Mechanical behaviour of wood compressed in radial direction: Part II. Influence of temperature and moisture content

Huang, Chen; Chui, Ying Hei; Gong, Meng; Chana, Felisa

doi:10.1016/j.jobab.2020.10.005

Cited by 24 publications

(9 citation statements)

References 13 publications

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“…Compression at elevated levels of wood MC reveals a clear and well-known softening effect of water (Fig. 5) [33]. 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.…”

Section: Resultsmentioning

confidence: 85%

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: Resultsmentioning

confidence: 85%

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

Jakob

Gindl‐Altmutter

2023

J Mater Sci

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“…The processed wood has a specific strength higher than that of most structural metals and alloys, making it low-cost and high-performance. More detailed information concerning techniques and results of wood modifications aimed at changing the mechanical and other service properties of the wood can be found in books [ 8 , 30 , 127 ], reviews [ 128 ], and original papers [ 131 , 132 , 133 , 134 , 135 , 136 ].…”

Section: Modification and Hardening Of Wood And Cellulosementioning

confidence: 99%

Multiscale Mechanical Performance of Wood: From Nano- to Macro-Scale across Structure Hierarchy and Size Effects

et al. 2022

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This review describes methods and results of studying the mechanical properties of wood at all scales: from nano- to macro-scale. The connection between the mechanical properties of material and its structure at all these levels is explored. It is shown that the existing size effects in the mechanical properties of wood, in a range of the characteristic sizes of the structure of about six orders of magnitude, correspond to the empirical Hall-Petch relation. This “law” was revealed more than 60 years ago in metals and alloys and later in other materials. The nature, as well as the particular type of the size dependences in different classes of materials can vary, but the general trend, “the smaller the stronger”, remains true both for wood and for other cellulose-containing materials. The possible mechanisms of the size effects in wood are being discussed. The correlations between the mechanical and thermophysical properties of wood are described. Several examples are used to demonstrate the possibility to forecast the macromechanical properties of wood by means of contactless thermographic express methods based on measuring temperature diffusivity. The research technique for dendrochronological and dendroclimatological studies by means of the analysis of microhardness and Young’s modulus radial dependences in annual growth rings is described.

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“…Wood is one of the most abundant renewable materials and is widely used in construction, decoration and furniture applications [1][2][3]. However, as a hygroscopic material, wood is sensitive to water, fungi, insects, etc., which restrains its wider applications [4,5]. The variation in moisture content causes wood to swell and shrink in various degrees, resulting in deformation and cracking [6,7].…”

Section: Introductionmentioning

confidence: 99%

In Situ Construction of Thermotropic Shape Memory Polymer in Wood for Enhancing Its Dimensional Stability

et al. 2022

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The extension of wood to a wider field has been restrained significantly due to its dimensional instability that arises from variation in moisture content, which in turn brings about the risk of cracking, warping or distortion. This work proposed a novel strategy to stabilize wood by means of the in situ construction of a thermotropic shape memory polymer (SMP) inside wood. The cross-linked copolymer network (PMP) with good shape memory behavior was first investigated based on the reaction of methyl methacrylate (MMA) and polyethylene glycol diacrylate (PEGDA) in a water/ethanol solution; then, the PMP was constructed inside wood via vacuum-pressure impregnation and in situ polymerization. The weight gain, volume increment and morphology observations clearly revealed that the PMP was mainly present in wood cell lumens, cell walls and pits. The presence of PMP significantly enhanced the dimensional stability of and reduced the cracks in wood. The desirable shape recovery abilities of PMP under heating-cooling cycles were considered to be the main reasons for wood dimensional stabilization, because it could counteract the internal stress or retard the shrinkage of cell walls once water was evaporated from the wood. This study provided a novel and reliable approach for wood modification.

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Mechanical behaviour of wood compressed in radial direction: Part II. Influence of temperature and moisture content

Cited by 24 publications

References 13 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

Multiscale Mechanical Performance of Wood: From Nano- to Macro-Scale across Structure Hierarchy and Size Effects

In Situ Construction of Thermotropic Shape Memory Polymer in Wood for Enhancing Its Dimensional Stability

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