<?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>S0012-73532020000200052</article-id>
<article-id pub-id-type="doi">10.15446/dyna.v87n213.83469</article-id>
<title-group>
<article-title xml:lang="en"><![CDATA[Modification of Charpy machine for the acquisition of stress-strain curve in thermoplastics]]></article-title>
<article-title xml:lang="es"><![CDATA[Modificación de máquina Charpy para la adquisición de la curva esfuerzo-deformación en termoplásticos]]></article-title>
</title-group>
<contrib-group>
<contrib contrib-type="author">
<name>
<surname><![CDATA[Zabala-Gualtero]]></surname>
<given-names><![CDATA[Luis Miguel]]></given-names>
</name>
<xref ref-type="aff" rid="Aff"/>
</contrib>
<contrib contrib-type="author">
<name>
<surname><![CDATA[Figuero-López]]></surname>
<given-names><![CDATA[Ulises]]></given-names>
</name>
<xref ref-type="aff" rid="Aff"/>
</contrib>
<contrib contrib-type="author">
<name>
<surname><![CDATA[Guevara-Morales]]></surname>
<given-names><![CDATA[Andrea]]></given-names>
</name>
<xref ref-type="aff" rid="Aff"/>
</contrib>
<contrib contrib-type="author">
<name>
<surname><![CDATA[Rojo-Valerio]]></surname>
<given-names><![CDATA[Alejandro]]></given-names>
</name>
<xref ref-type="aff" rid="Aff"/>
</contrib>
</contrib-group>
<aff id="Af1">
<institution><![CDATA[,Escuela de Ingeniería y Ciencias Tecnológico de Monterrey ]]></institution>
<addr-line><![CDATA[Atizapán de Zaragoza ]]></addr-line>
<country>Mexico</country>
</aff>
<aff id="Af2">
<institution><![CDATA[,Escuela de Ingeniería y Ciencias Tecnológico de Monterrey ]]></institution>
<addr-line><![CDATA[Toluca de Lerdo ]]></addr-line>
<country>Mexico</country>
</aff>
<pub-date pub-type="pub">
<day>00</day>
<month>06</month>
<year>2020</year>
</pub-date>
<pub-date pub-type="epub">
<day>00</day>
<month>06</month>
<year>2020</year>
</pub-date>
<volume>87</volume>
<numero>213</numero>
<fpage>52</fpage>
<lpage>60</lpage>
<copyright-statement/>
<copyright-year/>
<self-uri xlink:href="http://www.scielo.org.co/scielo.php?script=sci_arttext&amp;pid=S0012-73532020000200052&amp;lng=en&amp;nrm=iso"></self-uri><self-uri xlink:href="http://www.scielo.org.co/scielo.php?script=sci_abstract&amp;pid=S0012-73532020000200052&amp;lng=en&amp;nrm=iso"></self-uri><self-uri xlink:href="http://www.scielo.org.co/scielo.php?script=sci_pdf&amp;pid=S0012-73532020000200052&amp;lng=en&amp;nrm=iso"></self-uri><abstract abstract-type="short" xml:lang="en"><p><![CDATA[Abstract Simulations of impact events in the automotive industry are now a common practice. Vehicle crashworthiness simulations on plastic components cover a wide range of strain rates from 0.01-500 s-1. Because plastic mechanical properties are very dependent on strain rate, developing experimental methods for generating stress-strain curves at this strain rate range is of great technological importance. In this paper, a modified Charpy machine capable of acquiring useful information to obtain the stress-strain curve is presented. Strain rates between 300-400 s-1 were achieved. Three thermoplastics were tested: high-density polyethylene, polypropylene-copolymer and polypropylene-homopolymer. Impact simulations using LS-DYNA were performed using the acquired high-strain rates stress-strain curves and compared with experimental data. Simulations using stress-strain curves from quasi-static tests were also performed for comparison against high-speed. Very good agreement between the simulation and experimental results was found when the ASTM D1822 type S specimen was used for testing each material.]]></p></abstract>
<abstract abstract-type="short" xml:lang="es"><p><![CDATA[Resumen Las simulaciones de impacto en la industria automotriz son ahora una práctica común. Modelaciones de componentes plásticos en choques de vehículos cubren una amplia gama de velocidades de deformaciones de 0.01-500 s-1. Debido a que las propiedades mecánicas de los plásticos dependen de la velocidad de deformación, el desarrollo de métodos experimentales para generar curvas de esfuerzo-deformación en este rango de velocidad es de gran importancia tecnológica. En este artículo, se presenta una máquina Charpy modificada capaz de adquirir información útil para obtener la curva de esfuerzo-deformación. Se lograron velocidades de deformación entre 300-400 s-1. Se probaron tres termoplásticos: polietileno de alta densidad, polipropileno copolímero y polipropileno homopolímero. Simulaciones de impacto utilizando LS-DYNA se realizaron utilizando las curvas de alta velocidad de deformación adquiridas y se compararon con datos experimentales. También se realizaron simulaciones utilizando curvas de esfuerzo-deformación de pruebas cuasi-estáticas para comparación contra las de alta velocidad. Se encontraron muy buenos resultados entre la simulación y los resultados experimentales cuando se usó la muestra ASTM D1822 tipo S para analizar cada material.]]></p></abstract>
<kwd-group>
<kwd lng="en"><![CDATA[mechanical properties]]></kwd>
<kwd lng="en"><![CDATA[thermoplastics]]></kwd>
<kwd lng="en"><![CDATA[tension-impact testing equipment]]></kwd>
<kwd lng="en"><![CDATA[computational simulation LS-DYNA]]></kwd>
<kwd lng="es"><![CDATA[propiedades mecánicas]]></kwd>
<kwd lng="es"><![CDATA[termoplásticos]]></kwd>
<kwd lng="es"><![CDATA[equipo de pruebas de impacto-tensión]]></kwd>
<kwd lng="es"><![CDATA[simulación computacional en LS-DYNA]]></kwd>
</kwd-group>
</article-meta>
</front><back>
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