Radial variation in partial compression properties perpendicular to the grain of Japanese larch (Larix kaempferi)

Ishikura, Yukiko; Matsumoto, Kazushige; Ohashi, Yoshinori

doi:10.1007/s10086-012-1273-7

Cited by 4 publications

(5 citation statements)

References 12 publications

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“…Our results obtained in sugi are consistent with previous results obtained in sugi [3] and Norway spruce [27]; however, results contrary to our results were obtained in Japanese larch [24] and loblolly pine [28]. Wood densities in Japanese larch and most hard pines were low values near the tree center with an increase toward the bark [24,29]. In contrast, the density of sugi and Norway spruce showed high values at the tree center, dropping through the juvenile wood zone, and then rising slightly in a radial pattern [4,30].…”

Section: Discussionsupporting

confidence: 90%

“…4, specimens with pith and specimens containing ring numbers 1-5 had significantly larger σ e5% values than specimens without pith and specimens with outer rings, respectively. Our results obtained in sugi are consistent with previous results obtained in sugi [3] and Norway spruce [27]; however, results contrary to our results were obtained in Japanese larch [24] and loblolly pine [28]. Wood densities in Japanese larch and most hard pines were low values near the tree center with an increase toward the bark [24,29].…”

Section: Discussionsupporting

confidence: 88%

“…Therefore, based only on sugi data, it might be difficult to evaluate the effect of MFA on σ e5% separately from the effects of density. The specimens near the pith in Japanese larch and loblolly pine did not have superior σ e [24,28], although larger MFAs near the pith were expected. To evaluate the effect of MFA on σ e5% more accurately, we should examine the effects of MFA on σ e5% in the species with different wood properties from sugi wood.…”

Section: Discussionmentioning

confidence: 88%

“…As the reason for the larger σ e5% under loading in the tangential direction, it was considered that vertically lined latewood protected the weak earlywood from being crushed [5]. In the Japanese larch (Larix kaempferi), the σ e with loading in the tangential direction increased with density; however, the σ e with loading in the radial direction did not correlate with density [24]. In Picea spp.…”

Section: Discussionmentioning

confidence: 99%

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Partial compression strength of sugi (Japanese cedar, Cryptomeria japonica) wood near the pith perpendicular to the grain

et al. 2019

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It was reported that sugi (Japanese cedar, Cryptomeria japonica) boards with pith had a greater partial compression strength perpendicular to the grain (σ e) than sugi boards without pith. However, the reason for the superior strength of sugi boards with pith remains unclear. In this study, as the first step to elucidate the reason, we report the effects of loading direction (tangential and radial), density, microfibril angle (MFA) of earlywood and latewood tracheids, latewood tracheid length and cross-sectional parameters of earlywood tracheids (CE) on σ e in sugi wood. There was no significant effect of loading direction on σ e , and the specimens with pith had significantly larger σ e values than the specimens without pith. A larger density, larger MFA, and smaller cross-sectional dimensions with a square shape in earlywood tracheids significantly increased σ e in the radial loading direction. By multiple linear regression, it was recognized that density and MFA was the effective parameters, and MFA had a larger effect than did density in the predictor equation for σ e. This is the first study that reported the positive effects of MFA on σ e in sugi wood.

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Section: Discussionsupporting

confidence: 90%

Section: Discussionsupporting

confidence: 88%

Section: Discussionmentioning

confidence: 88%

Section: Discussionmentioning

confidence: 99%

See 2 more Smart Citations

Partial compression strength of sugi (Japanese cedar, Cryptomeria japonica) wood near the pith perpendicular to the grain

et al. 2019

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“…The direction parallel to the fiber is the longitudinal direction (L), the direction perpendicular to the growth ring is the radial direction (R), and the direction tangent to the growth ring is the tangential direction (T). The radial and tangential directions are collectively referred to as the transverse directions [2,3]. The mechanical evolution in different directions is key to guaranteeing reliability and safety during construction.…”

Section: Introductionmentioning

confidence: 99%

Compressive Mechanical Properties of Larch Wood in Different Grain Orientations

et al. 2022

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As a green and low-carbon natural polymer material, wood has always been popular in engineering applications owing to its excellent physical and mechanical properties. In this study, compression tests in conjunction with in situ test methods (DIC method) were used to investigate the compression mechanism of wood samples in the longitudinal, radial, and tangential directions. The macroscopic failure modes, energy dissipation results, and variations in the strain field were analyzed. The results showed that the load–displacement curve in each grain orientation included three stages: an elasticity stage, yield stage, and strengthening stage. Both the compressive strength and elastic modulus in the longitudinal direction were significantly higher than those in the radial and tangential directions, but there was no significant difference between the radial and tangential directions. Specimens in the longitudinal direction mainly presented fiber buckling, fiber shear slippage, and fiber fracture failure; in radial directions mainly presented compression compaction of the fiber cells; and in the tangential directions presented buckling and shear failure of the laminar layers. The energy absorption in the longitudinal direction was better than in the other directions. The strain changed significantly in the loading direction in the elastic stage while the shear strain changed remarkably in the yield stage in each grain orientation. In this paper, the compression mechanical properties of larch wood in different grain orientations were studied to provide a reference for its safe application in engineering.

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Ray properties in the stems of Dahurian larch (Larix gmelinii) and Japanese larch (Larix kaempferi)

Kim

et al. 2020

IAWA J.

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The radial variation of rays within the stems of Dahurian larch and Japanese larch growing in Korea was studied to obtain valuable information to identify the two species and determine wood quality. Uniseriate ray height, fusiform ray height, ray number, ray spacing, and epithelial cell number were investigated by optical microscopy. The heights of uniseriate and fusiform rays and epithelial cell numbers in Dahurian larch were lower than those in Japanese larch. Dahurian larch wood had greater ray number and ray spacing than Japanese larch wood. In both species, the heights of uniseriate and fusiform rays and epithelial cell number increased with increasing growth ring number but then stabilized from a certain growth ring number. However, ray number and ray spacing decreased with age but were stable toward the bark. There were significant differences in all ray properties between the two species. Furthermore, in both species, the number and spacing of rays showed a significant negative correlation with uniseriate ray height. The relationships between uniseriate and fusiform ray height, and between ray spacing and ray number were significantly positive. In conclusion, the results from this study provide basic information that can be used to identify these species, and the quality indices from ray properties will improve the effective utilization of the two woody species.

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Radial variation in partial compression properties perpendicular to the grain of Japanese larch (Larix kaempferi)

Cited by 4 publications

References 12 publications

Partial compression strength of sugi (Japanese cedar, Cryptomeria japonica) wood near the pith perpendicular to the grain

Partial compression strength of sugi (Japanese cedar, Cryptomeria japonica) wood near the pith perpendicular to the grain

Compressive Mechanical Properties of Larch Wood in Different Grain Orientations

Ray properties in the stems of Dahurian larch (Larix gmelinii) and Japanese larch (Larix kaempferi)

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