Bending properties of dimension lumber produced from Siberian larch (Larix sibirica) in Mongolia

Tumenjargal, Bayasaa; Ishiguri, Futoshi; Takahashi, Yusuke; Nezu, Ikumi; Baasan, Bayartsetseg; Aiso-Sanada, Haruna; Ohshima, Jyunichi; Yokota, Shinso

doi:10.1186/s10086-020-01863-6

Cited by 10 publications

(14 citation statements)

References 20 publications

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“…These results suggest that high bending properties can be obtained in lumber classified into higher visual grading classes. On the other hand, Tumenjargal et al [13] reported that no significant differences in either the MOE or MOR of 2 by 4 (38 × 89 mm) lumber in L. sibirica were found between SS, No. 1, No.…”

Section: Introductionmentioning

confidence: 95%

“…2 grade in visual grading) for 2 by 6, 2 by 8, 2 by 10, and 2 by 12 cross sections. Recently, Tumenjargal et al [13] reported that f 0.05 values of MOE and MOR in 2 by 4 (38 × 89 mm) lumber of L. sibirica grown in Mongolia were 5.70 GPa and 15.1 MPa, respectively. However, available information on f 0.05 for the MOE and MOR of dimension lumber for structural use remain limited for common softwoods in Mongolia.…”

Section: Introductionmentioning

confidence: 99%

“…Mechanical properties of structural lumber, such as dimension lumber, have been investigated for softwood species by many researchers [3][4][5][6][7][8][9][10][11][12][13]. In terms of mechanical properties, the 5% lower tolerance limit with a 75% confidence level (f 0.05 ) in modulus of elasticity (MOE) and modulus of rupture (MOR) is important information for utilization of wood as structural material [14][15][16][17].…”

Section: Introductionmentioning

confidence: 99%

“…Effects of sawing pattern on mechanical properties of softwood lumber have been investigated for efficient lumber production [12,13,16,23,24]. In general, lower mechanical properties and instability of structural lumber are caused by the presence of juvenile wood with high microfibril angle [11,16,23].…”

Section: Introductionmentioning

confidence: 99%

“…Furthermore, correlations among the different markers of lumber quality in each species were discussed. This is the first report on the evaluation of quality of dimension lumber in four common softwoods naturally grown in Mongolia, except for L. sibirica [12,13].…”

Section: Introductionmentioning

confidence: 99%

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Preliminary evaluation for quality of dimension lumber in four common softwoods in Mongolia

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The quality of dimension lumber (2 by 4 lumber) was preliminarily investigated in four common Mongolian softwoods: Pinus sylvestris L., Pinus sibirica Du Tour, Picea obovata Ledeb., and Larix sibirica Ledeb. to produce high quality dimension lumber for structural use. In total 61, 39, 67, and 37 pieces of lumber were prepared for Pinus sylvestris, Pinus sibirica, Picea obovata, and L. sibirica, respectively. The lumber was visually graded and then tested in static bending to obtain the 5% lower tolerance limits at 75% confidence level (f0.05) of the modulus of elasticity (MOE) and the modulus of rupture (MOR). In addition, the effects of sawing patterns on bending properties were also analyzed. The f0.05 of the MOE and MOR were 4.75 GPa and 15.6 MPa, 3.39 GPa and 11.0 MPa, 3.78 GPa and 11.7 MPa, and 6.07 GPa and 22.3 MPa for Pinus sylvestris, Pinus sibirica, Picea obovata, and L. sibirica, respectively. These results suggested that with a few exceptions, characteristic values of MOR in the four common Mongolian softwoods resembled those in similar commercial species already used. In visual grading, over 80% of total lumber was assigned to select structural and No. 1 grades in Pinus sylvestris and Pinus sibirica, whereas approximately 40% of total lumber in L. sibirica was No. 3 and out of grades. Sawing patterns affected bending properties in Pinus sylvestris and L. sibirica, but did not affect Pinus sibirica and Picea obovata. Dynamic Young's modulus was significantly correlated with bending properties of dimension lumber for the four species. Based on the results, it was concluded that dimension lumber for structural use can be produced from the four common Mongolian softwoods.

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Section: Introductionmentioning

confidence: 95%

Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

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Preliminary evaluation for quality of dimension lumber in four common softwoods in Mongolia

et al. 2020

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Size effects on the bending strength of Chinese larch pine laminated veneer lumber

He²,

Li³

2023

Eur. J. Wood Prod.

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Physical and mechanical properties of wood and their geographic variations in Larix sibirica trees naturally grown in Mongolia

Tumenjargal

Ishiguri

Aiso³

et al. 2020

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We examined the physical and mechanical properties of wood in Siberian larch (Larix sibirica) trees that grow naturally in five Mongolian provenances (Khentii, Arkhangai, Zavkhan, Khuvsgul, and Selenge) and the geographic variations between them. Five trees with stem diameters of 20 to 30 cm at 1.3 m above ground were collected from each provenance. The mean values of the modulus of elasticity (MOE), modulus of rupture (MOR), compressive strength parallel to grain (CS), and shearing strength (SS) ranged from 7.03 to 9.51 GPa, 79.8 to 103.9 MPa, 46.3 to 51.1 MPa, and 10.4 to 13.0 MPa, respectively. Significant differences were found in radial and tangential shrinkage, MOE, MOR, and SS in wood among the five provenances. In addition, juvenile wood had inferior physical and mechanical properties in comparison to mature wood within and among provenances. Furthermore, there were significant differences in all examined properties, except for CS, in mature wood among the five provenances. Higher correlation coefficients were also obtained in mature wood among all mechanical properties, except for SS. Larix species are one of the most productive forestry species in North America 1-4 , Europe 5-12 , Japan 13-24 , and China 25,26. To date, several studies have focused on geographic variations in the physical and mechanical properties of wood in Larix species to determine effective wood utilization and conduct appropriate tree breeding programs 1,3-5,15,18,19,23,24. For example, geographic variations have been found in the physical and mechanical properties of wood in Larix kaempferi 1,4. A similar tendency was also found for another Larix species, Larix sibirica 5. In addition to geographic and/or genetic variations in the physical and mechanical properties of wood, radial variations should also be considered for effective wood utilization 11,12,23-25,27. In general, softwood can be classified as juvenile or mature wood. Juvenile wood is characterized by a greater microfibril angle, a lower basic density, and inferior mechanical properties compared to mature wood 12-15,17,23,24,26,28,29. In a study of 31-year-old L. kaempferi trees, wood density and wood mechanical properties, such as modulus of elasticity (MOE), modulus of rupture (MOR), compressive strength parallel to grain (CS), and shearing strength (SS), showed lower values in corewood (from the pith to the 15th annual ring) than in outer wood (from the 15th annual ring to the bark) 24. Therefore, based on the nature of Larix species, (1) trees of these species with superior physical and mechanical properties of wood can be selected, and (2) the properties of juvenile wood should be considered for determining effective wood utilization. In Mongolia, the total forest area is 18.3 million ha, covering 11.9% of the country 30. Of this total area, Larix sibirica covers more than 70% of the forest. Since wood produced from Larix species is mainly utilized for structural applications, sawmilling is one of the main forest activities in Mongolia. Indeed, L. sibirica is the m...

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Bending properties of dimension lumber produced from Siberian larch (Larix sibirica) in Mongolia

Cited by 10 publications

References 20 publications

Preliminary evaluation for quality of dimension lumber in four common softwoods in Mongolia

Preliminary evaluation for quality of dimension lumber in four common softwoods in Mongolia

Size effects on the bending strength of Chinese larch pine laminated veneer lumber

Physical and mechanical properties of wood and their geographic variations in Larix sibirica trees naturally grown in Mongolia

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