{"id":13722,"date":"2022-04-25T10:50:40","date_gmt":"2022-04-25T08:50:40","guid":{"rendered":"https:\/\/fondation-grenoble-inp.fr\/?post_type=projet&#038;p=13722"},"modified":"2024-04-30T16:40:42","modified_gmt":"2024-04-30T14:40:42","slug":"methodes-novatrices-de-modelisation-de-lendommagement-des-aciers-par-erosion-de-cavitation","status":"publish","type":"projet","link":"https:\/\/fondation-grenoble-inp.fr\/en\/projet\/methodes-novatrices-de-modelisation-de-lendommagement-des-aciers-par-erosion-de-cavitation\/","title":{"rendered":"Innovative Methods for Modeling Cavitation Erosion Damage in Steel"},"content":{"rendered":"<p><strong>Axe du recherche du projet<\/strong> : Cavitation et mat\u00e9riaux<\/p>\n\n\n\n<p><strong>Porteurs du projet<\/strong> : <\/p>\n\n\n\n<p>Correspondants : <a href=\"https:\/\/www.linkedin.com\/in\/s-gaudion-consulting-engineer\/\" target=\"_blank\" rel=\"noreferrer noopener\">Sylvain Gaudion<\/a>, General Electric Renewable Energy &amp; <a href=\"https:\/\/simap.grenoble-inp.fr\/fr\/equipes\/m-fivel-marc-1\" target=\"_blank\" rel=\"noreferrer noopener\">Marc Fivel<\/a>, Directeur de recherche au Laboratoire SIMaP<\/p>\n\n\n\n<p>Doctorant&nbsp;: <a href=\"https:\/\/www.linkedin.com\/in\/julien-hofmann-541b9b145\/\" target=\"_blank\" rel=\"noreferrer noopener\">Julien Hofmann<\/a><\/p>\n\n\n\n<p><strong>Organisations associated with the project<\/strong> : <a href=\"https:\/\/simap.grenoble-inp.fr\" target=\"_blank\" rel=\"noreferrer noopener\">SIMaP<\/a>, <a href=\"http:\/\/www.legi.grenoble-inp.fr\/web\/\" target=\"_blank\" rel=\"noreferrer noopener\">LEGI<\/a>, <a href=\"https:\/\/www.ge.com\/fr\/content\/renewable-energy\" target=\"_blank\" rel=\"noreferrer noopener\">General Electric Renewable Energy<\/a><\/p>\n\n\n\n<p><strong>The project<\/strong> :<\/p>\n\n\n\n<p>L\u2019hydro\u00e9lectricit\u00e9 est \u00e0 ce jour la deuxi\u00e8me source de production d\u2019\u00e9lectricit\u00e9 en France gr\u00e2ce aux 2 300 installations pr\u00e9sentes sur le territoire fran\u00e7ais. Certains points de fonctionnement, pr\u00e9vus ou non initialement, entrainent des conditions hydrodynamiques sp\u00e9cifiques susceptibles de produire des ph\u00e9nom\u00e8ne de cavitation eux-m\u00eames \u00e0 l\u2019origine d\u2019endommagement d\u2019\u00e9rosion de cavitation engendr\u00e9 par les impacts r\u00e9p\u00e9t\u00e9s des bulles de vapeurs qui implosent \u00e0 proximit\u00e9 des aubes.<\/p>\n\n\n\n<p>Les cons\u00e9quences d\u2019un tel endommagement peuvent \u00eatre directes (modification de la rugosit\u00e9 de surface, perte de masse, propagation de fissures, etc.) ou bien indirectes (diminution du rendement, vibration m\u00e9canique, corrosion suite \u00e0 la rupture d\u2019un film passif, etc.).<\/p>\n\n\n\n<p><strong>Objectif du projet<\/strong> :<\/p>\n\n\n\n<p>L&rsquo;objectif du projet est d\u2019\u00e9tablir un mod\u00e8le d\u2019endommagement d\u2019\u00e9rosion par cavitation de nuances d\u2019acier super-martensitique X3CrNiMo13-4 et X4CrNiMo16-5-1 dans des conditions mod\u00e9lis\u00e9es en laboratoire. Afin de comprendre l\u2019influence de la microstructure sur les endommagements li\u00e9s la cavitation, deux \u00e9tats m\u00e9tallurgiques (QT780 et QT900) sont \u00e9tudi\u00e9s par nuance d\u2019aciers inoxydables.<\/p>\n\n\n\n<p>L\u2019\u00e9rosion de cavitation est g\u00e9n\u00e9r\u00e9e sur les mat\u00e9riaux \u00e0 l\u2019aide de deux dispositifs :<\/p>\n\n\n\n<ul><li>Un tunnel hydrodynamique pr\u00e9sent au laboratoire LEGI. La cavitation est g\u00e9n\u00e9r\u00e9e par une augmentation locale de la vitesse d&rsquo;un \u00e9coulement confin\u00e9 dans une veine hydraulique. Dans cette installation, la vitesse de l&rsquo;eau peut aller jusqu&rsquo;\u00e0 90m\/s.<\/li><\/ul>\n\n\n\n<ul><li>Un dispositif exp\u00e9rimental compos\u00e9 d\u2019un processeur \u00e0 ultrasons (sonotrode). Dans ce cas, la cavitation est g\u00e9n\u00e9r\u00e9e par les ondes acoustiques transmises dans l&rsquo;eau par la sonotrode. Dans ce dispositif, la vitesse du fluide est donc nulle mais la fr\u00e9quence des impacts est tr\u00e8s \u00e9lev\u00e9e.<\/li><\/ul>\n\n\n\n<p>Les caract\u00e9risations des endommagements sont men\u00e9es en parall\u00e8le :<\/p>\n\n\n\n<ul><li>En surface : analyse du changement de topologie de surface (profilom\u00e9trie, microscope \u00e9lectronique \u00e0 balayage, microscope \u00e0 forces atomiques)<\/li><li>En volume : observation de la propagation des fissures et des d\u00e9fauts (tomographie aux rayons-X : en laboratoire et \u00e0 l\u2019<a href=\"https:\/\/www.esrf.fr\/fr\/home\/about.html\" target=\"_blank\" rel=\"noreferrer noopener\">ESRF<\/a>).<\/li><\/ul>\n\n\n\n<p>L\u2019originalit\u00e9 du projet est que le dispositif \u00e0 ultrasons peut s&rsquo;installer dans un tomographe \u00e0 rayons X, en laboratoire ou bien \u00e0 l\u2019ESRF. Ce couplage moyen d\u2019essais\/caract\u00e9risation permet ainsi de r\u00e9aliser des observations <em>in-situ<\/em> des m\u00e9canismes d\u2019endommagement (\u00e9volution spatio-temporelle des fissures).<\/p>\n\n\n\n<p><strong>R\u00e9sultat attendu<\/strong> :<\/p>\n\n\n\n<p>La compr\u00e9hension des m\u00e9canismes d\u2019endommagement doit permettre \u00e0 General Electric de mieux s\u00e9lectionner les mat\u00e9riaux en fonction des conditions de sollicitations attendues ou bien de d\u00e9velopper des rev\u00eatements pour limiter les endommagements.<\/p>\n\n\n\n<p><strong>Publications associ\u00e9es<\/strong> :<\/p>\n\n\n\n<p>Article scientifique dans la revue Physics of Fluid : <a href=\"https:\/\/fondation-grenoble-inp.fr\/wp-content\/uploads\/2023\/03\/Comparison-of-acoustic-and-hydrodynamic-cavitation-Material-point-of-view.pdf\" target=\"_blank\" rel=\"noreferrer noopener\">Comparison of acoustic and hydrodynamic cavitation: Material point of view<\/a>, Julien Hofmann<\/p>\n\n\n\n<p>Th\u00e8se<em>&nbsp;<\/em>: Caract\u00e9risation et mod\u00e9lisation des m\u00e9canismes d\u2019endommagement des mat\u00e9riaux par la cavitation, <a href=\"https:\/\/www.linkedin.com\/in\/julien-hofmann-541b9b145\/\" target=\"_blank\" rel=\"noreferrer noopener\">Julien Hofmann<\/a><\/p>\n\n\n\n<p>Article de vulgarisation dans The Conversation : <a href=\"https:\/\/fondation-grenoble-inp.fr\/wp-content\/uploads\/2023\/03\/Centrales-hydroelectriques-comprendre-la-fissuration-des-turbines-pour-prolonger-leur-duree-de-vie.pdf\" target=\"_blank\" rel=\"noreferrer noopener\">Centrales hydro\u00e9lectriques&nbsp;: comprendre la fissuration des turbines pour prolonger leur dur\u00e9e&nbsp;de&nbsp;vie<\/a>, Julien Hofmann<\/p>","protected":false},"excerpt":{"rendered":"<p>Axe du recherche du projet : Cavitation et mat\u00e9riaux Porteurs du projet : Correspondants : Sylvain Gaudion, General Electric Renewable Energy &amp; Marc Fivel, Directeur de recherche au Laboratoire SIMaP Doctorant&nbsp;: Julien Hofmann Organismes associ\u00e9s au projet : SIMaP, LEGI, General Electric Renewable Energy Le projet : L\u2019hydro\u00e9lectricit\u00e9 est \u00e0 ce jour la deuxi\u00e8me source [&hellip;]<\/p>","protected":false},"featured_media":12876,"template":"","acf":[],"yoast_head":"<!-- This site is optimized with the Yoast SEO plugin v18.0 - https:\/\/yoast.com\/wordpress\/plugins\/seo\/ -->\n<title>M\u00e9thodes novatrices de l\u2019endommagement des aciers par \u00e9rosion de cavitation<\/title>\n<meta name=\"description\" content=\"Dans le cadre de sa th\u00e8se, Julien Hofmann cherche \u00e0 reproduire l&#039;endommagement des assez pr\u00e9sent dans les installations hydro\u00e9lectriques.\" \/>\n<meta name=\"robots\" content=\"index, follow, max-snippet:-1, max-image-preview:large, max-video-preview:-1\" \/>\n<link rel=\"canonical\" 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