{"id":18887,"date":"2024-11-28T15:14:23","date_gmt":"2024-11-28T14:14:23","guid":{"rendered":"https:\/\/navier-lab.fr\/stage-internship-m2-investigation-of-micro-damage-in-salt-rock-samples-from-the-quantitative-analysis-of-x-ray-computed-tomography-3d-images\/"},"modified":"2024-11-28T15:17:24","modified_gmt":"2024-11-28T14:17:24","slug":"stage-internship-m2-investigation-of-micro-damage-in-salt-rock-samples-from-the-quantitative-analysis-of-x-ray-computed-tomography-3d-images","status":"publish","type":"post","link":"https:\/\/navier-lab.fr\/en\/stage-internship-m2-investigation-of-micro-damage-in-salt-rock-samples-from-the-quantitative-analysis-of-x-ray-computed-tomography-3d-images\/","title":{"rendered":"Stage\/Internship M2  : Investigation of micro-damage in salt-rock samples from the quantitative analysis of X-ray computed tomography 3D images"},"content":{"rendered":"<section class=\"kc-elm kc-css-72669 kc_row\"><div class=\"kc-row-container  kc-container\"><div class=\"kc-wrap-columns\"><div class=\"kc-elm kc-css-979402 kc_col-sm-12 kc_column kc_col-sm-12\"><div class=\"kc-col-container\"><div class=\"kc-elm kc_text_block\"><\/p>\n<style type=\"text\/css\"><\/style>\n<section class=\"kc-elm kc-css-503215 kc_row\">\n<div class=\"kc-row-container kc-container\">\n<div class=\"kc-wrap-columns\">\n<div class=\"kc-elm kc-css-3433579 kc_col-sm-12 kc_column kc_col-sm-12\">\n<div class=\"kc-col-container\">\n<div class=\"kc-elm kc-css-1767636\" style=\"height: 20px; clear: both; width: 100%;\"><\/div>\n<div class=\"kc-elm kc-css-1171742 divider_line\">\n<div class=\"divider_inner divider_line1\"><\/div>\n<\/div>\n<div class=\"kc-elm kc-css-4097290 kc_text_block\">\n<h3>Context<\/h3>\n<\/div>\n<div class=\"kc-elm kc-css-2555091 kc_text_block\">\n<p>Renewable hydrogen stands as a valuable alternative to fossil energy. The increase in hydrogen demand and production begs the question of its underground storage as a large-scale solution. In this context, large-scale engineered caverns in rock-salt geological formations seem to be a promising solution in terms of cost efficiency and safety in the long-term (Berest et al. 2019).<\/p>\n<p>It is, therefore, necessary to assess the rock-salt tightness to hydrogen by analysing the mechanical response of rock-salt samples subjected to stress conditions comparable to the field conditions. In this framework, the proposed internship aims better to comprehend micro-damage and fracture propagation in synthetic salt-rock samples. It will be part of the RockStorHy project funded by the ANR, which seeks to analyse the mechanical behaviour of the salt-rock in the short and long term. The project is based on complementary experimental and numerical multiscale approaches to investigate its viscoplastic flow.<\/p>\n<\/div>\n<div class=\"kc-elm kc-css-273103 divider_line\">\n<div class=\"divider_inner divider_line1\"><\/div>\n<\/div>\n<div class=\"kc-elm kc-css-482847 kc_text_block\">\n<h3>Objectives<\/h3>\n<\/div>\n<div class=\"kc-elm kc-css-1803372 kc_text_block\">\n<p>Triaxial tests combined with X-ray Computer Tomography (XRCT) imaging have been performed at the Psich\u00b4e beamline of Synchroton Soleil and in the lab tomograph of Laboratoire Navier. Wet and dry synthetic salt samples were prepared and tested by uniaxial and triaxial compression under different confining pressures and differential stresses representative of the conditions near caverns. Moreover, different loading velocities are experimented. The main purpose of the project is to improve the characterization of the fracture evolution within salt samples and relate it to the brine content and loading conditions by exploring qualitatively and quantitatively the 3D images obtained by XRCT. The main objectives are:<\/p>\n<ol>\n<li>Characterize the fracture pattern qualitatively.<\/li>\n<li>Perform a local analysis of fracture propagation, using in particular digital volume correlation (DVC) technique.<\/li>\n<li>Assess some quantitative evaluation of the salt mechanical behavior based on image analysis.<\/li>\n<\/ol>\n<p>Salt-rock images are poorly-contrasted and cannot be analyzed with standard image correlation techniques; advanced image processing tools are therefore needed. The intern is expected to employ these tools and integrate the results obtained based on previous studies carried out on the topic (Bourcier et al. 2012, Gaye 2015, Du et al. 2025). It is expected that the quantitative use of the grey levels of the XRCT images will provide evaluations of crack openings with sub-voxel accuracy, as in (Chen et al. 2020).<\/p>\n<p>Depending on the internship\u2019s progress, further experimental tests with different loading conditions might be performed on the lab tomograph for a more comprehensive analysis. In addition, tests on natural salt-rock samples are already planned and the intern might participate in them.<\/p>\n<\/div>\n<div class=\"kc-elm kc-css-1647693 divider_line\">\n<div class=\"divider_inner divider_line1\"><\/div>\n<\/div>\n<div class=\"kc-elm kc-css-1835187\"><a class=\"kc_button\" title=\"\" href=\"https:\/\/navier-lab.fr\/wp-content\/uploads\/2024\/11\/Internship_Navier_RockSalt_3Dimaging.pdf\" target=\"_blank\" rel=\"noopener\"><br \/>\nMore info <\/a><\/div>\n<\/div>\n<\/div>\n<\/div>\n<\/div>\n<\/section>\n<p>\n<\/div><\/div><\/div><\/div><\/div><\/section>\n","protected":false},"excerpt":{"rendered":"","protected":false},"author":10,"featured_media":0,"comment_status":"closed","ping_status":"open","sticky":false,"template":"","format":"standard","meta":{"_acf_changed":false,"footnotes":""},"categories":[266,242,267],"tags":[],"class_list":["post-18887","post","type-post","status-publish","format-standard","hentry","category-actualites-en","category-stages-en","category-stages-me-en"],"acf":[],"_links":{"self":[{"href":"https:\/\/navier-lab.fr\/en\/wp-json\/wp\/v2\/posts\/18887","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\/10"}],"replies":[{"embeddable":true,"href":"https:\/\/navier-lab.fr\/en\/wp-json\/wp\/v2\/comments?post=18887"}],"version-history":[{"count":1,"href":"https:\/\/navier-lab.fr\/en\/wp-json\/wp\/v2\/posts\/18887\/revisions"}],"predecessor-version":[{"id":18888,"href":"https:\/\/navier-lab.fr\/en\/wp-json\/wp\/v2\/posts\/18887\/revisions\/18888"}],"wp:attachment":[{"href":"https:\/\/navier-lab.fr\/en\/wp-json\/wp\/v2\/media?parent=18887"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"https:\/\/navier-lab.fr\/en\/wp-json\/wp\/v2\/categories?post=18887"},{"taxonomy":"post_tag","embeddable":true,"href":"https:\/\/navier-lab.fr\/en\/wp-json\/wp\/v2\/tags?post=18887"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}