<?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>S0012-73532023000200146</article-id>
<article-id pub-id-type="doi">10.15446/dyna.v90n226.107106</article-id>
<title-group>
<article-title xml:lang="en"><![CDATA[Study on stress variation law of hard concretion coal under the action of pick based on DYNA]]></article-title>
<article-title xml:lang="es"><![CDATA[Estudio sobre la ley de variación del estrés del carbón de concreción dura bajo la acción del pico basado en DYNA]]></article-title>
</title-group>
<contrib-group>
<contrib contrib-type="author">
<name>
<surname><![CDATA[Liu]]></surname>
<given-names><![CDATA[Xunan]]></given-names>
</name>
<xref ref-type="aff" rid="Aff"/>
</contrib>
<contrib contrib-type="author">
<name>
<surname><![CDATA[Zhang]]></surname>
<given-names><![CDATA[Yanpeng]]></given-names>
</name>
<xref ref-type="aff" rid="Aff"/>
</contrib>
<contrib contrib-type="author">
<name>
<surname><![CDATA[Wang]]></surname>
<given-names><![CDATA[Jie]]></given-names>
</name>
<xref ref-type="aff" rid="Aff"/>
</contrib>
<contrib contrib-type="author">
<name>
<surname><![CDATA[Li]]></surname>
<given-names><![CDATA[Hongye]]></given-names>
</name>
<xref ref-type="aff" rid="Aff"/>
</contrib>
<contrib contrib-type="author">
<name>
<surname><![CDATA[Ma]]></surname>
<given-names><![CDATA[Lianwei]]></given-names>
</name>
<xref ref-type="aff" rid="Aff"/>
</contrib>
</contrib-group>
<aff id="Af1">
<institution><![CDATA[,Liaoning Technical University  ]]></institution>
<addr-line><![CDATA[Fuxin ]]></addr-line>
<country>China</country>
</aff>
<aff id="Af2">
<institution><![CDATA[,CCTEG Taiyuan Research Institute  ]]></institution>
<addr-line><![CDATA[Taiyuan Shanxi]]></addr-line>
<country>China</country>
</aff>
<pub-date pub-type="pub">
<day>00</day>
<month>06</month>
<year>2023</year>
</pub-date>
<pub-date pub-type="epub">
<day>00</day>
<month>06</month>
<year>2023</year>
</pub-date>
<volume>90</volume>
<numero>226</numero>
<fpage>146</fpage>
<lpage>155</lpage>
<copyright-statement/>
<copyright-year/>
<self-uri xlink:href="http://www.scielo.org.co/scielo.php?script=sci_arttext&amp;pid=S0012-73532023000200146&amp;lng=en&amp;nrm=iso"></self-uri><self-uri xlink:href="http://www.scielo.org.co/scielo.php?script=sci_abstract&amp;pid=S0012-73532023000200146&amp;lng=en&amp;nrm=iso"></self-uri><self-uri xlink:href="http://www.scielo.org.co/scielo.php?script=sci_pdf&amp;pid=S0012-73532023000200146&amp;lng=en&amp;nrm=iso"></self-uri><abstract abstract-type="short" xml:lang="en"><p><![CDATA[Abstract Modeling and simulation of pick cutting hard concretion coal process are taken as a key link to analyze the stress variation law. To this aim, the properties of hard concretion coal in the target mining area were tested. Related model with high-quality common grid was generated using the mapping method through Hypermesh. the coal breaking process was performed using LS-DYNA, and the stress variation law of coal and hard concretion was analyzed. The results showed that the closer the action position to the middle point of long axis of hard concretion, the greater stress peak would be generated, stripping of the pick occurred when it acted on the 2/5 and 1/2 positions of the long axis. Using similarity theory, the model of hard concretion coal was made and the pick cutting experiment was performed. Compared with simulation torque result, the correctness of modeling and simulation has been verified.]]></p></abstract>
<abstract abstract-type="short" xml:lang="es"><p><![CDATA[Resumen El modelado y la simulación durante el corte de hulla son elementos clave para analizar las leyes de variación de las tensiones. Con este fin, se realizaron pruebas de rendimiento de carbón duro de la mina objetivo. Generación de modelos correlacionados con mallas comunes de alta calidad utilizando el método de mapeo de Hypermesh. LS-DYNA ha sido utilizado para analizar las fracturas de pico de carbón y las tensiones en el carbón y el hormigón. Los resultados muestran que cuanto más cerca del centro del eje mayor sea el pico de tensión. Los bloques duros se desprenden cuando hachas se encuentran en 1/2 y 2/5 del eje mayor. Se ha desarrollado un modelo de carbón endurecido utilizando la teoría de la similitud y se ha realizado un experimento de corte por pico. La corrección del modelado y la simulación se verificó mediante la comparación con los resultados de simulación.]]></p></abstract>
<kwd-group>
<kwd lng="en"><![CDATA[hard concretion]]></kwd>
<kwd lng="en"><![CDATA[coal]]></kwd>
<kwd lng="en"><![CDATA[finite element analysis]]></kwd>
<kwd lng="en"><![CDATA[stress variation law]]></kwd>
<kwd lng="en"><![CDATA[similarity theory]]></kwd>
<kwd lng="es"><![CDATA[concreción dura]]></kwd>
<kwd lng="es"><![CDATA[carbón]]></kwd>
<kwd lng="es"><![CDATA[análisis de elementos finitos]]></kwd>
<kwd lng="es"><![CDATA[ley de variación de estrés]]></kwd>
<kwd lng="es"><![CDATA[teoría de la similitude]]></kwd>
</kwd-group>
</article-meta>
</front><back>
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