Impact of the Direction of Non-destructive Test with Respect to the Annual Growth Rings of Pine Wood

Jaskowska-Lemańska, Justyna; Wałach, Daniel

doi:10.1016/j.proeng.2016.08.761

Cited by 11 publications

(11 citation statements)

References 4 publications

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“…Equations (15) and (18) form a pair of mutually coupled equations in e zR (r) and h zI (r). The same can be said for Equations (16) and (17). Each pair of mutually coupled equations have a similar mathematical structure.…”

Section: ∂D φ ∂φmentioning

confidence: 91%

“…In the following equations from Equations (27)- (30) the values of the A ij (where i = 3 and j = 1, ..., 9) used in the Equation (17) are detailed.…”

Section: ∂D φ ∂φmentioning

confidence: 99%

“…In [17], the effect of annual growth rings on nondestructive measurements is explicitly studied. This limits the application of microwave techniques in areas such as measurement of living trees in situ.…”

Section: Introductionmentioning

confidence: 99%

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Numerical Study of Focusing Effects of Microwaves inside Wood Due to Timber Ring Structure

Montero

López-Espí

Martinez-Rojas

et al. 2018

Forests

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Abstract:The aim of this study is the detailed calculation of microwave propagation inside raw timber in cylindrical configurations. Two different approaches have been used. The first one uses an exact formulation and analytical approximations in order to explore the electromagnetic field distribution inside dry wood. The introduction of conductivity in the exact model makes it so complex that the equations are unsuitable for analytical manipulation. In order to further explore the effect of moisture in cylindrical wood structures, a full scale numerical simulation using commercial software has been performed. The results show that for microwave frequencies in the 3 GHz range and for typical wood parameters, a cylindrical log behaves as a kind of Fresnel lens. This work has important applications in microwave treatment and sensing of wood.

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Section: ∂D φ ∂φmentioning

confidence: 91%

“…In the following equations from Equations (27)- (30) the values of the A ij (where i = 3 and j = 1, ..., 9) used in the Equation (17) are detailed.…”

Section: ∂D φ ∂φmentioning

confidence: 99%

See 1 more Smart Citation

Numerical Study of Focusing Effects of Microwaves inside Wood Due to Timber Ring Structure

Montero

López-Espí

Martinez-Rojas

et al. 2018

Forests

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show abstract

“…The course of the record is used to assess the homogeneity of the material. The quotient of the surface area under the diagram and the diagram's length is used to determine the hardness and the density of the wood [4][5]. Characteristic peaks in the drilling resistance diagram symbolize changes of the subsequent annual growth rings ( Fig.…”

Section: Timber Diagnosticsmentioning

confidence: 99%

Contractor errors as the cause of emergency conditions of a timber roof rafter framing

2019

Self Cite

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The paper presents results of an analysis conducted in order to determine a cause of an emergency state of a timber roof rafter framing of a central nave ceiling in a church. The article showed an assessment of the current technical conditions, a description of the diagnostic tests performed and the results of the static strength analysis. Based on that information, the causes of this emergency state are described as the consequence of contractor’s errors during the execution and significant derogations from the construction design. Moreover, an implementation of a repair programme in order to restore the full value in use of the building is recommended.

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“…On the other hand, testing wood hardness is more difficult to interpret and less reliable than testing isotropic materials. Difficulties are caused by the variability of the mechanical parameters of timber, such as timber defects, moisture content or the direction of testing in relation to the anatomical structure of the wood[26]. Nevertheless, sclerometer measurements for wood, hardness measured by an indenter, are becoming increasingly common, because they measure the density of the material, which is valuable information to estimate the load-bearing capacity of a timber.…”

mentioning

confidence: 99%

Non-Destructive Testing Methods as a Main Tool Supporting Effective Waste Management in Construction Processes

Jaskowska-Lemańska

Sagan

2019

Archives of Civil Engineering

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Construction and demolition (C&D) waste management should be accordance with the waste management hierarchy. In practice, C&D waste are often downcycling. It is the result of many factors, including lack of awareness about the value inherent in waste. The paper presents analysis of the adaptability of non-destructive testing (NDT) methods for technical assessment of waste properties. As part of the work, non-destructive testing methods were described and classified in accordance with material and the features they enable testing. The publication presents examples of the use of NDT in the recovery of building materials during construction projects, in the field of influence of technical information of waste on the way it is managed. Finally, a scheme of waste management process during the renovation of an object with the application of NDT methods was presented.

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Impact of the Direction of Non-destructive Test with Respect to the Annual Growth Rings of Pine Wood

Cited by 11 publications

References 4 publications

Numerical Study of Focusing Effects of Microwaves inside Wood Due to Timber Ring Structure

Numerical Study of Focusing Effects of Microwaves inside Wood Due to Timber Ring Structure

Contractor errors as the cause of emergency conditions of a timber roof rafter framing

Non-Destructive Testing Methods as a Main Tool Supporting Effective Waste Management in Construction Processes

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