Comparison between modulus of elasticity values calculated using 3 and 4 point bending tests on wooden samples

Brancheriau, Loïc; Baillères, Henri; Guitard, D.

doi:10.1007/s00226-002-0147-3

Cited by 69 publications

(43 citation statements)

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“…The three-point bending test provided the modulus of elasticity which is underestimated in relation to the four-point bending test due to its neglect of shear and indentation effects. This underestimation was valued by Brancheriau et al (2002) to be about 19%. Other researchers stated not only for hardwood species that the dynamic modulus of elasticity shows higher values than those measured by the static bending test (Bodig and Jayne 1982, Ilic 2001, Oliveira et al 2002, Karlinasari et al 2008).…”

Section: Comparison Of Individual Techniquesmentioning

confidence: 92%

Prediction of mechanical properties - modulus of rupture and modulus of elasticity - of five tropical species by nondestructive methods

Baar

Tippner

Rademacher

2015

Maderas, Cienc. tecnol.

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This paper analyzes the usability of different dynamic moduli of elasticity and wood density for the prediction of mechanical properties -static modulus of elasticity and modulus of rupture -in samples with grain deflection from the longitudinal direction. Five tropical hardwoods (Afzelia bipindensis, Intsia bijuga, Millettia laurentii, Astronium graveolens and Microberlinia brazzavillensis) with different grain characteristics were used for this purpose. The fiber deflection was caused by the presence of interlocked grain or the working process. The three nondestructive techniques used in this study -longitudinal and flexural resonance method and ultrasound method -provided higher values of modulus of elasticity than the static bending test, but close correlation was observed between these variables. The weakest correlation was found for the ultrasound method which is probably caused by its measuring mechanism. The prediction of the modulus of rupture is less accurate when the dynamic modulus of elasticity is compared with the static modulus of elasticity; on the other hand, it was still good in comparison with the density model, which is inapplicable when grain deflection occurs in wood. In the wood of Zebrano where the interlocked grain was strongly developed, almost all of the correlation coefficients showed the lowest values and the prediction of modulus of rupture by nondestructive techniques was unsatisfactory.

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Section: Comparison Of Individual Techniquesmentioning

confidence: 92%

Prediction of mechanical properties - modulus of rupture and modulus of elasticity - of five tropical species by nondestructive methods

Baar

Tippner

Rademacher

2015

Maderas, Cienc. tecnol.

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“…The same strips were used to evaluate the radial modulus of elasticity (MOE Rad ) and the radial modulus of rupture (MOR Rad ), through three-point bending tests (Brancheriau et al, 2002). Before testing the specimen dimensions (thickness and width) were measured with a digital calliper (0.01 mm resolution).…”

Section: Genetic Materialsmentioning

confidence: 99%

Does selecting for improved growth affect wood quality of Pinus pinaster in Portugal?

Gaspar

Lousada

Rodrigues

et al. 2009

Forest Ecology and Management

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“…Physical-mechanical parameters included: air-dry specific gravity; Young's modulus (E, measured by 3-point static bending and corrected for equivalent 4-point bending according to Brancheriau et al, 2002); fibre saturation point (FS P, determined by the intersection point of shrinkage) and volumetric shrinkage (VS h, from green to oven-dry). Chemical parameters included lignin (Klason), cellulose, alcohol-benzene and hot-water extractives content.…”

Section: Data Analysis and Comparison With Database Valuesmentioning

confidence: 99%

Physico-chemical indicators of inter-specific variability in vibration damping of wood

et al. 2010

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Abstract• The vibration damping coefficient (tanδ) of wood is an important property for acoustical uses, including musical instruments. Current difficulties in the availability of some of the preferred species call for diversification, but this comes up against the lack of systematic damping coefficient data.• Keeping in mind the possible factors affecting tanδ, could we predict its variations between species, by using indicators that are either easily measured and/or readily available for many species?• Vibrational properties, equilibrium moisture content and colorimetric parameters were assessed on 94 wood types belonging to 76 species. Experimental results were then related to data on chemical contents and physical properties from the CIRAD database. The "standard" relationship between tanδ and specific modulus of elasticity (E'/ρ) explained only half of the variations. Deviations from this trend were correlated to extractives content, yet effects were not directly quantitative. Damping deviations were also correlated to colour and moisture-related properties, especially so with fibre saturation point.• By taking into account a combination of moisture-related properties, colour -or extractives content, and the "standard" relationship between tanδ and E'/ρ, we could propose simple predictive models which explain up to 89% of observed variations in tanδ between 48 species.

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Comparison between modulus of elasticity values calculated using 3 and 4 point bending tests on wooden samples

Cited by 69 publications

References 1 publication

Prediction of mechanical properties - modulus of rupture and modulus of elasticity - of five tropical species by nondestructive methods

Prediction of mechanical properties - modulus of rupture and modulus of elasticity - of five tropical species by nondestructive methods

Does selecting for improved growth affect wood quality of Pinus pinaster in Portugal?

Physico-chemical indicators of inter-specific variability in vibration damping of wood

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