Please use this identifier to cite or link to this item: http://repositorio.ufla.br/jspui/handle/1/34638
Title: Comparison between three-point and four-point flexural tests to determine wood strength of eucalyptus specimens
Keywords: Acoustic vibration
Density
Eucalyptus grandis
Static bending test
Stiffness
Strength
Issue Date: Jul-2018
Publisher: Universidad del Bío-Bío
Citation: HEIN, P. R. G.; BRANCHERIAU, L. Comparison between three-point and four-point flexural tests to determine wood strength of eucalyptus specimens. Maderas. Ciencia y tecnología, Concepción, v. 20, n. 3, July 2018.
Abstract: Comparison between flexural wood strength values obtained from three-point and four-point bending tests in wood were only reported in few previous works, but remains unclear. Thus, the aim of this study was to determine the relationship between wood strength (MOR) obtained by 4-point and 3-point bending tests in Eucalyptus. Two or three specimens were cut from the same scantling (thus considered as twin) and submitted to flexural vibration tests. Then 190 wood specimens were tested by 4-point bending tests and 138 twin specimens were submitted to 3-point bending tests. Wood strength determined from 3-point bending test presented significantly higher mean value (76,8 MPa) than that from 4-point bending test (73 MPa). A linear regression for converting MOR from 3-point to 4-point bending test was proposed for these Eucalyptus specimens: MOR4p = 0,889 × MOR3p + 5,14 in MPa (R²=0,74). The correlation of MOR in 3-point bending with density was higher (R²=0,57) than in 4-point bending (R²=0,45). The correlations between dynamic elastic moduli and moduli of rupture were similar (circa R²=0,57 for MOR3p and R²=0,65 for MOR4p).
URI: http://repositorio.ufla.br/jspui/handle/1/34638
Appears in Collections:DCF - Artigos publicados em periódicos

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