Comparison between three-point and four-point flexural tests to determine wood strength of Eucalyptus specimens

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...

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Autores principales:	Hein,Paulo Ricardo Gherardi, Brancheriau,Loïc
Lenguaje:	English
Publicado:	Universidad del Bío-Bío 2018
Materias:	Acoustic vibration density Eucalyptus grandis static bending test stiffness strength
Acceso en línea:	http://www.scielo.cl/scielo.php?script=sci_arttext&pid=S0718-221X2018000300333
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spelling	oai:scielo:S0718-221X20180003003332018-09-26Comparison between three-point and four-point flexural tests to determine wood strength of Eucalyptus specimensHein,Paulo Ricardo GherardiBrancheriau,Loïc Acoustic vibration density Eucalyptus grandis static bending test stiffness strength 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).info:eu-repo/semantics/openAccessUniversidad del Bío-BíoMaderas. Ciencia y tecnología v.20 n.3 20182018-07-01text/htmlhttp://www.scielo.cl/scielo.php?script=sci_arttext&pid=S0718-221X2018000300333en10.4067/S0718-221X2018005003401
institution	Scielo Chile
collection	Scielo Chile
language	English
topic	Acoustic vibration density Eucalyptus grandis static bending test stiffness strength
spellingShingle	Acoustic vibration density Eucalyptus grandis static bending test stiffness strength Hein,Paulo Ricardo Gherardi Brancheriau,Loïc Comparison between three-point and four-point flexural tests to determine wood strength of Eucalyptus specimens
description	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).
author	Hein,Paulo Ricardo Gherardi Brancheriau,Loïc
author_facet	Hein,Paulo Ricardo Gherardi Brancheriau,Loïc
author_sort	Hein,Paulo Ricardo Gherardi
title	Comparison between three-point and four-point flexural tests to determine wood strength of Eucalyptus specimens
title_short	Comparison between three-point and four-point flexural tests to determine wood strength of Eucalyptus specimens
title_full	Comparison between three-point and four-point flexural tests to determine wood strength of Eucalyptus specimens
title_fullStr	Comparison between three-point and four-point flexural tests to determine wood strength of Eucalyptus specimens
title_full_unstemmed	Comparison between three-point and four-point flexural tests to determine wood strength of Eucalyptus specimens
title_sort	comparison between three-point and four-point flexural tests to determine wood strength of eucalyptus specimens
publisher	Universidad del Bío-Bío
publishDate	2018
url	http://www.scielo.cl/scielo.php?script=sci_arttext&pid=S0718-221X2018000300333
work_keys_str_mv	AT heinpauloricardogherardi comparisonbetweenthreepointandfourpointflexuralteststodeterminewoodstrengthofeucalyptusspecimens AT brancheriauloic comparisonbetweenthreepointandfourpointflexuralteststodeterminewoodstrengthofeucalyptusspecimens
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Comparison between three-point and four-point flexural tests to determine wood strength of Eucalyptus specimens

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