Static bending properties of Finnish birch wood

Heräjärvi, Henrik

doi:10.1007/s00226-003-0209-1

Cited by 26 publications

(26 citation statements)

References 4 publications

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“…The juvenile wood is explained by short f iber length, low wood density and low mechanical strength properties than mature wood. These results have reported by several researchers (Heräjärvi, 2004;Alteyrac et al, 2006;Kord et al, 2010;Izekor and Fuwape, 2011;Ferreira et al, 2011;Naji et al, 2012). There are positive relationships between fiber length and burst strength (Casey 1952;Miyake 1968;ElHosseiny and Anderson 1999;Ona et al 2001), tensile strength (Casey 1952, Miyake 1968, tear strength (Casey 1952;Haygreen and Bowyer 1996) and folding endurance (Dinwoodie 1965;Ona et al 2001).…”

Section: Resultssupporting

confidence: 74%

“…The relationship between wood density and modulus of elasticity (R 2 = 0.90) is stronger than the relationship between wood density and modulus of rupture (R 2 = 0.81). The dependences of MOE and MOR on to wood density were previously reported by several researchers (Zhang, 1997;Heräjärvi, 2004;Kiaei, 2011) for some of softwood and hardwood species. The correlation coefficients between wood basic density with MOE and MOR for Iranian persimmon wood were determined 0.90 and 0.81, respectively.…”

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confidence: 71%

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Radial variations of wood different properties in Diospyros lotus

Kiaei

Bakhshi

2014

For. syst.

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Aim of study: The aim of this study was to determine some of the physical, biometry and mechanical strength properties of Diospyros lotus L. wood along radial direction from the pith to the bark and the relationship between wood various properties.Area of study: The study area is located in north Iran in the province of Mazandarn. Material and methods:Testing samples were taken at breast height of tree stem and three radial position of stem radius to determine physical (basic density), fiber biometry (fiber length, fiber diameter, cell-wall thickness) and mechanical properties (modulus of rupture and modulus of elasticity).Main results: The results of ANOVA indicated that there are significant differences along radial direction in above mentioned properties for persimmon wood. Basic density, fiber length, fiber diameter, cell-wall thickness, modulus of elasticity and modulus of rupture increased along radial direction from pith toward the bark.Research highlights: The persimmon wood isn't suitable for pulp and paper production due to the unfavorable flexibility and Runkel coefficients.

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Section: Resultssupporting

confidence: 74%

supporting

confidence: 71%

Radial variations of wood different properties in Diospyros lotus

Kiaei

Bakhshi

2014

For. syst.

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“…Thus, bending performance can be analyzed by constructing a static bending test. Two main properties can be obtained from the test, namely, modulus of rupture (MOR) and modulus of elasticity (MOE) [17][18][19][20][21]. These two properties can be easily understood by referring to typical load-deflection curve ( Fig.…”

Section: Bending Performancementioning

confidence: 99%

Light Organic Solvent Preservative Behavior on Bending Strength of Mengkulang (Heritiera spp.) Glulam

Mokhtarruddin¹,

Ahmad²,

Hassan³

et al. 2016

InCIEC 2015

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The purpose of this study was to determine the behavior of LOSP on the bending strength of glulam manufactured using Malaysian tropical timber namely Mengkulang. Timber preservatives are used to prevent from degradation which can be due to some extend weathering, fungi, or insects. Therefore, the use of quality preservatives is essential in determining the performance of timber under such conditions. An experiment was carried out to determine the effect of using preservative to the performance of Mengkulang (Heritiera spp.) glued laminated timber (glulam) treated using light organic solvent preservative (LOSP). LOSP was chosen due to its more environmental friendly chemical ingredient. Ten specimens of Mengkulang manufactured at a factory in Selangor, Malaysia which followed the Malaysian Standard, MS 758 were divided into one group of five timber beams treated with LOSP prior to gluing and another group of five untreated timber beams. This paper only reported the effect of LOSP on the bending strength properties. The static bending test under four-point loading was carried out based on American Standard for Testing and Material, ASTM D 198. The results showed that LOSP-treated Mengkulang glulam had higher values of modulus of rupture (MOR) and modulus of elasticity (MOE) compared with untreated Mengkulang glulam by 4 % and 6 %, respectively. Since most researches have so far focused on temperate softwood species, the findings of this study are significant as the specimens were from tropical timber species and the study employed experimental

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“…For plywood production, logs with no stem defects such as crooks, forking, and with knots as few as possible are required (Donaldson and Turner 2001;Heräjärvi 2001). For silver birch, growth traits have been reported to be mostly under strong genetic control (Stener and Hedenberg 2003;Stener and Jansson 2005), yet rapid growth not having strong negative effect on wood and stem properties (Dunham et al 1999;Heräjärvi 2001;Heräjärvi 2004a and2004b;Baliuckienė and Baliuckas 2006). In Scandinavia, heritability for growth traits found to vary considerably from 0.07 to 0.56 up to the age of 10 years, largely depending on planting site (Stener and Jansson 2005;Skrøppa and Solvin 2019).…”

Section: Introductionmentioning

confidence: 99%

Genetic parameters of growth and quality traits in open-pollinated silver birch progeny tests

Gailis¹,

Zeltiņš²,

Purviņš³

et al. 2020

Silva Fenn.

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Genetic parameters of growth and stem quality traits were estimated for open-pollinated silver birch Roth progenies in Latvia at the age of 10 and 14 years. Tree height and stem volume were found to be under strong genetic control at both inventories (narrow-sense heritabilities varied from 0.41 to 0.66). Mainly low heritabilities were found for stem defects, yet genetic control of branch diameter, stem straightness and overall stem quality varied from low to high depending on study site. High additive genetic coefficient of variation was found for stem volume (25.3â32.5%). Genetic correlations among growth traits were strong and positive (0.90â0.99). Mainly weak genetic correlations between growth and quality traits implied simultaneous improvement. Still, strong negative correlations between branch angle and stem straightness might result in enlarged knot size for straighter logs. The genetic age-age correlations were strong. Weak genotype by environment interaction and stability of best genotypes over different sites was indicated by strong genetic correlations between trials. Each growth or quality trait alone showed substantial improvement in terms of estimated genetic gain (up to 62% over trial mean for stem volume). Therefore, selection index combining both growth and stem quality may be developed.Betula pendula

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Static bending properties of Finnish birch wood

Cited by 26 publications

References 4 publications

Radial variations of wood different properties in Diospyros lotus

Radial variations of wood different properties in Diospyros lotus

Light Organic Solvent Preservative Behavior on Bending Strength of Mengkulang (Heritiera spp.) Glulam

Genetic parameters of growth and quality traits in open-pollinated silver birch progeny tests

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