{"id":89422,"date":"2018-03-10T00:14:33","date_gmt":"2018-03-10T00:14:33","guid":{"rendered":"https:\/\/www.deberes.net\/tesis\/sin-categoria\/estudio-mediante-tecnicas-de-aproximacion-local-de-la-fractura-de-aceros-inoxidables-austenoferriticos-envejecidos\/"},"modified":"2018-03-10T00:14:33","modified_gmt":"2018-03-10T00:14:33","slug":"estudio-mediante-tecnicas-de-aproximacion-local-de-la-fractura-de-aceros-inoxidables-austenoferriticos-envejecidos","status":"publish","type":"post","link":"https:\/\/www.deberes.net\/tesis\/ciencias-tecnologicas\/estudio-mediante-tecnicas-de-aproximacion-local-de-la-fractura-de-aceros-inoxidables-austenoferriticos-envejecidos\/","title":{"rendered":"Estudio mediante t\u00e9cnicas de aproximaci\u00f3n local de la fractura de aceros inoxidables austenoferriticos envejecidos"},"content":{"rendered":"<h2>Tesis doctoral de <strong> Jes\u00fas Manuel Alegre Calderon <\/strong><\/h2>\n<p>El estudio efectuado aborda el an\u00e1lisis del efecto del envejecimiento de los aceros austeno-ferr\u00edticos cuando su temperatura de trabajo est\u00e9 comprendida entre 280 y 400\u00c2\u00bac. Este fen\u00f3meno produce una fragilizaci\u00f3n de la fase ferr\u00edtica que se traduce en una p\u00e9rdida de capacidad resistente el material, tanto en el comportamiento elasto-pl\u00e1stico como en rotura.  en el estudio efectuado se han aplicado ampliamente las t\u00e9cncias de aproximaci\u00f3n local de la fractura d\u00factil, en particular el modelo constitutivo de gurson-tvergaard. Se presenta el desarrollo de una metodolog\u00eda de simulaci\u00f3n num\u00e9rica que permite obtener los par\u00e1metros necesarios para simular el comportamiento hasta rotura de estos aceros, en funci\u00f3n del contenido en ferrita, entre el 12% y el 22%, de la triaxialidad de tensiones y del tiempo de envejecimiento. El desarrollo de la metodolog\u00eda de simulaci\u00f3n num\u00e9rica est\u00e1 apoyado en un amplio programa experimental con probetas de tracci\u00f3n en talladas axisim\u00e9tricas envejecidas hasta 14800 horas a 400\u00c2\u00bac. La aplicaci\u00f3n de la metadolog\u00eda presentada al estudio de probetas fisuradas, para predecir su comportamiento en fractura, constituye una parte importante en el an\u00e1lisis en el que se han obtenido excelentes resultados. Para aportar sentido f\u00edsico a los par\u00e1metros num\u00e9ricos se ha efectuado un interesante estudio fractogr\u00e1fico que relaciona dichos par\u00e1metros con la cantidad de ferrita rota presente en las superficie de fractura.  despu\u00e9s de un exhaustivo an\u00e1lisis de resultados experimentales y num\u00e9ricos se ha elaborado un modelo de previsi\u00f3n que permite simular el comportamiento hasta rotura en las diferentes condiciones analizados que constituye una potente herramienta para el dise\u00f1o de nuevos componentes o para el estudio de los ya existentes.<\/p>\n<p>&nbsp;<\/p>\n<h3>Datos acad\u00e9micos de la tesis doctoral \u00ab<strong>Estudio mediante t\u00e9cnicas de aproximaci\u00f3n local de la fractura de aceros inoxidables austenoferriticos envejecidos<\/strong>\u00ab<\/h3>\n<ul>\n<li><strong>T\u00edtulo de la tesis:<\/strong>\u00a0 Estudio mediante t\u00e9cnicas de aproximaci\u00f3n local de la fractura de aceros inoxidables austenoferriticos envejecidos <\/li>\n<li><strong>Autor:<\/strong>\u00a0 Jes\u00fas Manuel Alegre Calderon <\/li>\n<li><strong>Universidad:<\/strong>\u00a0 Cantabria<\/li>\n<li><strong>Fecha de lectura de la tesis:<\/strong>\u00a0 22\/03\/2001<\/li>\n<\/ul>\n<p>&nbsp;<\/p>\n<h3>Direcci\u00f3n y tribunal<\/h3>\n<ul>\n<li><strong>Director de la tesis<\/strong>\n<ul>\n<li>Federico Gutierrez Solana Salcedo<\/li>\n<\/ul>\n<\/li>\n<li><strong>Tribunal<\/strong>\n<ul>\n<li>Presidente del tribunal: Miguel angel Astiz suarez <\/li>\n<li>i\u00f1aki Gorrochategui s\u00e1nchez (vocal)<\/li>\n<li>Francisco Javier Belzunce varela (vocal)<\/li>\n<li> Mart\u00ednez mart\u00ednez Jos\u00e9 Antonio (vocal)<\/li>\n<\/ul>\n<\/li>\n<\/ul>\n<p>&nbsp;<\/p>\n","protected":false},"excerpt":{"rendered":"<p>Tesis doctoral de Jes\u00fas Manuel Alegre Calderon El estudio efectuado aborda el an\u00e1lisis del efecto del envejecimiento de los aceros [&hellip;]<\/p>\n","protected":false},"author":1,"featured_media":0,"comment_status":"open","ping_status":"open","sticky":false,"template":"","format":"standard","meta":{"site-sidebar-layout":"default","site-content-layout":"","ast-site-content-layout":"","site-content-style":"default","site-sidebar-style":"default","ast-global-header-display":"","ast-banner-title-visibility":"","ast-main-header-display":"","ast-hfb-above-header-display":"","ast-hfb-below-header-display":"","ast-hfb-mobile-header-display":"","site-post-title":"","ast-breadcrumbs-content":"","ast-featured-img":"","footer-sml-layout":"","theme-transparent-header-meta":"","adv-header-id-meta":"","stick-header-meta":"","header-above-stick-meta":"","header-main-stick-meta":"","header-below-stick-meta":"","astra-migrate-meta-layouts":"default","ast-page-background-enabled":"default","ast-page-background-meta":{"desktop":{"background-color":"var(--ast-global-color-4)","background-image":"","background-repeat":"repeat","background-position":"center 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