Study of the relationship between flatwise and edgewise modull of elasticity of sawn timber as a means to improve mechanical strength grading technology

Steffen, A.; Johansson, Charlotta; Wormuth, E. W.

doi:10.1007/bf02990556

Cited by 30 publications

(16 citation statements)

References 5 publications

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“…The orientation of the growth rings is chosen in order to get advantageous shape stability according to the previous studies. 4 A patented onecomponent polyurethane for green gluing has been used to glue these boards. 1 In order to measure the shape stability of the specimen in drying conditions, moisture gradients in midsections of regular beams are simulated in the fiber direction.…”

Section: Methodsmentioning

confidence: 99%

New composite timbers: full-field analysis of adhesive behavior

Clouet

Pommier

Danis

2013

The Journal of Strain Analysis for Engineering Design

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Green gluing technology may have a large interest in wood industry. It allows energy saving, thus reducing costs. In order to fulfill requirements in relevant building codes and standards, these composite timbers have to present sufficient structural performance and shape stability. The drying step during the process of green gluing may lead to local strain and stress developments on the adhesive interface. These strain and stress developments could impact the shape stability of the product and induce joint failure. However, wood spatial microstructure may absorb these developments. It has to be noted that for an organic material such as wood, the measurement of hygromechanical properties must be done without any interactions between the material and the measurement system. In order to process in this way, an optical measurement system such as the digital image correlation has been used. Results have shown the local behavior of the interface during shrinkage of wood. The strains of the adhesive bond were calculated from the measurement by means of an inverse method.

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Section: Methodsmentioning

confidence: 99%

New composite timbers: full-field analysis of adhesive behavior

Clouet

Pommier

Danis

2013

The Journal of Strain Analysis for Engineering Design

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“…Se trata un material heterogéneo y anisótropo, cuyo comportamiento mecánico, depende en gran medida de la disposición de sus fibras, la cual determina su densidad (Steffen et al, 1997), y de sus defectos, respondiendo a la teoría del eslabón más débil (Pierce, 1926;Tucker, 1927;Weibull, 1939).…”

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Estudio comparativo entre valores característicos experimentales y normativos de madera aserrada de pino silvestre = Comparative study between experimental and normative values of sawnwood of wild pine

Peña

Escamilla

Díez

et al. 2017

ADE

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Resumen-Este trabajo realiza un estudio comparativo de caracterización de vigas de madera aserradas y su comparación con la normativa. Para ello se ha utilizado dos tipos de madera muy diferentes, una muy heterogenea, con gran número de defectos, y otra muy homogénea, para comprobar la influencia de los nudos en el comportamiento mecánico de la madera. Para ello se han ensayado un total de 18 vigas de madera y 5 probetas a compresión. Posteriormente se ha realizado una comparativa con la normativa de caracterización, para comprobar su grado de definición. Se ha podido comprobar que dicha norma, se encuentra en el lado de la seguridad en el ámbito de las resistencias, pero que su definición es escasa en cuanto al módulo de elasticidad de la madera. Palabras clave-Madera; UNE-338; vigas.Abstract-This work makes a comparative study of the characterization of sawn timber and its comparison with the standard. For this purpose, two very different types of wood have been used, one very heterogeneous, with a large number of defects, and a very homogeneous one, to verify the influence of the knots on the mechanical behavior of the wood. To this end, a total of 18 wooden beams and 5 test specimens have been tested. Subsequently a comparison has been made with the standardization of characterization, to verify its degree of definition. It has been possible to verify that this norm, is in the side of the security in the field of the resistances, but that its definition is scarce as far as the modulus of elasticity of the wood.

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“…Esto explica por qué la correlación entre las propiedades de la madera sin defectos es, en general, muy buena. Para muestras pequeñas, sin defectos de pícea noruega (Picea abies), Foslie (Foslie, 1971), encontró el siguiente coeficiente de determinación de valores (R En la madera, las propiedades no están uniformemente distribuidas, como se puede apreciar en la figura 1.10 (Steffen, Johansson & Wormuth, 1997), donde se muestra la distribución de la densidad y el MOE en una sección de madera de picea noruega. En este caso particular, la densidad varía desde 400 hasta casi 600 kg/m 3 , y el MOE de 10000 a 22000 N/mm 2 .…”

Section: Propiedades De La Madera Sin Defectos Interrelación Y Variaunclassified

Estudio del comportamiento estático y dinámico de elementos de madera de pino silvestre empleados en medios auxiliares y protecciones colectivas en edificación

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Study of the relationship between flatwise and edgewise modull of elasticity of sawn timber as a means to improve mechanical strength grading technology

Cited by 30 publications

References 5 publications

New composite timbers: full-field analysis of adhesive behavior

New composite timbers: full-field analysis of adhesive behavior

Estudio comparativo entre valores característicos experimentales y normativos de madera aserrada de pino silvestre = Comparative study between experimental and normative values of sawnwood of wild pine

Estudio del comportamiento estático y dinámico de elementos de madera de pino silvestre empleados en medios auxiliares y protecciones colectivas en edificación

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