Effect of freezing temperature on impact bending strength and shore-D hardness of some wood species

Özkan, Osman Emre

doi:10.15376/biores.17.4.6123-6130

Cited by 4 publications

(1 citation statement)

References 17 publications

(26 reference statements)

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“…studied and evaluated the effects of various freezing temperatures (−20, −40, −78.5, and −196 • C) on the growth of beech (Fagus orientalis Lipsky), Scots pine (Pinus sylvestris L.), fir (Abies nordmanniana subsp. bornmulleriana) and spruce (Pinus sylvestris L.) wood impact flexural strength compared to non-frozen wood (+20 • C) [25]. The results indicate that softwoods have good impact flexural strength properties in the frozen state and can be applied in lowtemperature environments.…”

Section: Introductionmentioning

confidence: 93%

Molecular Dynamics Simulation of the Effect of Low Temperature on the Properties of Lignocellulosic Amorphous Region

Jiang

Wang

Guo

et al. 2023

Forests

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In this paper, a molecular model of cellulose amorphous region-water molecule was developed using Materials Studio software by applying the molecular dynamics method. The effect of low temperature on the properties of the lignocellulosic amorphous region, the main component of wood, was investigated in an attempt to explain the macroscopic property changes from a microscopic perspective and to provide a theoretical basis for the safe use of wood and wood products in low-temperature environments and other related areas of research. Dynamic simulations were carried out at 20 °C, 0 °C, −30 °C, −70 °C, −110 °C and −150 °C for the NPT combinations to obtain the energy, volume, density, and hydrogen bonding change trends of their models, respectively. The changes in the microstructure of the water molecule–cellulose amorphous region model were analyzed, and the mechanical properties were calculated. The results showed that the interaction between the amorphous cellulose region and water molecules was enhanced as the temperature decreased, the density of the models increased, and the volume decreased. The number of total hydrogen bonds and the number of hydrogen bonds between water molecule–cellulose chains increased for each model, and the decrease in temperature made the cellulose molecular activities weaker. The values of G, E, and K increased with the decrease in temperature, and K/G decreased with the decrease in temperature. It shows that the decrease in temperature is beneficial to enhance the mechanical properties of the amorphous region of cellulose and increases the stiffness of the material. However, the toughness and plasticity decrease when the temperature is too low.

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Section: Introductionmentioning

confidence: 93%

Molecular Dynamics Simulation of the Effect of Low Temperature on the Properties of Lignocellulosic Amorphous Region

Jiang

Wang

Guo

et al. 2023

Forests

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Effects of moisture content on the behaviour of Scots pine heartwood and sapwood under impact

Hassan Vand,

Tippner

2024

J Wood Sci

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The material properties of sapwood and heartwood vary within various wood species and even they can show significant differences within a single tree. Scots pine (Pinus sylvestris L.), a species that plays a crucial role in timber production for joinery and building construction applications, is among those that show a notable distinction between its heartwood and sapwood. To examine the influence of moisture content (MC) on the impact behaviour of the sapwood and heartwood of pine, we tested specimens with two distinct moisture levels: a low moisture content (LMC) group with 12% MC and a high moisture content (HMC) group with 45% MC. In our study, we investigated deflection, normal strain and force development of the specimens during the short period of an impact, and also calculated the impact bending strength (IBS) of samples, using an impact testing machine equipped with a high-speed camera and digital image correlation method. Our results indicate that the differences between sapwood and heartwood at LMC were insignificant in the case of maximum deflection and normal strain, thus there is no need for differentiation; however, these differences became more pronounced, and non-negligible, with an increase in MC. We also evaluated the IBS of both heartwood and sapwood and found that, at LMC, heartwood had greater impact bending strength than sapwood, making it a preferable choice as a material subjected to impact loadings. Conversely, at HMC, both heartwood and sapwood would be equally strong against impacts, indicating that pine green wood shows no sensitivity to the ratio of sapwood to heartwood in the tree.

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Investigating Freeze-Thaw Resistance of Various Wood Species: A Comparative Study of Stiffness, Deformation Capacity, and Compressive Strength Properties

Asare,

Stoescu,

Balmori

et al. 2023

Preprint

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Effect of freezing temperature on impact bending strength and shore-D hardness of some wood species

Cited by 4 publications

References 17 publications

Molecular Dynamics Simulation of the Effect of Low Temperature on the Properties of Lignocellulosic Amorphous Region

Molecular Dynamics Simulation of the Effect of Low Temperature on the Properties of Lignocellulosic Amorphous Region

Effects of moisture content on the behaviour of Scots pine heartwood and sapwood under impact

Investigating Freeze-Thaw Resistance of Various Wood Species: A Comparative Study of Stiffness, Deformation Capacity, and Compressive Strength Properties

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