Effect of Growth Characteristics on the Mechanical Properties of Douglas-Fir in Radial Compression

Bodig, Jozsef

doi:10.1515/hfsg.1965.19.3.83

Cited by 6 publications

(6 citation statements)

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“…For both species, but especially for spruce, the stress-strain curves appear smoothed and reduced levels of stress at PL and plateau stress are observed. Notably, a saw-tooth pattern is no longer observed in radial compression of spruce, similar to findings reported for Douglas-fir [34]. Furthermore, a distinct stress peak after the phase of elastic formation of tangentially compressed spruce is also highlighting the softening effect of high levels of MC.…”

Section: Resultssupporting

confidence: 78%

The effect of partial delignification on the stress–strain relationship in transverse compression

Jakob

Gindl‐Altmutter

2023

J Mater Sci

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Due to very significant improvements in the mechanical performance of solid wood, densification after partial or full delignification has received renewed attention. While studies predominantly focus on isolated cases, e.g., one wood species densified in one anatomical direction, systematic investigations of the effect of wood structure on the densification process are seldom performed. The present study compares the deformation patterns of one representative softwood (spruce) and hardwood (poplar), respectively, in transverse compression. In terms of variables, the native and partially delignified state, wet and dry conditions, and three different orientations of wood grain are considered. It shows that the structural inhomogeneity of spruce wood, with low-density earlywood and high-density latewood, governs its densification pattern and hinders defect-free densification. Contrarily, diffuse-porous poplar is structurally more homogeneous, which together with more efficient softening by delignification leads to favorable densification behavior. Overall, delignification led to a significant softening of both wood species in transverse compression, which greatly enhanced the softening effect of high wood moisture content.

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Section: Resultssupporting

confidence: 78%

The effect of partial delignification on the stress–strain relationship in transverse compression

Jakob

Gindl‐Altmutter

2023

J Mater Sci

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“…radial and the tangential directions, in which radial compression has been shown to b mainly caused by cell collapse, while tangential compression is caused by growth rin buckling deformation and shear slippage between growth rings [4,[12][13][14].…”

Section: Methodsmentioning

confidence: 99%

“…This can be attributed to the vulnerability of earlywood cells and the parallel arrangement of early-and latewood when subjected to tangential compression, which enabled their cells to collectively participate in the compression and effectively inhibit deformation [40,41]. Boding [13], Kennedy [42], and Tabarsa and Chui [15] similarly found that the whole cell layer of latewood bends under tangential compression. This is consistent with the fiber buckling of our specimen along the growth ring.…”

Section: Failure Characteristicsmentioning

confidence: 99%

Effects of Growth Ring Width, Height from Tree Base, and Loading Direction on Transverse Compression of Plantation Japanese Larch Wood

Zhang

Wang

Jiang

et al. 2023

Forests

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This study aimed to investigate the effects of growth ring width, height from the tree base, and loading direction on the transverse compressive strength of Japanese larch wood, which is commonly used in wood structures in China. Plantation wood is often used to replace natural forest woods for reconstruction purposes, despite significant differences in properties (e.g., growth rings, density, strength) between them. The ends of transversely compressed wood members in such structures are prone to damage by breaking or crushing. A transverse compressive test was conducted following Chinese national standards, which revealed the following key findings. (1) There was a significant difference in the transverse compressive strength of wood with different growth ring widths (p < 0.05). The radial and slant compressive strength of wood increases with growth ring width, while the tangential compressive strength decreases as growth ring width increases. (2) The transverse compressive strength of wood decreases as the height from the tree base increases. The radial, tangential, and slant compressive strength at a lower height were 18.39%, 22.58%, and 18% higher than those at a greater height in the stem, respectively, with significant differences at the 0.05 level. (3) The load–displacement curve of Japanese larch wood under radial and slant compression follows a “three-segment” form. In contrast, the load–displacement curve of tangential compression is a continuous curve that drops sharply upon reaching its highest point. (4) There is a significant difference in the transverse compressive strength of Japanese larch wood in different loading directions when growth ring width and height from the tree base are constant (p < 0.05), which fall into order as tangential > radial > slant.

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“…A great many constitutive models have been proposed to describe the compression properties of wood [7][8][9][10][11][12]. Additionally, in order to study the failure characteristics of wood, a large number of studies on the failure modes during longitudinal [13][14][15][16], radial [10,17], and tangential compression [18] have been conducted.…”

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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Effect of Growth Characteristics on the Mechanical Properties of Douglas-Fir in Radial Compression

Cited by 6 publications

References 0 publications

The effect of partial delignification on the stress–strain relationship in transverse compression

The effect of partial delignification on the stress–strain relationship in transverse compression

Effects of Growth Ring Width, Height from Tree Base, and Loading Direction on Transverse Compression of Plantation Japanese Larch Wood

Compressive Mechanical Properties of Larch Wood in Different Grain Orientations

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