Prospects for within-tree variation of the acoustoelastic behaviors in Japanese cedar

Hasegawa, Masumi; Yano, Yuji; Matsumura, Junji; Oda, Kazuhiro

doi:10.1016/j.ndteint.2012.03.010

Cited by 8 publications

(10 citation statements)

References 14 publications

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“…FENGEL & WEGENER (1989), NISGOSKI (1999) e TRIANOSKI (2010, 2012 complementam que o teor de extrativos para madeira de coníferas está na faixa de 2 a 10%. A C. japonica utilizada neste estudo apresentou valores médios de extrativos totais para as porções de cerne e alburno semelhantes aos valores encontrados por NURMI (1992) para Pinus abies, P. sylvestris, P. pubescens, P. pendula, P. incana, P. glutinosa e P. tremula.…”

Section: Avaliação Das Propriedades Químicasunclassified

Propriedades físicas e químicas da madeira de cerne e alburno de Cryptomeria japonica

Fonte

Trianoski

Iwakiri

et al. 2017

Rev. Ciên. Agrovet.

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Universidade Federal do Paraná, Curitiba, PR, Brasil. * Autor para correspondência RESUMOO estudo das propriedades físicas e a composição química da madeira são de grande importância por estarem relacionadas à transformação industrial, bem como à sua aptidão as mais variadas formas de utilização. Com base nisto, o presente estudo objetivou avaliar as propriedades químicas e físicas da Cryptomeria japonica nas porções do lenho referentes ao cerne e alburno. Foram coletadas 200 árvores, as quais foram seccionadas em toras para o desdobro, sendo então, amostradas 55 tábuas provenientes das 1ª e 2ª toras. A partir das tábuas foram separadas amostras da região do cerne e do alburno para a avaliação das propriedades químicas e físicas. As propriedades químicas foram determinadas de acordo com a norma TAPPI, sendo elas: teor de extrativos, teor de lignina, teor de materiais inorgânicos e potencial hidrogeniônico (pH). Já as propriedades físicas avaliadas foram a massa específica e estabilidade dimensional, ambas de acordo com a norma COPANT. De maneira geral, ambas as porções do lenho apresentaram propriedades químicas compatíveis com a literatura para a Cryptomeria japonica, com menores valores na porção do alburno. Em relação às propriedades físicas, a espécie apresentou massa específica de baixa a média, sendo ela semelhante para ambas as porções do lenho, e boa estabilidade dimensional. Com base nas pequenas variações encontradas entre as diferentes porções, principalmente nas propriedades físicas, acredita-se que haverá pouca influência desta variabilidade sobre o processamento e uso da madeira de Cryptomeria japonica. PALAVRAS-CHAVE:massa específica, retratibilidade, anisotropia, extrativos. ABSTRACTThe study of the physical properties and chemical composition of the wood are of great importance for being related to industrial transformation as well as its aptness the most varied forms of use. On this basis, this study aimed to evaluate the chemical and physical properties of Cryptomeria japonica in wood samples for the heartwood and sapwood. The chemical properties of the content of extractives, lignin and inorganic materials content and hydrogenic potential (pH) were determined. The physical properties related to determination of density and dimensional stability, were evaluated by using 951 samples. In general, both wood samples presented chemical properties compatible with the literature for Cryptomeria japonica. For both samples a low content of extractives was obtained, being lower in the sapwood. The results indicated that the species presented density from low to medium; it is similar to both wood samples. Regarding the dimensional stability Cryptomeria japonica was rated as good stability.

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Section: Avaliação Das Propriedades Químicasunclassified

Propriedades físicas e químicas da madeira de cerne e alburno de Cryptomeria japonica

Fonte

Trianoski

Iwakiri

et al. 2017

Rev. Ciên. Agrovet.

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“…Many researchers have reported that this technique is simple and useful for evaluating various properties of various materials [9]- [13]. Hasegawa et al have reported that the acoustoelastic technique is a useful way to determine the applied stress in wood [12] [13]. In this study, the acoustoelastic technique was used with surface SH-waves.…”

Section: Introductionmentioning

confidence: 97%

Measurement of Surface SH-Wave Velocities Generated on the Surface of Japanese Cypress Column

Hasegawa

Matsumura²

2014

OJA

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Polyetherimide resin wedge transducers were used to generate a shear wave that was obliquely incident relative to the surface of a Japanese cypress column for measuring the surface SH-wave velocity. As the inter-transducer distance increased, the propagation time increased and the amplitude became smaller. The propagation time and the amplitude were significantly correlated with the inter-transducer distance. The SH-wave velocity ranged from 1270 m/s to 1496 m/s. Surface SH-wave velocity was lower in the central part of the column and higher in the outer part. Velocity was negatively correlated with moisture content at 1% of significance level. These results suggest the accomplishment of the first target for applying the surface SH-wave acoustoelastic technique to nondestructive evaluation of drying stress in wood.

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“…As a simple and low-cost nondestructive testing technique, stress wave method has been commonly used to assess internal conditions of wood structural members in buildings, timber bridges, and other timber structures Ross 2004, Ross andPellerin 1994). Stress wave velocity measured in trees has also been found effective in detecting moderate to severe decay in urban trees (Lawday and Hodeges 2000, Wang et al 2004, Masumi et al 2012, Najafi et al 2009, Guntekin et al 2013. More recent development of efficient inversion algorithms enables stress wave techniques to be applied to urban trees to construct two dimensional (2D) acoustic tomograms for better revealing the internal condition of a tree trunk (Berndt et al1999, Bucur 2003, Divos and Divos 2005, Lin et al 2008, Socco et al 2004.Some commercial acoustic equipment such as Picus Sonic Tomograph (Argus Electronic Gmbh, Rostock, Germany), ArborSonic 3D Acoustic Tomograph (Fakopp Enterprise, Agfalva, Hungary), and Arbotom (RinnTech, Heidelberg, Germany) are now available for inspectors to obtain a 2D tomogram image by testing a tree's cross-section or 3D tomogram images through testing multiple cross-sections in a tree trunk.…”

Section: Introductionmentioning

confidence: 99%

Stress wave velocity patterns in the longitudinal–radial plane of trees for defect diagnosis

Weng

et al. 2016

Computers and Electronics in Agriculture

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Acoustic tomography for urban tree inspection typically uses stress wave data to reconstruct tomographic images for the trunk cross section using interpolation algorithm. This traditional technique does not take into account the stress wave velocity patterns along tree height. In this study, we proposed an analytical model for the wave velocity in the longitudinal-radial (LR) plane of a live tree. Both field and laboratory stress wave testing were conducted to determine the stress wave velocity patterns in healthy and defective trees. The results showed that the ratio of the wave velocity at a propagation path angle θ(with respect to the radial direction) to the radial velocity in healthy trees approximated a second-order parabolic curve with respect to the symmetric axis (θ = 0). Our analysis of the velocity patterns indicated that the measured velocities in healthy trees were in a good agreement with the theoretical models. The results of

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Prospects for within-tree variation of the acoustoelastic behaviors in Japanese cedar

Cited by 8 publications

References 14 publications

Propriedades físicas e químicas da madeira de cerne e alburno de Cryptomeria japonica

Propriedades físicas e químicas da madeira de cerne e alburno de Cryptomeria japonica

Measurement of Surface SH-Wave Velocities Generated on the Surface of Japanese Cypress Column

Stress wave velocity patterns in the longitudinal–radial plane of trees for defect diagnosis

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