{"id":8946,"date":"2025-10-01T11:44:00","date_gmt":"2025-10-01T10:44:00","guid":{"rendered":"https:\/\/l2ep.univ-lille.fr\/?p=8946"},"modified":"2025-11-27T11:47:33","modified_gmt":"2025-11-27T10:47:33","slug":"soutenance-de-these-2","status":"publish","type":"post","link":"https:\/\/l2ep.univ-lille.fr\/en\/soutenance-de-these-2\/","title":{"rendered":"Soutenance de th\u00e8se, Fabien DANCOISNE, 1er D\u00e9c. 2025"},"content":{"rendered":"<div style=\"width: 700px; margin: auto;\">\n<p style=\"text-align: center;\"><strong><span style=\"font-size: medium; color: #f07e1c;\">Caract\u00e9risation et mod\u00e9lisation du vieillissement magn\u00e9tique d\u2019aciers ferromagn\u00e9tiques doux pour la r\u00e9duction des pertes fer<\/span><\/strong><\/p>\n<p style=\"text-align: center;\">lundi 1er d\u00e9cembre 2025 \u00e0 14 h<\/p>\n<p style=\"text-align: center;\">Lieu : \u00c9cole Nationale Sup\u00e9rieure d\u2019Arts et M\u00e9tiers, 8 boulevard Louis XIV, 59000 Lille<br \/>\nSalle La Rochefoucauld<\/p>\n<p><strong><span style=\"color: #f07e1c;\">Mots-clefs<\/span><\/strong><\/p>\n<p>Vieillissement magn\u00e9tique, Mat\u00e9riaux Ferromagn\u00e9tiques, Pertes fer, Champ coercitif, Hyst\u00e9r\u00e9sis magn\u00e9tique, Pr\u00e9cipitation<\/p>\n<p><strong><span style=\"color: #f07e1c;\">R\u00e9sum\u00e9<\/span><\/strong><\/p>\n<p>Afin d\u2019am\u00e9liorer l\u2019efficacit\u00e9 \u00e9nerg\u00e9tique et de r\u00e9duire les pertes des aciers des machines \u00e9lectriques tournantes, il est n\u00e9cessaire de surveiller, mod\u00e9liser et pr\u00e9dire l\u2019\u00e9volution de leurs propri\u00e9t\u00e9s au fil du temps. Les propri\u00e9t\u00e9s d\u2019usage des t\u00f4les d\u2019acier non-orient\u00e9es Fe-Si couramment utilis\u00e9es sont \u00e9tudi\u00e9es. Aux temp\u00e9ratures de fonctionnement atteignant 200 \u00b0C, une d\u00e9gradation irr\u00e9versible des propri\u00e9t\u00e9s magn\u00e9tiques se produit, augmentant les pertes : le vieillissement magn\u00e9tique. R\u00e9sultant de la pr\u00e9cipitation du carbone dans les mat\u00e9riaux utilis\u00e9s, ce ph\u00e9nom\u00e8ne est bien caract\u00e9ris\u00e9 dans la litt\u00e9rature. Pour en tenir compte lors de la conception des machines, une nouvelle approche de mod\u00e9lisation est recherch\u00e9e. Ces travaux visent \u00e0 d\u00e9velopper un mod\u00e8le multi-\u00e9chelles et multi-physiques bas\u00e9 sur des caract\u00e9risations exp\u00e9rimentales reliant la cin\u00e9tique microscopique de la pr\u00e9cipitation aux comportements magn\u00e9tiques macroscopiques pour \u00e9tudier leur impact sur les pertes fer.<\/p>\n<p>To improve energy efficiency and to reduce losses of steel used in electrical machines, it is necessary to accurately monitor, model and predict the evolution of their properties over time. Here, the usage properties of commonly Fe-Si Non-Oriented Steel Sheets are studied. At operating temperatures reaching 200\u00b0C, an irreversible degradation of magnetic properties occurs that increases the losses of these steels: the so-called magnetic aging. Stemming from carbon precipitation in the used materials, this phenomenon is well characterized in literature. However, to take it into account during the design process of machines, a new modeling approach is sought. This PhD thesis aims to develop a multi-scale, multi-physical model based on experimental characterizations that links microscopic precipitation kinetics to a macroscopic magnetic behavior model, this way investigating the aging mechanisms in electrical steels and their consequences on iron losses.<\/p>\n<\/div>\n","protected":false},"excerpt":{"rendered":"<p>Caract\u00e9risation et mod\u00e9lisation du vieillissement magn\u00e9tique d\u2019aciers ferromagn\u00e9tiques doux pour la r\u00e9duction des pertes fer lundi 1er d\u00e9cembre 2025 \u00e0 14 h Lieu : \u00c9cole Nationale Sup\u00e9rieure d\u2019Arts et M\u00e9tiers, 8 boulevard Louis XIV, 59000 Lille Salle La Rochefoucauld Mots-clefs Vieillissement magn\u00e9tique, Mat\u00e9riaux Ferromagn\u00e9tiques, Pertes fer, Champ coercitif, Hyst\u00e9r\u00e9sis magn\u00e9tique, Pr\u00e9cipitation R\u00e9sum\u00e9 Afin d\u2019am\u00e9liorer l\u2019efficacit\u00e9 [&hellip;]<\/p>\n","protected":false},"author":8,"featured_media":0,"comment_status":"closed","ping_status":"closed","sticky":false,"template":"","format":"standard","meta":[],"categories":[1,34,3],"tags":[],"_links":{"self":[{"href":"https:\/\/l2ep.univ-lille.fr\/en\/wp-json\/wp\/v2\/posts\/8946"}],"collection":[{"href":"https:\/\/l2ep.univ-lille.fr\/en\/wp-json\/wp\/v2\/posts"}],"about":[{"href":"https:\/\/l2ep.univ-lille.fr\/en\/wp-json\/wp\/v2\/types\/post"}],"author":[{"embeddable":true,"href":"https:\/\/l2ep.univ-lille.fr\/en\/wp-json\/wp\/v2\/users\/8"}],"replies":[{"embeddable":true,"href":"https:\/\/l2ep.univ-lille.fr\/en\/wp-json\/wp\/v2\/comments?post=8946"}],"version-history":[{"count":2,"href":"https:\/\/l2ep.univ-lille.fr\/en\/wp-json\/wp\/v2\/posts\/8946\/revisions"}],"predecessor-version":[{"id":8949,"href":"https:\/\/l2ep.univ-lille.fr\/en\/wp-json\/wp\/v2\/posts\/8946\/revisions\/8949"}],"wp:attachment":[{"href":"https:\/\/l2ep.univ-lille.fr\/en\/wp-json\/wp\/v2\/media?parent=8946"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"https:\/\/l2ep.univ-lille.fr\/en\/wp-json\/wp\/v2\/categories?post=8946"},{"taxonomy":"post_tag","embeddable":true,"href":"https:\/\/l2ep.univ-lille.fr\/en\/wp-json\/wp\/v2\/tags?post=8946"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}