{"id":9287,"date":"2026-09-30T07:40:22","date_gmt":"2026-09-30T06:40:22","guid":{"rendered":"https:\/\/l2ep.univ-lille.fr\/?p=9287"},"modified":"2026-10-01T07:45:14","modified_gmt":"2026-10-01T06:45:14","slug":"soutenance-de-these-badr-cherqaoui-30-nov-2026","status":"publish","type":"post","link":"https:\/\/l2ep.univ-lille.fr\/en\/soutenance-de-these-badr-cherqaoui-30-nov-2026\/","title":{"rendered":"Soutenance de Th\u00e8se, Badr CHERQAOUI, 30 Nov. 2026"},"content":{"rendered":"

<\/span><\/strong><\/p>\n

\n

D\u00e9veloppement de m\u00e9thodes adapt\u00e9es \u00e0 la mod\u00e9lisation de d\u00e9fauts complexes en \u00e9valuation non destructive par courants de Foucault<\/span><\/strong><\/p>\n

lundi 30 novembre 2026, matin
\nArts et M\u00e9tiers Lille, salle La Rochefoucauld<\/p>\n

R\u00e9sum\u00e9<\/span><\/strong><\/p>\n

En contr\u00f4le non destructif par courants de Foucault, l\u2019interpr\u00e9tation des signaux devient complexe lorsque les fissures pr\u00e9sentent des morphologies irr\u00e9guli\u00e8res et ramifi\u00e9es. Cette th\u00e8se vise \u00e0 d\u00e9velopper des m\u00e9thodes de mod\u00e9lisation adapt\u00e9es \u00e0 ces d\u00e9fauts r\u00e9alistes.
\nUne cha\u00eene de calcul par \u00e9l\u00e9ments finis est tout d\u2019abord mise en place afin de repr\u00e9senter leur g\u00e9om\u00e9trie complexe et leur tr\u00e8s faible ouverture au moyen d\u2019\u00e9l\u00e9ments coques. Les simulations obtenues pr\u00e9sentent un bon accord avec des mesures exp\u00e9rimentales. Une repr\u00e9sentation param\u00e9trique r\u00e9duite des d\u00e9fauts est ensuite propos\u00e9e afin d\u2019\u00e9tudier les relations entre leur g\u00e9om\u00e9trie et plusieurs indicateurs du signal. Des m\u00e9tamod\u00e8les par processus gaussiens et une analyse de sensibilit\u00e9 permettent d\u2019identifier les param\u00e8tres g\u00e9om\u00e9triques les plus influents.
\nEnfin, une inversion bay\u00e9sienne est d\u00e9velopp\u00e9e afin de caract\u00e9riser les configurations compatibles avec les observations et de quantifier les incertitudes associ\u00e9es. Les r\u00e9sultats montrent que la profondeur maximale et l\u2019ouverture angulaire constituent les caract\u00e9ristiques g\u00e9om\u00e9triques les mieux identifiables.<\/p>\n

Mots cl\u00e9s<\/span><\/strong><\/p>\n

Contr\u00f4le non destructif ; Courants de Foucault ; Corrosion sous contrainte ; \u00c9l\u00e9ments finis ; Processus gaussiens ; Analyse de sensibilit\u00e9 ; Inversion bay\u00e9sienne.<\/p>\n

Abstract<\/span><\/strong><\/p>\n

In eddy-current non-destructive testing, signal interpretation becomes complex when cracks exhibit irregular and branched morphologies. This thesis aims to develop modelling methods adapted to such realistic defects. A finite-element framework is first developed to represent their complex geometry and very small opening using shell elements. The numerical results show good agreement with experimental measurements. A reduced parametric representation of the defects is then introduced to investigate the relationships between their geometry and several signal indicators. Gaussian-process surrogate models and a global sensitivity analysis are used to identify the most influential geometrical parameters.
\nFinally, a Bayesian inversion method is developed to characterize the configurations compatible with the observations and to quantify the associated uncertainties. The results show that maximum crack depth and angular extent are the most identifiable geometrical characteristics.<\/p>\n

Keywords<\/span><\/strong><\/p>\n

Non-destructive testing ; Eddy currents ; Stress corrosion cracking ; Finite
\nelements ; Gaussian processes ; Global sensitivity analysis ; Bayesian inversion<\/p>\n<\/div>\n","protected":false},"excerpt":{"rendered":"

D\u00e9veloppement de m\u00e9thodes adapt\u00e9es \u00e0 la mod\u00e9lisation de d\u00e9fauts complexes en \u00e9valuation non destructive par courants de Foucault lundi 30 novembre 2026, matin Arts et M\u00e9tiers Lille, salle La Rochefoucauld R\u00e9sum\u00e9 En contr\u00f4le non destructif par courants de Foucault, l\u2019interpr\u00e9tation des signaux devient complexe lorsque les fissures pr\u00e9sentent des morphologies irr\u00e9guli\u00e8res et ramifi\u00e9es. Cette th\u00e8se […]<\/p>\n","protected":false},"author":8,"featured_media":0,"comment_status":"closed","ping_status":"closed","sticky":false,"template":"","format":"standard","meta":{"footnotes":""},"categories":[34,3],"tags":[],"class_list":["post-9287","post","type-post","status-publish","format-standard","hentry","category-omn","category-southese"],"_links":{"self":[{"href":"https:\/\/l2ep.univ-lille.fr\/en\/wp-json\/wp\/v2\/posts\/9287","targetHints":{"allow":["GET"]}}],"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=9287"}],"version-history":[{"count":2,"href":"https:\/\/l2ep.univ-lille.fr\/en\/wp-json\/wp\/v2\/posts\/9287\/revisions"}],"predecessor-version":[{"id":9289,"href":"https:\/\/l2ep.univ-lille.fr\/en\/wp-json\/wp\/v2\/posts\/9287\/revisions\/9289"}],"wp:attachment":[{"href":"https:\/\/l2ep.univ-lille.fr\/en\/wp-json\/wp\/v2\/media?parent=9287"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"https:\/\/l2ep.univ-lille.fr\/en\/wp-json\/wp\/v2\/categories?post=9287"},{"taxonomy":"post_tag","embeddable":true,"href":"https:\/\/l2ep.univ-lille.fr\/en\/wp-json\/wp\/v2\/tags?post=9287"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}