Influence of timber grain distribution on orientation of saw cuts during application: Reference to heritage structures in Sri Lanka

Mendis, M.S.; Halwatura, RU; Somadeva, D.R.K.; Jayasinghe, Randika; Gunawardana, M.

doi:10.1016/j.cscm.2019.e00237

Cited by 9 publications

(7 citation statements)

References 14 publications

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“…Although wood properties differ in each of these three directions, differences between the radial and tangential directions are normally minor compared to their mutual differences with the longitudinal direction [13]. In Sri Lanka similar type of study was conducted in Ambalam structures; a cherished heritage structure originated from the vernacular architecture in Sri Lanka [10].…”

Section: Introductionmentioning

confidence: 99%

The Effect of Direction of Load on Bending Strength of <i>Melia compositae</i>

Rajamanickam¹,

Surapura²,

Dev³

2021

IJNREM

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In this paper, empirical study of stiffness (modulus of elasticity-MoE) and Bending strength/flexural strength (modulus of rupture-MoR) in wood, mainly on radial and Tangential surface of Melia compositae wood were evaluated. Here loading in the radial direction means that load is applied to the tangential surface and loading in the tangential direction means that load is applied to the radial surface. The strength properties vary with species to species and also application of direction of load. Loading direction appreciably affects the bending properties remarkably due to the anisotropic /orthotropic nature of timber. It was observed that always MoE and MoR have greater value in Radial surface. The direction of application of load has an appreciable effect on strength properties of wood. While this is generally attributable to the presence of medullary rays in the radial direction. The bending strength of timber when loaded parallel to the direction of load is greater than that of timber loaded perpendicular to the direction of load. The ratio of flexural strength values varied from13% to 14% for Melia composita.

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Section: Introductionmentioning

confidence: 99%

The Effect of Direction of Load on Bending Strength of <i>Melia compositae</i>

Rajamanickam¹,

Surapura²,

Dev³

2021

IJNREM

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“…Adicionalmente, el proceso de secado no resulta homogéneo en las tablas que contienen los dos tipos de corte (corte mixto), por lo que la parte de la tabla con corte tangencial secará más rápido que la parte de la tabla con corte radial. Adicionalmente, en Sri Lanka se realizó un estudio donde se determinó el patron de corte a emplear en función de la distribución y superposicion de los anillos de crecimiento presentes en la troza, dado que la ubicación de los mismos en la seccion transversal de la tabla es uno de los aspectos físicos más importantes de la madera de construcción (Mendis et al 2019). De acuerdo con esta investigación, los tipos de corte encontrados en la sección transversal de la madera aserrada presentaron una distribución general de corte tangencial de 51,99%, corte radial de 38,40% y corte mixto de 9,61%, indicando que aproximadamente el 90,00% de la madera aserrada presentará un periodo de secado similar, mientras que el resto de las piezas, presentarán periodos de secado heterogéneos.…”

Section: Discussionunclassified

Análisis comparativo de la calidad dimensional de madera de pino bajo dos tecnologías de aserrío en el suroeste de Chihuahua, México

Rascón-Solano,

Aguirre-Calderón,

Nájera-Luna

et al. 2024

revagro

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El objetivo de esta investigación fue identificar las diferencias estadísticas existentes en la distribución de los tipos de corte y variabilidad dimensional de productos obtenidos en función de dos tecnologías industriales empleadas en aserraderos ejidales al suroeste de Chihuahua. Se tomaron los datos en tres aserraderos permanentes tecnificados modernos de corte fino y dos aserraderos permanentes tradicionales de sierra banda. En cada industria se consideraron al menos 50 piezas de madera con espesor de 22,23, 31,75 y 38,10 mm (7/8, 5/4 y 6/4”), en las cuales se evaluó el tipo de corte con la metodología de puntos múltiples. Se evaluó la homogeneidad de las varianzas con prueba de Levene; adicionalmente, se realizaron pruebas de t de Student en función del tipo de aserradero empleado y ANOVA de un factor con corrección de Welch para evaluar las variaciones de espesores entre aserraderos. De acuerdo con los resultados obtenidos, 51,99% de la madera es aserrada con orientación tangencial; 38,40% radial y 9,61% con corte mixto, presentando diferencias significativas por tipo de aserradero en la madera aserrada con cortes radial y mixto. Los aserraderos modernos y tradicionales resultaron estadísticamente diferentes al procesar madera de 7/8”. La madera con espesor de 5/4” no mostró diferencias entre industrias, pero si en la desviación estándar de las seis mediciones de las tablas y la madera con espesor de 6/4” presentó diferencias significativas en la media de los espesores y desviación estándar de las tablas. Los aserraderos de esta región difícilmente garantizan que el 95,00% de la madera alcance un grueso nominal final.

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“…On the aspect of wood utilization, presence of small pores in L. species, Sclerocarya burrea, Nothospondis staudtia and Trichoscypha acuminata indicates that the wood species are expected to possess fine texture bestowed upon such wood species on the basis of their small pores. Hence, Kukachika (1969) and Mendis et al (2019) referred to texture as the diameter of the pores which influenced the wood texture some of wood species like Albizia lebbek that was found to posses coarse surface as a result of its big pores (Kukachika (1969). Therefore difference in texture among wood species can be recorded as a result of the distribution of pore sizes.…”

Section: Discussionmentioning

confidence: 99%

Anatomical Examinations of Selected Wood Species of Nigerian Genera in Anacardiaceae Family

Michael

John²,

Samuel³

et al. 2022

Mediterr. J. Soc. Sci.

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Nigerian Anacarddiacea family was investigated in this study on the account of their inherent structures with a view to bringing to the fore those features that could facilitate identification towards proper utilization based on wood quality. Mature wood species of Lannea grandis, Lannea welwitchii, Mangifera indica, Nothospondis staudtia, Pseudospondias microcarpa, Sclerocarya burrea, Sorindeia trimeris, Spondias mangifera, Spondias mombin and Trichoscypha acuminate were got from the Forestry Research Institute of Nigeria herbaratum, in Ibadan. Wood samples from the wood species were sectioned into cross sectional, tangential and radial sections of about 20μm thick using a Reichert sliding microtome. Photomicrographs were taken using a digital camera mounted on a Reichert light microscope at 40 ×. The results showed that vessels were large in all the wood species except in Lannea species, Sclerocarya burrea, Nothospondis staudtia and Trichoscypha acuminata. Body ray cells were procumbent with one row of upright and/or square marginal cells in all the wood species, but could be up to four rows in Sorindeia trimeris. Generally, septate fibres, silica,crystals and gum were observed in almost all the wood species, yet, fibre pits in Mangifera indica, Nothospondis staudtia, Pseudospondias microcarpa, Sclerocarya burrea, Spondias mombin, and L. grandis were not as bordered as they were in L. acida, L. welwitchii, Sorindeia trimeris, Spondias mangifera, and Trichoscypha acuminata. S..mombin and S. mangifera can be separated on this account. It also appears that rays were storied only in Sorindeia trimeris and L. grandis. In the aspect of wood utilization, some were expected to possess fine texture, lustrous patterns and also regions of failures as a result of high rays. Received: 11 April 2022 / Accepted: 30 June 2022 / Published: 5 July 2022

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Influence of timber grain distribution on orientation of saw cuts during application: Reference to heritage structures in Sri Lanka

Cited by 9 publications

References 14 publications

The Effect of Direction of Load on Bending Strength of <i>Melia compositae</i>

The Effect of Direction of Load on Bending Strength of <i>Melia compositae</i>

Análisis comparativo de la calidad dimensional de madera de pino bajo dos tecnologías de aserrío en el suroeste de Chihuahua, México

Anatomical Examinations of Selected Wood Species of Nigerian Genera in Anacardiaceae Family

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Influence of timber grain distribution on orientation of saw cuts during application: Reference to heritage structures in Sri Lanka

Cited by 9 publications

References 14 publications

The Effect of Direction of Load on Bending Strength of &lt;i&gt;Melia compositae&lt;/i&gt;

The Effect of Direction of Load on Bending Strength of &lt;i&gt;Melia compositae&lt;/i&gt;

Análisis comparativo de la calidad dimensional de madera de pino bajo dos tecnologías de aserrío en el suroeste de Chihuahua, México

Anatomical Examinations of Selected Wood Species of Nigerian Genera in Anacardiaceae Family

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Product

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The Effect of Direction of Load on Bending Strength of <i>Melia compositae</i>

The Effect of Direction of Load on Bending Strength of <i>Melia compositae</i>