{"id":5054,"date":"2026-01-31T08:14:00","date_gmt":"2026-01-31T00:14:00","guid":{"rendered":"https:\/\/www.topfastpcb.com\/?p=5054"},"modified":"2026-01-21T15:56:43","modified_gmt":"2026-01-21T07:56:43","slug":"cracked-vias-and-barrel-cracks-in-pcb","status":"publish","type":"post","link":"https:\/\/www.topfastpcb.com\/fr\/blog\/cracked-vias-and-barrel-cracks-in-pcb\/","title":{"rendered":"Vias fissur\u00e9s et fissures de tonneau dans le circuit imprim\u00e9"},"content":{"rendered":"<p>Les vias fissur\u00e9s et les fissures en tonneau sont parmi les plus critiques. <strong>les d\u00e9faillances latentes en mati\u00e8re de fiabilit\u00e9<\/strong> dans la fabrication des circuits imprim\u00e9s.<\/p><p>Ces d\u00e9fauts passent souvent avec succ\u00e8s les tests \u00e9lectriques initiaux, mais tombent en panne plus tard sous l'effet de contraintes thermiques ou m\u00e9caniques, ce qui les rend particuli\u00e8rement dangereux dans les applications \u00e0 haute fiabilit\u00e9.<\/p><p>Cet article explique :<\/p><ul class=\"wp-block-list\"><li>Qu'est-ce qu'une fissure via et une fissure en tonneau ?<\/li>\n\n<li>Pourquoi ils se produisent<\/li>\n\n<li>Comment ils sont d\u00e9tect\u00e9s<\/li>\n\n<li>Comment les fabricants r\u00e9duisent leur fr\u00e9quence<\/li><\/ul><div class=\"wp-block-image\"><figure class=\"aligncenter size-full\"><img loading=\"lazy\" decoding=\"async\" width=\"600\" height=\"337\" src=\"https:\/\/www.topfastpcb.com\/wp-content\/uploads\/2026\/01\/PCB-Failures.jpg\" alt=\"D\u00e9faillances des circuits imprim\u00e9s\" class=\"wp-image-5055\" srcset=\"https:\/\/www.topfastpcb.com\/wp-content\/uploads\/2026\/01\/PCB-Failures.jpg 600w, https:\/\/www.topfastpcb.com\/wp-content\/uploads\/2026\/01\/PCB-Failures-300x169.jpg 300w, https:\/\/www.topfastpcb.com\/wp-content\/uploads\/2026\/01\/PCB-Failures-18x10.jpg 18w\" sizes=\"auto, (max-width: 600px) 100vw, 600px\" \/><\/figure><\/div><div id=\"ez-toc-container\" class=\"ez-toc-v2_0_74 counter-hierarchy ez-toc-counter ez-toc-custom ez-toc-container-direction\">\n<div class=\"ez-toc-title-container\">\n<p class=\"ez-toc-title\" style=\"cursor:inherit\">Table des mati\u00e8res<\/p>\n<span class=\"ez-toc-title-toggle\"><\/span><\/div>\n<nav><ul class='ez-toc-list ez-toc-list-level-1' ><li class='ez-toc-page-1 ez-toc-heading-level-2'><a class=\"ez-toc-link ez-toc-heading-1\" href=\"https:\/\/www.topfastpcb.com\/fr\/blog\/cracked-vias-and-barrel-cracks-in-pcb\/#What_Are_Via_Cracks_and_Barrel_Cracks\" >Que sont les Via Cracks et les Barrel Cracks ?<\/a><ul class='ez-toc-list-level-3' ><li class='ez-toc-heading-level-3'><a class=\"ez-toc-link ez-toc-heading-2\" href=\"https:\/\/www.topfastpcb.com\/fr\/blog\/cracked-vias-and-barrel-cracks-in-pcb\/#Via_Crack\" >Via Crack<\/a><\/li><li class='ez-toc-page-1 ez-toc-heading-level-3'><a class=\"ez-toc-link ez-toc-heading-3\" href=\"https:\/\/www.topfastpcb.com\/fr\/blog\/cracked-vias-and-barrel-cracks-in-pcb\/#Barrel_Crack\" >Fissure du tonneau<\/a><\/li><\/ul><\/li><li class='ez-toc-page-1 ez-toc-heading-level-2'><a class=\"ez-toc-link ez-toc-heading-4\" href=\"https:\/\/www.topfastpcb.com\/fr\/blog\/cracked-vias-and-barrel-cracks-in-pcb\/#Why_Via_Cracks_Are_a_Serious_Reliability_Issue\" >Pourquoi les fissures Via constituent-elles un grave probl\u00e8me de fiabilit\u00e9 ?<\/a><\/li><li class='ez-toc-page-1 ez-toc-heading-level-2'><a class=\"ez-toc-link ez-toc-heading-5\" href=\"https:\/\/www.topfastpcb.com\/fr\/blog\/cracked-vias-and-barrel-cracks-in-pcb\/#Primary_Causes_of_Via_and_Barrel_Cracks\" >Principales causes des fissures de l'auge et du f\u00fbt<\/a><ul class='ez-toc-list-level-3' ><li class='ez-toc-heading-level-3'><a class=\"ez-toc-link ez-toc-heading-6\" href=\"https:\/\/www.topfastpcb.com\/fr\/blog\/cracked-vias-and-barrel-cracks-in-pcb\/#Z-Axis_Expansion_Mismatch\" >Inad\u00e9quation de l'expansion de l'axe Z<\/a><\/li><li class='ez-toc-page-1 ez-toc-heading-level-3'><a class=\"ez-toc-link ez-toc-heading-7\" href=\"https:\/\/www.topfastpcb.com\/fr\/blog\/cracked-vias-and-barrel-cracks-in-pcb\/#Thin_or_Non-Uniform_Copper_Plating\" >Placage de cuivre mince ou non uniforme<\/a><\/li><li class='ez-toc-page-1 ez-toc-heading-level-3'><a class=\"ez-toc-link ez-toc-heading-8\" href=\"https:\/\/www.topfastpcb.com\/fr\/blog\/cracked-vias-and-barrel-cracks-in-pcb\/#High_Aspect_Ratio_Vias\" >Vias \u00e0 haut rapport d'aspect<\/a><\/li><li class='ez-toc-page-1 ez-toc-heading-level-3'><a class=\"ez-toc-link ez-toc-heading-9\" href=\"https:\/\/www.topfastpcb.com\/fr\/blog\/cracked-vias-and-barrel-cracks-in-pcb\/#Excessive_Thermal_Cycling\" >Cyclage thermique excessif<\/a><\/li><\/ul><\/li><li class='ez-toc-page-1 ez-toc-heading-level-2'><a class=\"ez-toc-link ez-toc-heading-10\" href=\"https:\/\/www.topfastpcb.com\/fr\/blog\/cracked-vias-and-barrel-cracks-in-pcb\/#Design_Factors_That_Increase_Via_Crack_Risk\" >Facteurs de conception qui augmentent le risque de fissures Via<\/a><ul class='ez-toc-list-level-3' ><li class='ez-toc-heading-level-3'><a class=\"ez-toc-link ez-toc-heading-11\" href=\"https:\/\/www.topfastpcb.com\/fr\/blog\/cracked-vias-and-barrel-cracks-in-pcb\/#High-Risk_Design_Choices\" >Choix de conception \u00e0 haut risque<\/a><\/li><\/ul><\/li><li class='ez-toc-page-1 ez-toc-heading-level-2'><a class=\"ez-toc-link ez-toc-heading-12\" href=\"https:\/\/www.topfastpcb.com\/fr\/blog\/cracked-vias-and-barrel-cracks-in-pcb\/#Manufacturing_Factors_Contributing_to_Via_Cracks\" >Facteurs de fabrication contribuant aux fissures Via<\/a><ul class='ez-toc-list-level-3' ><li class='ez-toc-heading-level-3'><a class=\"ez-toc-link ez-toc-heading-13\" href=\"https:\/\/www.topfastpcb.com\/fr\/blog\/cracked-vias-and-barrel-cracks-in-pcb\/#Drilling_Quality\" >Qualit\u00e9 du forage<\/a><\/li><li class='ez-toc-page-1 ez-toc-heading-level-3'><a class=\"ez-toc-link ez-toc-heading-14\" href=\"https:\/\/www.topfastpcb.com\/fr\/blog\/cracked-vias-and-barrel-cracks-in-pcb\/#Inadequate_Desmear_Process\" >Processus de d\u00e9maculage inad\u00e9quat<\/a><\/li><li class='ez-toc-page-1 ez-toc-heading-level-3'><a class=\"ez-toc-link ez-toc-heading-15\" href=\"https:\/\/www.topfastpcb.com\/fr\/blog\/cracked-vias-and-barrel-cracks-in-pcb\/#Plating_Stress_Control\" >Contr\u00f4le des contraintes de placage<\/a><\/li><\/ul><\/li><li class='ez-toc-page-1 ez-toc-heading-level-2'><a class=\"ez-toc-link ez-toc-heading-16\" href=\"https:\/\/www.topfastpcb.com\/fr\/blog\/cracked-vias-and-barrel-cracks-in-pcb\/#How_Via_Cracks_Are_Detected\" >Comment les fissures de Via sont-elles d\u00e9tect\u00e9es ?<\/a><ul class='ez-toc-list-level-3' ><li class='ez-toc-heading-level-3'><a class=\"ez-toc-link ez-toc-heading-17\" href=\"https:\/\/www.topfastpcb.com\/fr\/blog\/cracked-vias-and-barrel-cracks-in-pcb\/#Common_Detection_Methods\" >M\u00e9thodes de d\u00e9tection courantes<\/a><\/li><\/ul><\/li><li class='ez-toc-page-1 ez-toc-heading-level-2'><a class=\"ez-toc-link ez-toc-heading-18\" href=\"https:\/\/www.topfastpcb.com\/fr\/blog\/cracked-vias-and-barrel-cracks-in-pcb\/#Preventing_Cracked_Vias_and_Barrel_Cracks\" >Pr\u00e9vention des fissures dans les tuyaux et des fissures dans les tonneaux<\/a><ul class='ez-toc-list-level-3' ><li class='ez-toc-heading-level-3'><a class=\"ez-toc-link ez-toc-heading-19\" href=\"https:\/\/www.topfastpcb.com\/fr\/blog\/cracked-vias-and-barrel-cracks-in-pcb\/#Design-Level_Prevention\" >Pr\u00e9vention au niveau de la conception<\/a><\/li><li class='ez-toc-page-1 ez-toc-heading-level-3'><a class=\"ez-toc-link ez-toc-heading-20\" href=\"https:\/\/www.topfastpcb.com\/fr\/blog\/cracked-vias-and-barrel-cracks-in-pcb\/#Process-Level_Prevention\" >Pr\u00e9vention au niveau du processus<\/a><\/li><li class='ez-toc-page-1 ez-toc-heading-level-3'><a class=\"ez-toc-link ez-toc-heading-21\" href=\"https:\/\/www.topfastpcb.com\/fr\/blog\/cracked-vias-and-barrel-cracks-in-pcb\/#Material_Selection\" >S\u00e9lection des mat\u00e9riaux<\/a><\/li><\/ul><\/li><li class='ez-toc-page-1 ez-toc-heading-level-2'><a class=\"ez-toc-link ez-toc-heading-22\" href=\"https:\/\/www.topfastpcb.com\/fr\/blog\/cracked-vias-and-barrel-cracks-in-pcb\/#Relationship_to_Other_PCB_Failure_Modes\" >Relation avec d'autres modes de d\u00e9faillance des circuits imprim\u00e9s<\/a><\/li><li class='ez-toc-page-1 ez-toc-heading-level-2'><a class=\"ez-toc-link ez-toc-heading-23\" href=\"https:\/\/www.topfastpcb.com\/fr\/blog\/cracked-vias-and-barrel-cracks-in-pcb\/#Conclusion\" >Conclusion<\/a><\/li><li class='ez-toc-page-1 ez-toc-heading-level-2'><a class=\"ez-toc-link ez-toc-heading-24\" href=\"https:\/\/www.topfastpcb.com\/fr\/blog\/cracked-vias-and-barrel-cracks-in-pcb\/#Via_Cracks_in_PCB_FAQ\" >Via Cracks in PCB FAQ<\/a><\/li><\/ul><\/nav><\/div>\n<h2 class=\"wp-block-heading\"><span class=\"ez-toc-section\" id=\"What_Are_Via_Cracks_and_Barrel_Cracks\"><\/span>Que sont les Via Cracks et les Barrel Cracks ?<span class=\"ez-toc-section-end\"><\/span><\/h2><h3 class=\"wp-block-heading\"><span class=\"ez-toc-section\" id=\"Via_Crack\"><\/span>Via Crack<span class=\"ez-toc-section-end\"><\/span><\/h3><p>Une fissure de via est une fracture dans le placage de cuivre d'un via, g\u00e9n\u00e9ralement au niveau.. :<\/p><ul class=\"wp-block-list\"><li>Le genou du via<\/li>\n\n<li>L'interface entre le cuivre et le di\u00e9lectrique<\/li><\/ul><h3 class=\"wp-block-heading\"><span class=\"ez-toc-section\" id=\"Barrel_Crack\"><\/span>Fissure du tonneau<span class=\"ez-toc-section-end\"><\/span><\/h3><p>Une fissure de baril se r\u00e9f\u00e8re sp\u00e9cifiquement \u00e0 une <strong>fissure circonf\u00e9rentielle<\/strong> dans l'orifice d'entr\u00e9e plaqu\u00e9.<\/p><p>Tous deux interrompent la continuit\u00e9 \u00e9lectrique au fil du temps.<\/p><h2 class=\"wp-block-heading\"><span class=\"ez-toc-section\" id=\"Why_Via_Cracks_Are_a_Serious_Reliability_Issue\"><\/span>Pourquoi les fissures Via constituent-elles un grave probl\u00e8me de fiabilit\u00e9 ?<span class=\"ez-toc-section-end\"><\/span><\/h2><p>Les fissures Via sont dangereuses parce qu'elles :<\/p><ul class=\"wp-block-list\"><li>sont souvent intermittents<\/li>\n\n<li>S'aggrave avec le cycle thermique<\/li>\n\n<li>sont difficiles \u00e0 d\u00e9tecter visuellement<\/li><\/ul><p>Ils n'apparaissent souvent qu'apr\u00e8s une utilisation sur le terrain ou un test de r\u00e9sistance.<\/p><p><em>Vue d'ensemble des d\u00e9faillances :<\/em><br><strong><a href=\"https:\/\/www.topfastpcb.com\/fr\/blog\/common-pcb-failures-causes-solutions\/\">Explication des d\u00e9faillances courantes des circuits imprim\u00e9s<\/a><\/strong><\/p><h2 class=\"wp-block-heading\"><span class=\"ez-toc-section\" id=\"Primary_Causes_of_Via_and_Barrel_Cracks\"><\/span>Principales causes des fissures de l'auge et du f\u00fbt<span class=\"ez-toc-section-end\"><\/span><\/h2><h3 class=\"wp-block-heading\"><span class=\"ez-toc-section\" id=\"Z-Axis_Expansion_Mismatch\"><\/span>Inad\u00e9quation de l'expansion de l'axe Z<span class=\"ez-toc-section-end\"><\/span><\/h3><p>Pendant le chauffage, les mat\u00e9riaux di\u00e9lectriques se dilatent davantage que le cuivre dans l'axe Z.<\/p><p>L'expansion et la contraction r\u00e9p\u00e9t\u00e9es cr\u00e9ent des tensions dans le canon de l'via.<\/p><h3 class=\"wp-block-heading\"><span class=\"ez-toc-section\" id=\"Thin_or_Non-Uniform_Copper_Plating\"><\/span>Placage de cuivre mince ou non uniforme<span class=\"ez-toc-section-end\"><\/span><\/h3><p>Une \u00e9paisseur de placage insuffisante r\u00e9duit la capacit\u00e9 du via \u00e0 absorber les contraintes m\u00e9caniques.<\/p><p> <em>D\u00e9tail du processus :<\/em><br><strong><a href=\"https:\/\/www.topfastpcb.com\/fr\/blog\/copper-plating-process-in-pcb-manufacturing-explained\/\">Processus de placage du cuivre dans la fabrication des circuits imprim\u00e9s<\/a><\/strong><\/p><h3 class=\"wp-block-heading\"><span class=\"ez-toc-section\" id=\"High_Aspect_Ratio_Vias\"><\/span>Vias \u00e0 haut rapport d'aspect<span class=\"ez-toc-section-end\"><\/span><\/h3><p>Les vias \u00e0 rapport d'aspect \u00e9lev\u00e9 sont plus difficiles \u00e0 plaquer uniform\u00e9ment et subissent des contraintes plus importantes.<\/p><h3 class=\"wp-block-heading\"><span class=\"ez-toc-section\" id=\"Excessive_Thermal_Cycling\"><\/span>Cyclage thermique excessif<span class=\"ez-toc-section-end\"><\/span><\/h3><p>Exposition r\u00e9p\u00e9t\u00e9e \u00e0 :<\/p><ul class=\"wp-block-list\"><li>Soudure par refusion<\/li>\n\n<li>Cyclisme de puissance<\/li>\n\n<li>Changements de temp\u00e9rature de l'environnement<\/li><\/ul><p>Acc\u00e9l\u00e8re la formation de fissures.<\/p><p><em>Test de fiabilit\u00e9 :<\/em><br><strong><a href=\"https:\/\/www.topfastpcb.com\/fr\/blog\/pcb-reliability-testing-standards\/\">Test de fiabilit\u00e9 thermique des circuits imprim\u00e9s<\/a><\/strong><\/p><div class=\"wp-block-image\"><figure class=\"aligncenter size-full\"><img loading=\"lazy\" decoding=\"async\" width=\"600\" height=\"337\" src=\"https:\/\/www.topfastpcb.com\/wp-content\/uploads\/2026\/01\/PCB-Failures-1.jpg\" alt=\"D\u00e9faillances des circuits imprim\u00e9s\" class=\"wp-image-5056\" srcset=\"https:\/\/www.topfastpcb.com\/wp-content\/uploads\/2026\/01\/PCB-Failures-1.jpg 600w, https:\/\/www.topfastpcb.com\/wp-content\/uploads\/2026\/01\/PCB-Failures-1-300x169.jpg 300w, https:\/\/www.topfastpcb.com\/wp-content\/uploads\/2026\/01\/PCB-Failures-1-18x10.jpg 18w\" sizes=\"auto, (max-width: 600px) 100vw, 600px\" \/><\/figure><\/div><h2 class=\"wp-block-heading\"><span class=\"ez-toc-section\" id=\"Design_Factors_That_Increase_Via_Crack_Risk\"><\/span>Facteurs de conception qui augmentent le risque de fissures Via<span class=\"ez-toc-section-end\"><\/span><\/h2><p>Certaines d\u00e9cisions en mati\u00e8re de conception augmentent consid\u00e9rablement les risques.<\/p><h3 class=\"wp-block-heading\"><span class=\"ez-toc-section\" id=\"High-Risk_Design_Choices\"><\/span>Choix de conception \u00e0 haut risque<span class=\"ez-toc-section-end\"><\/span><\/h3><ul class=\"wp-block-list\"><li>Tr\u00e8s petits diam\u00e8tres de passage<\/li>\n\n<li>Faible \u00e9paisseur du circuit imprim\u00e9 avec des vias profonds<\/li>\n\n<li>Grands plans de cuivre sans relief<\/li>\n\n<li>Structures denses via-in-pad<\/li><\/ul><p>L'examen de la conception pour la fiabilit\u00e9 est essentiel.<\/p><h2 class=\"wp-block-heading\"><span class=\"ez-toc-section\" id=\"Manufacturing_Factors_Contributing_to_Via_Cracks\"><\/span>Facteurs de fabrication contribuant aux fissures Via<span class=\"ez-toc-section-end\"><\/span><\/h2><h3 class=\"wp-block-heading\"><span class=\"ez-toc-section\" id=\"Drilling_Quality\"><\/span>Qualit\u00e9 du forage<span class=\"ez-toc-section-end\"><\/span><\/h3><p>Les traces de per\u00e7age, les parois rugueuses des trous ou l'arrachement des fibres affaiblissent l'adh\u00e9rence du cuivre.<\/p><p><em>Comparaison :<\/em><br><strong><a href=\"https:\/\/www.topfastpcb.com\/fr\/blog\/pcb-drilling-vs-laser-drilling\/\">Per\u00e7age de circuits imprim\u00e9s et per\u00e7age au laser<\/a><\/strong><\/p><h3 class=\"wp-block-heading\"><span class=\"ez-toc-section\" id=\"Inadequate_Desmear_Process\"><\/span>Processus de d\u00e9maculage inad\u00e9quat<span class=\"ez-toc-section-end\"><\/span><\/h3><p>Un mauvais d\u00e9sencrassement emp\u00eache une bonne liaison du cuivre au di\u00e9lectrique.<\/p><h3 class=\"wp-block-heading\"><span class=\"ez-toc-section\" id=\"Plating_Stress_Control\"><\/span>Contr\u00f4le des contraintes de placage<span class=\"ez-toc-section-end\"><\/span><\/h3><p>Une mauvaise chimie de d\u00e9p\u00f4t peut introduire des tensions internes dans les d\u00e9p\u00f4ts de cuivre.<\/p><h2 class=\"wp-block-heading\"><span class=\"ez-toc-section\" id=\"How_Via_Cracks_Are_Detected\"><\/span>Comment les fissures de Via sont-elles d\u00e9tect\u00e9es ?<span class=\"ez-toc-section-end\"><\/span><\/h2><p>Les fissures Via sont rarement d\u00e9tect\u00e9es par une simple inspection de la surface.<\/p><h3 class=\"wp-block-heading\"><span class=\"ez-toc-section\" id=\"Common_Detection_Methods\"><\/span>M\u00e9thodes de d\u00e9tection courantes<span class=\"ez-toc-section-end\"><\/span><\/h3><ul class=\"wp-block-list\"><li>Essai de contrainte thermique<\/li>\n\n<li>Analyse des microsections<\/li>\n\n<li>Essai \u00e9lectrique apr\u00e8s cyclage<\/li>\n\n<li>Inspection par rayons X (efficacit\u00e9 limit\u00e9e)<\/li><\/ul><p><em>Vue d'ensemble de l'inspection :<\/em><br><strong><a href=\"https:\/\/www.topfastpcb.com\/fr\/blog\/pcb-inspection-and-testing\/\">Inspection et test des PCB expliqu\u00e9s<\/a><\/strong><\/p><h2 class=\"wp-block-heading\"><span class=\"ez-toc-section\" id=\"Preventing_Cracked_Vias_and_Barrel_Cracks\"><\/span>Pr\u00e9vention des fissures dans les tuyaux et des fissures dans les tonneaux<span class=\"ez-toc-section-end\"><\/span><\/h2><h3 class=\"wp-block-heading\"><span class=\"ez-toc-section\" id=\"Design-Level_Prevention\"><\/span>Pr\u00e9vention au niveau de la conception<span class=\"ez-toc-section-end\"><\/span><\/h3><ul class=\"wp-block-list\"><li>Diam\u00e8tre de passage ad\u00e9quat<\/li>\n\n<li>Rapport d'aspect contr\u00f4l\u00e9<\/li>\n\n<li>Mod\u00e8les de relief thermique<\/li><\/ul><h3 class=\"wp-block-heading\"><span class=\"ez-toc-section\" id=\"Process-Level_Prevention\"><\/span>Pr\u00e9vention au niveau du processus<span class=\"ez-toc-section-end\"><\/span><\/h3><ul class=\"wp-block-list\"><li>Param\u00e8tres de forage optimis\u00e9s<\/li>\n\n<li>\u00c9paisseur uniforme de la couche de cuivre<\/li>\n\n<li>Chimie de placage sous contrainte<\/li><\/ul><h3 class=\"wp-block-heading\"><span class=\"ez-toc-section\" id=\"Material_Selection\"><\/span>S\u00e9lection des mat\u00e9riaux<span class=\"ez-toc-section-end\"><\/span><\/h3><ul class=\"wp-block-list\"><li>Mat\u00e9riaux \u00e0 faible dilatation sur l'axe Z<\/li>\n\n<li>Stratifi\u00e9s \u00e0 haute teneur en Tg pour la stabilit\u00e9 thermique<\/li><\/ul><p>Les fabricants comme TOPFAST int\u00e8grent les consid\u00e9rations de fiabilit\u00e9 d\u00e8s le d\u00e9but de la planification des processus.<\/p><div class=\"wp-block-image\"><figure class=\"aligncenter size-full\"><img loading=\"lazy\" decoding=\"async\" width=\"600\" height=\"337\" src=\"https:\/\/www.topfastpcb.com\/wp-content\/uploads\/2026\/01\/PCB-Failures-2.jpg\" alt=\"D\u00e9faillances des circuits imprim\u00e9s\" class=\"wp-image-5057\" srcset=\"https:\/\/www.topfastpcb.com\/wp-content\/uploads\/2026\/01\/PCB-Failures-2.jpg 600w, https:\/\/www.topfastpcb.com\/wp-content\/uploads\/2026\/01\/PCB-Failures-2-300x169.jpg 300w, https:\/\/www.topfastpcb.com\/wp-content\/uploads\/2026\/01\/PCB-Failures-2-18x10.jpg 18w\" sizes=\"auto, (max-width: 600px) 100vw, 600px\" \/><\/figure><\/div><h2 class=\"wp-block-heading\"><span class=\"ez-toc-section\" id=\"Relationship_to_Other_PCB_Failure_Modes\"><\/span>Relation avec d'autres modes de d\u00e9faillance des circuits imprim\u00e9s<span class=\"ez-toc-section-end\"><\/span><\/h2><p>Les fissures Via coexistent souvent avec :<\/p><ul class=\"wp-block-list\"><li>D\u00e9collement<\/li>\n\n<li>Formation de CAF<\/li>\n\n<li>Circuits ouverts intermittents<\/li><\/ul><p><em>Sujet connexe :<\/em><br><strong><a href=\"https:\/\/www.topfastpcb.com\/fr\/blog\/pcb-delamination-causes-prevention\/\">D\u00e9collement des PCB : causes et pr\u00e9vention<\/a><\/strong><\/p><h2 class=\"wp-block-heading\"><span class=\"ez-toc-section\" id=\"Conclusion\"><\/span>Conclusion<span class=\"ez-toc-section-end\"><\/span><\/h2><p>Les vias fissur\u00e9s et les fissures en tonneau ne sont pas des d\u00e9fauts al\u00e9atoires mais des r\u00e9sultats pr\u00e9visibles de <strong>les contraintes thermiques, les d\u00e9cisions de conception et les limites du processus<\/strong>.<\/p><p>A travers :<\/p><ul class=\"wp-block-list\"><li>Pratiques de conception appropri\u00e9es<\/li>\n\n<li>Proc\u00e9d\u00e9s de fabrication contr\u00f4l\u00e9s<\/li>\n\n<li>S\u00e9lection appropri\u00e9e des mat\u00e9riaux<\/li><\/ul><p>Leur fr\u00e9quence peut \u00eatre r\u00e9duite de mani\u00e8re significative.<\/p><h2 class=\"wp-block-heading\"><span class=\"ez-toc-section\" id=\"Via_Cracks_in_PCB_FAQ\"><\/span>Via Cracks in PCB FAQ<span class=\"ez-toc-section-end\"><\/span><\/h2><div class=\"schema-faq wp-block-yoast-faq-block\"><div class=\"schema-faq-section\" id=\"faq-question-1768981138484\"><strong class=\"schema-faq-question\">Q : Les fissures via peuvent-elles \u00eatre r\u00e9par\u00e9es ?<\/strong> <p class=\"schema-faq-answer\">R : Non. Une fois fissur\u00e9s, les vias ne peuvent pas \u00eatre r\u00e9par\u00e9s de mani\u00e8re fiable.<\/p> <\/div> <div class=\"schema-faq-section\" id=\"faq-question-1768981208332\"><strong class=\"schema-faq-question\">Q : <strong>Toutes les fissures via entra\u00eenent-elles une d\u00e9faillance imm\u00e9diate ?<\/strong><\/strong> <p class=\"schema-faq-answer\">R : Non. Beaucoup sont latents et intermittents.<\/p> <\/div> <div class=\"schema-faq-section\" id=\"faq-question-1768981226138\"><strong class=\"schema-faq-question\">Q : <strong>Le cuivre plus \u00e9pais est-il toujours meilleur ?<\/strong><\/strong> <p class=\"schema-faq-answer\">R : Pas toujours, mais il est essentiel que l'\u00e9paisseur soit suffisante et uniforme.<\/p> <\/div> <div class=\"schema-faq-section\" id=\"faq-question-1768981244482\"><strong class=\"schema-faq-question\">Q : <strong>Les fissures de via sont-elles plus fr\u00e9quentes dans les assemblages sans plomb ?<\/strong><\/strong> <p class=\"schema-faq-answer\">R : Oui, en raison des temp\u00e9ratures de refusion plus \u00e9lev\u00e9es.<\/p> <\/div> <div class=\"schema-faq-section\" id=\"faq-question-1768981259852\"><strong class=\"schema-faq-question\">Q : <strong>Les rayons X permettent-ils de d\u00e9tecter les fissures ?<\/strong><\/strong> <p class=\"schema-faq-answer\">R : En g\u00e9n\u00e9ral, non, sauf si les fissures sont importantes.<\/p> <\/div> <\/div>","protected":false},"excerpt":{"rendered":"<p>Les vias fissur\u00e9s et les fissures en tonneau sont des d\u00e9faillances fr\u00e9quentes des circuits imprim\u00e9s. Cet article explore leurs causes profondes, les techniques de d\u00e9tection et les mesures pr\u00e9ventives que les fabricants emploient pour garantir la fiabilit\u00e9.<\/p>","protected":false},"author":1,"featured_media":5058,"comment_status":"closed","ping_status":"closed","sticky":false,"template":"","format":"standard","meta":{"footnotes":""},"categories":[108],"tags":[438],"class_list":["post-5054","post","type-post","status-publish","format-standard","has-post-thumbnail","hentry","category-news","tag-pcb-failures"],"yoast_head":"<!-- This site is optimized with the Yoast SEO plugin v25.1 - https:\/\/yoast.com\/wordpress\/plugins\/seo\/ -->\n<title>Cracked Vias and Barrel Cracks in PCB: Causes, Detection, and Prevention<\/title>\n<meta name=\"description\" content=\"Cracked vias and barrel cracks are common PCB reliability failures. 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Can via cracks be repaired?","answerCount":1,"acceptedAnswer":{"@type":"Answer","text":"A: No. Once cracked, vias cannot be reliably repaired.","inLanguage":"fr-FR"},"inLanguage":"fr-FR"},{"@type":"Question","@id":"https:\/\/www.topfastpcb.com\/blog\/cracked-vias-and-barrel-cracks-in-pcb\/#faq-question-1768981208332","position":2,"url":"https:\/\/www.topfastpcb.com\/blog\/cracked-vias-and-barrel-cracks-in-pcb\/#faq-question-1768981208332","name":"Q: Do all via cracks cause immediate failure?","answerCount":1,"acceptedAnswer":{"@type":"Answer","text":"A: No. Many are latent and intermittent.","inLanguage":"fr-FR"},"inLanguage":"fr-FR"},{"@type":"Question","@id":"https:\/\/www.topfastpcb.com\/blog\/cracked-vias-and-barrel-cracks-in-pcb\/#faq-question-1768981226138","position":3,"url":"https:\/\/www.topfastpcb.com\/blog\/cracked-vias-and-barrel-cracks-in-pcb\/#faq-question-1768981226138","name":"Q: Is thicker copper always 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Usually not unless cracks are 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