<?xml version="1.0" encoding="ISO-8859-1"?><article xmlns:mml="http://www.w3.org/1998/Math/MathML" xmlns:xlink="http://www.w3.org/1999/xlink" xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance">
<front>
<journal-meta>
<journal-id>2007-4018</journal-id>
<journal-title><![CDATA[Revista Chapingo serie ciencias forestales y del ambiente]]></journal-title>
<abbrev-journal-title><![CDATA[Rev. Chapingo ser. cienc. for. ambient]]></abbrev-journal-title>
<issn>2007-4018</issn>
<publisher>
<publisher-name><![CDATA[Universidad Autónoma Chapingo, Coordinación de Revistas Institucionales]]></publisher-name>
</publisher>
</journal-meta>
<article-meta>
<article-id>S2007-40182016000200125</article-id>
<article-id pub-id-type="doi">10.5154/r.rchscfa.2015.03.008</article-id>
<title-group>
<article-title xml:lang="en"><![CDATA[Dynamic modulus of rigidity of seven types of Mexican wood determined by torsional vibration]]></article-title>
<article-title xml:lang="es"><![CDATA[Módulos de rigidez dinámicos de siete maderas mexicanas determinados por vibraciones en torsion]]></article-title>
</title-group>
<contrib-group>
<contrib contrib-type="author">
<name>
<surname><![CDATA[Sotomayor-Castellanos.]]></surname>
<given-names><![CDATA[Javier R.]]></given-names>
</name>
<xref ref-type="aff" rid="Aff"/>
</contrib>
</contrib-group>
<aff id="Af1">
<institution><![CDATA[,Universidad Michoacana de San Nicolás de Hidalgo Facultad de Ingeniería en Tecnología de la Madera ]]></institution>
<addr-line><![CDATA[Morelia Michoacán]]></addr-line>
<country>México</country>
</aff>
<pub-date pub-type="pub">
<day>00</day>
<month>08</month>
<year>2016</year>
</pub-date>
<pub-date pub-type="epub">
<day>00</day>
<month>08</month>
<year>2016</year>
</pub-date>
<volume>22</volume>
<numero>2</numero>
<fpage>125</fpage>
<lpage>134</lpage>
<copyright-statement/>
<copyright-year/>
<self-uri xlink:href="http://www.scielo.org.mx/scielo.php?script=sci_arttext&amp;pid=S2007-40182016000200125&amp;lng=en&amp;nrm=iso"></self-uri><self-uri xlink:href="http://www.scielo.org.mx/scielo.php?script=sci_abstract&amp;pid=S2007-40182016000200125&amp;lng=en&amp;nrm=iso"></self-uri><self-uri xlink:href="http://www.scielo.org.mx/scielo.php?script=sci_pdf&amp;pid=S2007-40182016000200125&amp;lng=en&amp;nrm=iso"></self-uri><abstract abstract-type="short" xml:lang="en"><p><![CDATA[Abstract: The modulus of rigidity of wood is useful for the structural calculus and manufacture of wood products. The objective of this research was to determine the modulus of rigidity (GLT) of seven species of Mexican woods (Enterolobium cyclocarpum, Tabebuia donnell-smithii, T. rosea, Swietenia humilis, Lysiloma acapulcensis, Cordia elaeagnoides y T. chrysantha), performing torsional vibration tests. The density, moisture content and natural frequency of smaller specimens were also determined. The GLT values of the seven species are similar to those proposed by the revised authors for woods with comparable density and moisture content. The moduli of rigidity varied between 695 MPa and 2,807 MPa 695 MPa (E. cyclocarpum) y 2,807 MPa (T. chrysantha). The values for each species oscillate around the linear prediction proposed by the elastic model of the wood. The wood density and the natural frequency of vibrations in torsion are predictors of the dynamic modulus of rigidity with coefficients of determination of 0.98 and 0.81 respectively.]]></p></abstract>
<abstract abstract-type="short" xml:lang="es"><p><![CDATA[Resumen: El módulo de rigidez de la madera es útil para el cálculo estructural y la elaboración de productos derivados de la misma. El objetivo de esta investigación fue determinar los módulos de rigidez en el plano longitudinal tangencial (GLT) de siete especies de maderas mexicanas (Enterolobium cyclocarpum, Tabebuia donnell-smithii, T. rosea, Swietenia humilis, Lysiloma acapulcensis, Cordia elaeagnoides y T. chrysantha), realizando pruebas de vibraciones en torsión. También se determinó la densidad, el contenido de humedad y la frecuencia natural de probetas de pequeñas dimensiones. Los valores del GLT de las siete especies fueron similares a los módulos propuestos en estudios ya realizados con maderas de densidad y contenido de humedad comparables. Los módulos de rigidez variaron entre 695 MPa (E. cyclocarpum) y 2,807 MPa (T. chrysantha). Los valores de cada especie oscilaron alrededor de la predicción lineal propuesta a través del modelo elástico de la madera. La densidad y la frecuencia natural de vibraciones en torsión son predictores del módulo de rigidez dinámico con coeficientes de determinación de 0.98 y 0.81, respectivamente.]]></p></abstract>
<kwd-group>
<kwd lng="en"><![CDATA[Density]]></kwd>
<kwd lng="en"><![CDATA[humidity content]]></kwd>
<kwd lng="en"><![CDATA[torsional natural frequency]]></kwd>
<kwd lng="en"><![CDATA[mechanical characterization]]></kwd>
<kwd lng="es"><![CDATA[Densidad]]></kwd>
<kwd lng="es"><![CDATA[contenido de humedad]]></kwd>
<kwd lng="es"><![CDATA[frecuencia natural en torsión]]></kwd>
<kwd lng="es"><![CDATA[caracterización mecánica]]></kwd>
</kwd-group>
</article-meta>
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