<?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>0012-7353</journal-id>
<journal-title><![CDATA[DYNA]]></journal-title>
<abbrev-journal-title><![CDATA[Dyna rev.fac.nac.minas]]></abbrev-journal-title>
<issn>0012-7353</issn>
<publisher>
<publisher-name><![CDATA[Universidad Nacional de Colombia]]></publisher-name>
</publisher>
</journal-meta>
<article-meta>
<article-id>S0012-73532021000100055</article-id>
<article-id pub-id-type="doi">10.15446/dyna.v88n216.89446</article-id>
<title-group>
<article-title xml:lang="en"><![CDATA[Comparative study of stress relaxation phenomenological constitutive modeling of carbon black-reinforced natural rubber-based compounds]]></article-title>
<article-title xml:lang="es"><![CDATA[Estudio comparativo de modelos constitutivos fenomenológicos de compuestos de caucho natural reforzados con negro de humo sometidos a relajación de esfuerzos]]></article-title>
</title-group>
<contrib-group>
<contrib contrib-type="author">
<name>
<surname><![CDATA[Guzmán-Sánchez]]></surname>
<given-names><![CDATA[Manuel Alberto]]></given-names>
</name>
<xref ref-type="aff" rid="Aff"/>
</contrib>
</contrib-group>
<aff id="Af1">
<institution><![CDATA[,Universidad de Antioquia Facultad de Ingeniería ]]></institution>
<addr-line><![CDATA[Medellín ]]></addr-line>
<country>Colombia</country>
</aff>
<pub-date pub-type="pub">
<day>00</day>
<month>03</month>
<year>2021</year>
</pub-date>
<pub-date pub-type="epub">
<day>00</day>
<month>03</month>
<year>2021</year>
</pub-date>
<volume>88</volume>
<numero>216</numero>
<fpage>55</fpage>
<lpage>61</lpage>
<copyright-statement/>
<copyright-year/>
<self-uri xlink:href="http://www.scielo.org.co/scielo.php?script=sci_arttext&amp;pid=S0012-73532021000100055&amp;lng=en&amp;nrm=iso"></self-uri><self-uri xlink:href="http://www.scielo.org.co/scielo.php?script=sci_abstract&amp;pid=S0012-73532021000100055&amp;lng=en&amp;nrm=iso"></self-uri><self-uri xlink:href="http://www.scielo.org.co/scielo.php?script=sci_pdf&amp;pid=S0012-73532021000100055&amp;lng=en&amp;nrm=iso"></self-uri><abstract abstract-type="short" xml:lang="en"><p><![CDATA[Abstract Viscoelastic properties of rubber materials are due to the combination of the dual response as an elastic solid and a viscous fluid. This behavior yields in time-dependent mechanical properties; thus, phenomena such as stress relaxation, creep, energy dissipation, hysteresis, and strain rate are observed. In this study, three different carbon black-reinforced natural rubber compounds were experimentally evaluated under stress relaxation and several linear phenomenological constitutive models were fitted to evaluate their viscoelastic parameters. It was observed that both the elastic and viscous parameters increase in a non-linear relation as the strain and carbon black content increase, and the viscous parameters were dependent on the configuration of the model. Maxwell and Zener models exhibited fitting values of 76.08 and 95.10%, respectively, while the Wiechert model showed the best fitting values (above 98.40%) and can be adequately used to estimate the relaxation process of carbon black-reinforced natural rubber applications.]]></p></abstract>
<abstract abstract-type="short" xml:lang="es"><p><![CDATA[Resumen Las propiedades viscoelásticas del caucho son debidas a la combinación de la respuesta como un sólido elástico y un fluido viscoso. Este comportamiento produce propiedades mecánicas dependientes del tiempo; observando fenómenos como la relajación de esfuerzos, fluencia, disipación de energía, histéresis y tasa de deformación. En este estudio, se evaluaron tres compuestos diferentes de caucho natural reforzado con negro de humo sometidos a relajación de esfuerzos y se ajustaron varios modelos constitutivos fenomenológicos lineales para evaluar sus parámetros viscoelásticos. Se observó que los parámetros elásticos como viscosos aumentan en una relación no lineal a medida que aumenta la deformación y el contenido de negro de humo, y los parámetros viscosos dependen de la configuración del modelo. Los modelos Maxwell y Zener exhibieron valores de ajuste de 76.08 y 95.10% respectivamente, mientras que el modelo de Wiechert mostró los mejores valores de ajuste (superiores a 98.40%) y puede usarse adecuadamente para estimar el proceso de relajación de aplicaciones de caucho natural reforzado con negro de humo.]]></p></abstract>
<kwd-group>
<kwd lng="en"><![CDATA[stress relaxation]]></kwd>
<kwd lng="en"><![CDATA[constitutive modeling]]></kwd>
<kwd lng="en"><![CDATA[viscoelastic]]></kwd>
<kwd lng="en"><![CDATA[natural rubber]]></kwd>
<kwd lng="es"><![CDATA[relajación de esfuerzos]]></kwd>
<kwd lng="es"><![CDATA[modelos constitutivos]]></kwd>
<kwd lng="es"><![CDATA[viscoelasticidad]]></kwd>
<kwd lng="es"><![CDATA[caucho natural]]></kwd>
</kwd-group>
</article-meta>
</front><back>
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