Effects of Density, Temperature, Size, Grain Angle of Wood Materials on Nondestructive Moisture Meters

Pang, Sung-Jun; Jeong, Gi Young

doi:10.5658/wood.2019.47.1.40

Cited by 7 publications

(1 citation statement)

References 9 publications

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“…A method is required to investigate the inner state of wooden properties to conserve historic properties appropriately (Oh et al, 2019). Non-destructive testing and evaluation (NDT &E) methods are normally used to determine the interior structure of wooden properties (Kim et al, 1996;Kim et al, 2003;Lee et al, 2003;Maulana et al, 2019;Pang and Jeong, 2019).…”

Section: Introductionmentioning

confidence: 99%

Tomosynthesis Feasibility Study for Visualization of Interiors of Wood Columns Surrounded with Walls

LEE¹,

Kim²

2022

J. Korean Wood Sci. Technol.

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The need for non-destructive testing and evaluation of Korean traditional wooden buildings is increasing because of their widespread deterioration. Among all types of deterioration, termite damage in wooden columns is the most difficult to detect with the naked eye because it starts inside the wood, and the initial deterioration is small. X-ray computed tomography (CT) is the best technology to investigate the inner state of wood that has less damage, but applying it to wooden columns between walls is challenging. Therefore, the feasibility of tomosynthesis, which is a method to reconstruct a coronal section of a subject with a few X-ray projections from a limited angle of rotation, was studied as an alternative to CT. Pine (P. densiflora) with three artificial holes was prepared as a specimen to evaluate the quality of reconstructed tomosynthesis images according to the different number of projections. The quality of the tomosynthesis images in the in-focus plane was evaluated using the contrast-to-noise ratios, while a vertical resolution between the images was assessed by determining the artificial spread function. The quality of the tomosynthesis image in the in-focus plane increased as the number of projections increased and then remained constant as the number of projections reached 21 or over. In the case of vertical resolution, there was no significant difference when 21 projections or more were used to reconstruct the images. A distinct difference between coronal section images was found when the distance was more than 10 mm from one plane to another plane.

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Section: Introductionmentioning

confidence: 99%

Tomosynthesis Feasibility Study for Visualization of Interiors of Wood Columns Surrounded with Walls

LEE¹,

Kim²

2022

J. Korean Wood Sci. Technol.

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Investigation of Influence of Different Fungi on Decaying of White Birch by Electrochemical Fingerprints

Wang¹

2022

International Journal of Electrochemical Science

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Decaying of wood is a complex process, and the study of the mechanism and the changes of chemical substances caused by wood decay can provide a theoretical basis for the selection of decay-resistant construction materials. Electrochemical fingerprinting is a novel analytical technique to determine the signal of electrochemically active substances in a sample. In this work, electrochemical techniques were used to investigate changes in fingerprint profiles of white birch building timber after decay by different wood decay fungi. Combined with infrared spectroscopy, we found that the lignin was degraded to some extent in all wood decay caused by white rot fungi. Although the change of benzene ring skeleton was not obvious, the side chains such as the disease group, CH structure, and phenol ether bond between the benzene rings of lignin had been partially degraded. In contrast, no degradation of lignin was found after decay by brown rot fungi. In addition, all timber had degradation of cellulose and hemicellulose functional groups.

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Determination of Relationship between Thermal and Mechanical Properties of Wood Material

Özcan¹,

Korkmaz²

2019

Journal of the Korean Wood Science and Technology

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Non-destructive test techniques are becoming increasingly important for assessment and maintenance. These techniques are very useful for assessment of materials such as wood, whose performance can vary considerably depending on the conditions of use. It is possible to estimate some mechanical properties of a material by determining the movement of energy through the material with the help of these techniques. In this study, it was investigated whether the wood material could be tested nondestructively by the heat energy produced by a source. The correlations between the thermal conductivity and mechanical properties of Scots pine (Pinus sylvestris L.) and sessile oak (Quercus petraea L.) woods were investigated. The thermal conductivity (TC), density, modulus of rupture (MOR), compression strength (CS), and modulus of elasticity (MOE) values of samples were measured according to the related standards and these values were correlated with each other. The linear and multiple regression tests were employed to determine the correlation between thermal conductivity and mechanical properties. The results showed that there is a very strong correlation between thermal conductivity and both density and MOR values. However, the correlations between TC and both MOE and CS were moderate. The results of this study suggest that the thermal conductivity value can be used to estimate the density and some mechanical properties of wood.

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Effects of Density, Temperature, Size, Grain Angle of Wood Materials on Nondestructive Moisture Meters

Cited by 7 publications

References 9 publications

Tomosynthesis Feasibility Study for Visualization of Interiors of Wood Columns Surrounded with Walls

Tomosynthesis Feasibility Study for Visualization of Interiors of Wood Columns Surrounded with Walls

Investigation of Influence of Different Fungi on Decaying of White Birch by Electrochemical Fingerprints

Determination of Relationship between Thermal and Mechanical Properties of Wood Material

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