{"id":19966,"date":"2025-11-06T19:13:35","date_gmt":"2025-11-06T18:13:35","guid":{"rendered":"https:\/\/navier-lab.fr\/?p=19966"},"modified":"2025-11-07T10:13:10","modified_gmt":"2025-11-07T09:13:10","slug":"soutenance-de-these-ibrahim-awada","status":"publish","type":"post","link":"https:\/\/navier-lab.fr\/en\/soutenance-de-these-ibrahim-awada\/","title":{"rendered":"PhD defense \u2013 Ibrahim Awada"},"content":{"rendered":"<section class=\"kc-elm kc-css-748845 kc_row\"><div class=\"kc-row-container  kc-container\"><div class=\"kc-wrap-columns\"><div class=\"kc-elm kc-css-512805 kc_col-sm-12 kc_column kc_col-sm-12\"><div class=\"kc-col-container\"><div class=\"kc-elm kc-css-611897 kc_text_block\"><\/p>\n<p style=\"text-align: justify;\">Ibrahim Awada, a PhD candidate in the RMP team, will defend his dissertation titled <em>&#8220;Local plastic strain in granular media: compaction and avalanche precursors\"<\/em> on Friday, November 14, at 2:00 PM, in room V404 (Carnot building).<\/p>\n<p class=\"x_MsoNoSpacing\"><strong>Composition of the jury :<\/strong><\/p>\n<div>\n<ul type=\"disc\">\n<li data-olk-copy-source=\"MessageBody\">Michel Bornert, ENPC \u2013 Co-supervisor<\/li>\n<li>Luca Cipelletti, Universit\u00e9 de Montpellier \u2013 Reviewer<\/li>\n<li>Djimedo Kondo, Sorbonne Universit\u00e9 \u2013 Examiner<\/li>\n<li>Vincent Langlois, Universit\u00e9 Gustave Eiffel \u2013 Co-supervisor<\/li>\n<li>Julien L\u00e9opold\u00e8s, Universit\u00e9 Gustave Eiffel \u2013 Supervisor<\/li>\n<li>Vincent Richefeu, Universit\u00e9 Grenoble Alpes \u2013 Reviewer<\/li>\n<li>Anne Tanguy, INSA Lyon \u2013 Examiner<\/li>\n<\/ul>\n<\/div>\n<p><span lang=\"pt-BR\">The defense will be broadcasted live on Microsoft Teams. You can follow it here: <\/span><\/p>\n<p><a href=\"https:\/\/univ-eiffel.zoom.us\/j\/88909253454\">https:\/\/univ-eiffel.zoom.us\/j\/88909253454<\/a><\/p>\n<p>Meeting ID: 889 0925 3454<br \/>Password: DjZuWDU5<\/p>\n<p>\n<\/div><div data-closeall=\"true\" class=\"kc-elm kc-css-582593 kc_accordion_wrapper\">\n    <h3 class=\"kc-accordion-title\">Abstract<\/h3>\n<div class=\"kc-elm kc-css-766038 kc_accordion_section group \"><h3 class=\"kc_accordion_header ui-accordion-header\"><span class=\"ui-accordion-header-icon ui-icon\"><\/span><a href=\"#show-the-abstract\" data-prevent=\"scroll\"><i class=\"\"><\/i> Show the abstract<\/a><\/h3><div class=\"kc_accordion_content ui-accordion-content kc_clearfix\"><div class=\"kc-panel-body\"><div class=\"kc-elm kc-css-761333 kc_text_block\"><\/p>\n<p style=\"text-align: justify;\">In general, the macroscopic plastic deformation \u2014 the irreversible part of a material\u2019s total strain \u2014 results from rearrangements within its microstructure. In granular materials, the nature of these rearrangements remains difficult to define. To better understand the underlying processes, we developed an experimental method to track the microscopic deformation of a granular packing during loading (in an inclined or vibrated configuration). This approach combines two complementary measurements: correlation of multiply scattered ultrasonic signals (Diffusive Acoustic Wave Spectroscopy, DAWS) and optical tracking of grain displacements. Our observations during loading\u2013 unloading cycles reveal the presence of a memory effect (distinct from elasticity) and a second effect related to the degree of reversibility of strain fluctuations. The combination of these two effects gives rise to a robust relationship between the mean plastic strain and its local fluctuations, which is independent of both the frequency and the type of mechanical loading. Finally, when the granular medium is inclined up to avalanche onset, we show that the number and intensity of precursory failure events are strongly influenced by the geometry of the packing and its compatibility with the applied load. Our results make it possible to assess the active or passive role of the precursor regarding to the avalanche.<\/p>\n<p>\n<\/div><\/div><\/div><\/div><\/div>\n<\/div><\/div><\/div><\/div><\/section>\n","protected":false},"excerpt":{"rendered":"","protected":false},"author":145,"featured_media":20003,"comment_status":"closed","ping_status":"open","sticky":false,"template":"","format":"standard","meta":{"_acf_changed":false,"footnotes":""},"categories":[266,251,290,299],"tags":[],"class_list":["post-19966","post","type-post","status-publish","format-standard","has-post-thumbnail","hentry","category-actualites-en","category-annonces-en","category-annonces-rmp-en","category-soutenances-de-these-en"],"acf":[],"_links":{"self":[{"href":"https:\/\/navier-lab.fr\/en\/wp-json\/wp\/v2\/posts\/19966","targetHints":{"allow":["GET"]}}],"collection":[{"href":"https:\/\/navier-lab.fr\/en\/wp-json\/wp\/v2\/posts"}],"about":[{"href":"https:\/\/navier-lab.fr\/en\/wp-json\/wp\/v2\/types\/post"}],"author":[{"embeddable":true,"href":"https:\/\/navier-lab.fr\/en\/wp-json\/wp\/v2\/users\/145"}],"replies":[{"embeddable":true,"href":"https:\/\/navier-lab.fr\/en\/wp-json\/wp\/v2\/comments?post=19966"}],"version-history":[{"count":8,"href":"https:\/\/navier-lab.fr\/en\/wp-json\/wp\/v2\/posts\/19966\/revisions"}],"predecessor-version":[{"id":20014,"href":"https:\/\/navier-lab.fr\/en\/wp-json\/wp\/v2\/posts\/19966\/revisions\/20014"}],"wp:featuredmedia":[{"embeddable":true,"href":"https:\/\/navier-lab.fr\/en\/wp-json\/wp\/v2\/media\/20003"}],"wp:attachment":[{"href":"https:\/\/navier-lab.fr\/en\/wp-json\/wp\/v2\/media?parent=19966"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"https:\/\/navier-lab.fr\/en\/wp-json\/wp\/v2\/categories?post=19966"},{"taxonomy":"post_tag","embeddable":true,"href":"https:\/\/navier-lab.fr\/en\/wp-json\/wp\/v2\/tags?post=19966"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}