{"id":1682,"date":"2025-04-15T18:04:00","date_gmt":"2025-04-15T16:04:00","guid":{"rendered":"https:\/\/www.minesparis.psl.eu\/cmat\/?post_type=actualites&#038;p=1682"},"modified":"2025-09-15T18:12:12","modified_gmt":"2025-09-15T16:12:12","slug":"julien-richard-etudiant-en-mastere-dms-au-centre-des-materiaux-a-recu-le-prix-fermi","status":"publish","type":"actualites","link":"https:\/\/www.minesparis.psl.eu\/cmat\/actualites\/julien-richard-etudiant-en-mastere-dms-au-centre-des-materiaux-a-recu-le-prix-fermi\/","title":{"rendered":"Julien RICHARD, \u00e9tudiant en mast\u00e8re DMS au Centre des Mat\u00e9riaux, a re\u00e7u le prix FERMI"},"content":{"rendered":"\n<div class=\"container block-full-largeur\">\n\t<div class=\"row mt-4\">\n\t\t<div class=\"col-md-12\">\n\t\t\t<h2 style=\"text-align: justify;\">Le prix FERMI<\/h2>\n<p style=\"text-align: justify;\">Cr\u00e9\u00e9 par la <strong data-start=\"184\" data-end=\"261\">F\u00e9d\u00e9ration pour l\u2019Enseignement et la Recherche sur la M\u00e9tallurgie (FERMI)<\/strong>, le <strong data-start=\"266\" data-end=\"287\">prix Master FERMI<\/strong> distingue chaque ann\u00e9e un(e) \u00e9tudiant(e) de niveau master pour la qualit\u00e9 scientifique et l\u2019originalit\u00e9 de ses travaux dans le domaine de la m\u00e9tallurgie et des mat\u00e9riaux. La f\u00e9d\u00e9ration FERMI rassemble les principaux acteurs acad\u00e9miques et industriels de la m\u00e9tallurgie en France, avec pour mission de renforcer les liens entre recherche, enseignement et applications industrielles. Ce prix vise ainsi \u00e0 valoriser les jeunes talents qui contribuent au d\u00e9veloppement de solutions innovantes pour la conception, la caract\u00e9risation et la mod\u00e9lisation des mat\u00e9riaux.<\/p>\n<h2>Travaux de Julien Richard<\/h2>\n<p style=\"text-align: justify;\">Ce travail porte sur la digitalisation d\u2019un mat\u00e9riau fortement h\u00e9t\u00e9rog\u00e8ne : les aciers s\u00e9gr\u00e9g\u00e9s dans les pi\u00e8ces forg\u00e9es de grande dimension utilis\u00e9es dans l\u2019industrie nucl\u00e9aire. Un jumeau num\u00e9rique a \u00e9t\u00e9 d\u00e9velopp\u00e9 dans le but de caract\u00e9riser le comportement m\u00e9canique d\u2019un acier pr\u00e9sentant des h\u00e9t\u00e9rog\u00e9n\u00e9it\u00e9s m\u00e9soscopiques en concentration d\u2019\u00e9l\u00e9ments d\u2019alliage, appel\u00e9es s\u00e9gr\u00e9gations. Ceci a \u00e9t\u00e9 r\u00e9alis\u00e9 en \u00e9laborant une strat\u00e9gie innovante de dialogue entre exp\u00e9rimentations et simulations num\u00e9riques.\nPour ce faire, des \u00e9prouvettes de traction de tr\u00e8s faible \u00e9paisseur ont pr\u00e9alablement \u00e9t\u00e9 soumises \u00e0 une attaque chimique au Nital, r\u00e9v\u00e9lant le niveau de s\u00e9gr\u00e9gation qui appara\u00eet comme un niveau de gris optique en surface. Ces h\u00e9t\u00e9rog\u00e9n\u00e9it\u00e9s m\u00e9soscopiques sont ensuite caract\u00e9ris\u00e9es et num\u00e9ris\u00e9es spatialement dans le volume de l\u2019\u00e9prouvette (1). Des essais de traction, instrument\u00e9s et coupl\u00e9s \u00e0 un suivi par corr\u00e9lation d\u2019images num\u00e9riques (DIC), ont permis d\u2019extraire les champs de d\u00e9formation h\u00e9t\u00e9rog\u00e8ne associ\u00e9s \u00e0 chaque essai (2). D\u2019autre part, la m\u00e9thode des \u00e9l\u00e9ments finis (EF) a \u00e9t\u00e9 utilis\u00e9e pour simuler le comportement m\u00e9canique h\u00e9t\u00e9rog\u00e8ne des \u00e9prouvettes de traction, les param\u00e8tres de la loi de comportement \u00e9lasto-plastique \u00e9tant suppos\u00e9s variables dans l\u2019espace, et index\u00e9 sur le niveau de s\u00e9gr\u00e9gation locale (3). Apr\u00e8s avoir transf\u00e9r\u00e9 les champs de s\u00e9gr\u00e9gation sur les \u00e9prouvettes num\u00e9riques, il a \u00e9t\u00e9 possible de comparer les champs de d\u00e9formation exp\u00e9rimentaux et les champs de d\u00e9formation simul\u00e9s (4). Cette comparaison a permis d\u2019identifier la relation entre les param\u00e8tres de la loi de comportement du mod\u00e8le EF et le niveau de s\u00e9gr\u00e9gation local du mat\u00e9riau, en faisant appel \u00e0 un algorithme d\u2019optimisation cherchant \u00e0 minimiser l\u2019\u00e9cart entre les champs de d\u00e9formation simul\u00e9s et exp\u00e9rimentaux (5).L\u2019ensemble de ce travail a ainsi abouti \u00e0 la conception d\u2019un jumeau num\u00e9rique performant permettant d\u2019identifier et de simuler le comportement m\u00e9canique d\u2019aciers s\u00e9gr\u00e9g\u00e9s afin de reproduire les r\u00e9sultats exp\u00e9rimentaux. La m\u00e9thodologie d\u00e9velopp\u00e9e durant ce stage peut \u00eatre \u00e9tendue plus largement \u00e0 d\u2019autres mat\u00e9riaux pr\u00e9sentant des h\u00e9t\u00e9rog\u00e9n\u00e9it\u00e9s locales \u00e0 l\u2019\u00e9chelle m\u00e9soscopique.<\/p>\n\t\t<\/div>\n\t<\/div>\n<\/div>\n\n\n<div class=\"container block-full-largeur\">\n\t<div class=\"row mt-4\">\n\t\t<div class=\"col-md-12\">\n\t\t\t<p><img loading=\"lazy\" decoding=\"async\" src=\"https:\/\/www.minesparis.psl.eu\/cmat\/wp-content\/uploads\/sites\/8\/2025\/09\/illustration-stage-jrichard-pmf2025_3-300x145.png\" alt=\"\" width=\"1053\" height=\"509\" class=\" wp-image-1683 aligncenter\" srcset=\"https:\/\/www.minesparis.psl.eu\/cmat\/wp-content\/uploads\/sites\/25\/2025\/09\/illustration-stage-jrichard-pmf2025_3-300x145.png 300w, https:\/\/www.minesparis.psl.eu\/cmat\/wp-content\/uploads\/sites\/25\/2025\/09\/illustration-stage-jrichard-pmf2025_3-1024x494.png 1024w, https:\/\/www.minesparis.psl.eu\/cmat\/wp-content\/uploads\/sites\/25\/2025\/09\/illustration-stage-jrichard-pmf2025_3-768x371.png 768w, https:\/\/www.minesparis.psl.eu\/cmat\/wp-content\/uploads\/sites\/25\/2025\/09\/illustration-stage-jrichard-pmf2025_3-1536x741.png 1536w, https:\/\/www.minesparis.psl.eu\/cmat\/wp-content\/uploads\/sites\/25\/2025\/09\/illustration-stage-jrichard-pmf2025_3-1300x627.png 1300w, https:\/\/www.minesparis.psl.eu\/cmat\/wp-content\/uploads\/sites\/25\/2025\/09\/illustration-stage-jrichard-pmf2025_3.png 2000w\" sizes=\"auto, (max-width: 1053px) 100vw, 1053px\" \/><\/p>\n\t\t<\/div>\n\t<\/div>\n<\/div>\n\n\n<div class=\"container block-full-largeur\">\n\t<div class=\"row mt-4\">\n\t\t<div class=\"col-md-12\">\n\t\t\t<p style=\"text-align: justify;\">Julien a r\u00e9alis\u00e9 son stage au Centre des Mat\u00e9riaux sous la responsabilit\u00e9 de Pierre Kerfriden, Jacques Besson, Basile Marchand, R\u00e9gis Kenko, Eric Andrieu (CIRIMAT) et Pierre Joly (Framatome). Il est ing\u00e9nieur ENSIACET et poursuit actuellement sa formation par la recherche \u00e0 l\u2019IRCP Chimie ParisTech.<\/p>\n<p style=\"text-align: center;\"><a href=\"https:\/\/fermi.cnrs.fr\/\" target=\"_blank\" class=\"button-mines btn-bleu flech lf-blanc\" rel=\"noopener\">Site internet FERMI<\/a><\/p>\n\t\t<\/div>\n\t<\/div>\n<\/div>","protected":false},"featured_media":1684,"template":"","actualites-formats":[26],"actualites-thematiques":[28],"class_list":["post-1682","actualites","type-actualites","status-publish","has-post-thumbnail","hentry"],"acf":[],"yoast_head":"<!-- This site is optimized with the Yoast SEO plugin v27.2 - https:\/\/yoast.com\/product\/yoast-seo-wordpress\/ -->\n<title>Julien RICHARD, \u00e9tudiant en mast\u00e8re DMS au Centre des Mat\u00e9riaux, a re\u00e7u le prix FERMI - Centre des Mat\u00e9riaux Mines Paris - PSL<\/title>\n<meta name=\"robots\" content=\"index, follow, max-snippet:-1, max-image-preview:large, max-video-preview:-1\" \/>\n<link rel=\"canonical\" href=\"https:\/\/www.minesparis.psl.eu\/cmat\/actualites\/julien-richard-etudiant-en-mastere-dms-au-centre-des-materiaux-a-recu-le-prix-fermi\/\" \/>\n<meta property=\"og:locale\" content=\"fr_FR\" \/>\n<meta property=\"og:type\" content=\"article\" \/>\n<meta property=\"og:title\" content=\"Julien RICHARD, \u00e9tudiant en mast\u00e8re DMS au Centre des Mat\u00e9riaux, a re\u00e7u le prix FERMI - 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