrast, toppling is a term used when planted pines lean more than 15° during the first decade after transplanting. Pines tend to topple more than other conifers and fast-growing species topple more than slow growing genotypes. Large areas of pine plantations have toppled before age 8 years. This paper describes some toppling events that have occurred in 18 countries and includes 16 questions about toppling.

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“…Orthotropic material properties are represented with three Young's modulus, three shear modulus and six Poisson's ratios (Bodig and Jayne, 1993). The elastic constants of wellknown wood species can be found in Dinwoodie, 2000;Kretschmann, 2010;Ozyhar et al, 2013;Aira et al, 2014;Davies et al, 2016. In general, the two most influencing physical parameters that may affect the elastic properties are specific gravity and moisture content. Elastic properties also vary between and within species (Kretschmann, 2010).…”

Section: Introductionmentioning

confidence: 99%

Determination of elastic constants for scots pine wood using ultrasound

GÜNTEKİN

2023

Turkish Journal of Forestry | Türkiye Ormancılık Dergisi

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Elastic constants of Scots pine (Pinus sylvestris L.) wood grown in Turkey were investigated using non-destructive ultrasound tests. Elastic modulus in longitudinal and perpendicular directions (EL, ER, ET), shear modulus in principal planes (GLR, GLT, GRT) and Poisson ratios (ʋLR, ʋRL ʋLT, ʋLT, ʋRT, ʋTR) were calculated using cubic samples (20 mm) which were conditioned at 65 % relative humidity and 21 °C. Longitudinal and transverse ultrasonic sound velocities in fiber (L), radial (R) and tangential (T) directions were measured using 2.25 MHz and 1 MHz sensors, respectively. Transverse sound wave velocities at an angle of 45° to the L, R and T directions were also measured with a 1 MHz sensor in order to calculate the Poisson ratios. The predicted elastic modulus based on ultrasound in L, R, T directions were 10600, 1300 and 470 N/mm2, respectively. The predicted shear modulus based on ultrasound in LR, LT, RT planes were 1180, 1050 and 350 N/mm2, respectively. Poisson ratios varied between 0.04 to 0.95. Comparing the data available in the literature, elastic constants of scots pine determined using ultrasonic method were within the acceptable values.

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Elastic constants of green Pinus radiata wood

Cited by 11 publications

References 20 publications

Variations in Orthotropic Elastic Constants of Green Chinese Larch from Pith to Sapwood

Variations in Orthotropic Elastic Constants of Green Chinese Larch from Pith to Sapwood

Questions about toppling of pine seedlings

Determination of elastic constants for scots pine wood using ultrasound

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