<?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>2071-0054</journal-id>
<journal-title><![CDATA[Revista Ciencias Técnicas Agropecuarias]]></journal-title>
<abbrev-journal-title><![CDATA[Rev Cie Téc Agr]]></abbrev-journal-title>
<issn>2071-0054</issn>
<publisher>
<publisher-name><![CDATA[Universidad Agraria de La Habana]]></publisher-name>
</publisher>
</journal-meta>
<article-meta>
<article-id>S2071-00542019000200001</article-id>
<title-group>
<article-title xml:lang="en"><![CDATA[Simulation of Clay Soil De-Compaction Using Discrete Element Method]]></article-title>
<article-title xml:lang="es"><![CDATA[Simulación de la descompactación de un suelo arcilloso empleando el método de elementos discretos]]></article-title>
</title-group>
<contrib-group>
<contrib contrib-type="author">
<name>
<surname><![CDATA[López-Bravo]]></surname>
<given-names><![CDATA[Elvis]]></given-names>
</name>
<xref ref-type="aff" rid="Aff"/>
</contrib>
<contrib contrib-type="author">
<name>
<surname><![CDATA[Tijskens]]></surname>
<given-names><![CDATA[Engelbert]]></given-names>
</name>
<xref ref-type="aff" rid="Aff"/>
</contrib>
<contrib contrib-type="author">
<name>
<surname><![CDATA[González-Cueto]]></surname>
<given-names><![CDATA[Omar]]></given-names>
</name>
<xref ref-type="aff" rid="Aff"/>
</contrib>
<contrib contrib-type="author">
<name>
<surname><![CDATA[Herrera-Suárez]]></surname>
<given-names><![CDATA[Miguel]]></given-names>
</name>
<xref ref-type="aff" rid="Aff"/>
</contrib>
<contrib contrib-type="author">
<name>
<surname><![CDATA[Lorenzo-Rojas]]></surname>
<given-names><![CDATA[José Dasiell]]></given-names>
</name>
<xref ref-type="aff" rid="Aff"/>
</contrib>
<contrib contrib-type="author">
<name>
<surname><![CDATA[Ramon]]></surname>
<given-names><![CDATA[Herman]]></given-names>
</name>
<xref ref-type="aff" rid="Aff"/>
</contrib>
</contrib-group>
<aff id="Af1">
<institution><![CDATA[,Universidad Central de las Villas &#8220;Marta Abreu&#8221; Facultad de Ciencias Agrícolas Departamento de Ingeniería Agrícola]]></institution>
<addr-line><![CDATA[Santa Clara Villa Clara]]></addr-line>
<country>Cuba</country>
</aff>
<aff id="Af2">
<institution><![CDATA[,Catholic University of Leuven Faculty of Bioscience Engineering Department of Biosystems]]></institution>
<addr-line><![CDATA[Kasteelpark Arenberg 30 B-3001 Heverlee]]></addr-line>
<country>Belgium</country>
</aff>
<pub-date pub-type="pub">
<day>00</day>
<month>06</month>
<year>2019</year>
</pub-date>
<pub-date pub-type="epub">
<day>00</day>
<month>06</month>
<year>2019</year>
</pub-date>
<volume>28</volume>
<numero>2</numero>
<copyright-statement/>
<copyright-year/>
<self-uri xlink:href="http://scielo.sld.cu/scielo.php?script=sci_arttext&amp;pid=S2071-00542019000200001&amp;lng=en&amp;nrm=iso"></self-uri><self-uri xlink:href="http://scielo.sld.cu/scielo.php?script=sci_abstract&amp;pid=S2071-00542019000200001&amp;lng=en&amp;nrm=iso"></self-uri><self-uri xlink:href="http://scielo.sld.cu/scielo.php?script=sci_pdf&amp;pid=S2071-00542019000200001&amp;lng=en&amp;nrm=iso"></self-uri><abstract abstract-type="short" xml:lang="en"><p><![CDATA[ABSTRACT Draft force prediction and soil mechanical behavior during soil de-compaction was implemented by using the Discrete Element Method. The model parameters were defined as a function of the mechanical properties a clay soil, previously obtained by laboratory tests. The properties used by the model are cohesion, adhesion, internal friction, external friction, Young&#8217;s modulus and Poisson&#8217;s coefficient. The effect of the subsoiler shape variation was simulated under dry-compacted soil conditions, showing clear variations in forces related with the tool geometry. Increasing in complexity of the tool geometry the simulation, the model showed advantages in terms of demanded pressure and volume of soil disrupted. The soil de-compaction with hardpan formation was also simulated by introducing two different compacted soil sections in the virtual block. The compaction level was defined by two set of micro-particles with different density resulting from modifying the soil dry bulk density at the model macro-parameter. The simulation shows the feasibility of modelling separately the forces demanded for the different part of the tillage tool and the soil particle pattern of movement during the operation.]]></p></abstract>
<abstract abstract-type="short" xml:lang="es"><p><![CDATA[RESUMEN La predicción de la fuerza de tiro y la dinámica de operaciones de descompactación de suelo fue realizada empleando el Método de los Elementos Discretos. Los parámetros del modelo fueron definidos en función de las propiedades mecánicas de un suelo arcilloso, previamente obtenidos mediante ensayos de laboratorio. Las propiedades empleadas en el modelo fueron: cohesión, adhesión, fricción interna, fricción externa, el módulo de Young y el coeficiente de Poisson. El efecto de la variación de la forma del subsolador fue simulado en condiciones de suelo compacto y seco, mostrando claras variaciones en la demanda de fuerza respecto a la geometría de la herramienta. Con el aumento en la complejidad geométrica de la herramienta, el modelo mostró ventajas en términos de demandada de fuerza y volumen de suelo removido. La descompactación de un suelo con formaciones de hardpan se simuló con el empleo de dos secciones con diferente compactación en un mismo bloque virtual. El nivel de compactación fue obtenido mediante el empleo de arreglos de partículas con diferente densidad. La simulación muestra la viabilidad del modelo para determinar por separado las demandas de fuerza en las diferentes partes del subsolador. Posibilita además establecer el patrón de tensiones en dirección vertical sobre las partículas en el piso de labranza.]]></p></abstract>
<kwd-group>
<kwd lng="en"><![CDATA[Tillage]]></kwd>
<kwd lng="en"><![CDATA[prediction]]></kwd>
<kwd lng="en"><![CDATA[friction]]></kwd>
<kwd lng="en"><![CDATA[compaction]]></kwd>
<kwd lng="en"><![CDATA[implement]]></kwd>
<kwd lng="es"><![CDATA[Labranza]]></kwd>
<kwd lng="es"><![CDATA[predicción]]></kwd>
<kwd lng="es"><![CDATA[fricción]]></kwd>
<kwd lng="es"><![CDATA[compactación]]></kwd>
<kwd lng="es"><![CDATA[apero]]></kwd>
</kwd-group>
</article-meta>
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