{"id":117302,"date":"2025-05-30T16:54:45","date_gmt":"2025-05-30T14:54:45","guid":{"rendered":"https:\/\/step-lab.com\/?page_id=117302"},"modified":"2025-05-30T16:54:45","modified_gmt":"2025-05-30T14:54:45","slug":"iso-178","status":"publish","type":"page","link":"https:\/\/step-lab.com\/fr\/normes-iso\/iso-178\/","title":{"rendered":"ISO 178"},"content":{"rendered":"\n<style type=\"text\/css\" data-created_by=\"avia_inline_auto\" id=\"style-css-av-12hunhy-5a34906e2774806c11080b9455f694ee\">\n.avia-section.av-12hunhy-5a34906e2774806c11080b9455f694ee{\nbackground-repeat:no-repeat;\nbackground-image:url(https:\/\/step-lab.com\/wp-content\/uploads\/2023\/11\/background-for-standards.jpg);\nbackground-position:0% 0%;\nbackground-attachment:scroll;\n}\n.avia-section.av-12hunhy-5a34906e2774806c11080b9455f694ee .av-section-color-overlay{\nopacity:0.4;\nbackground-color:#0a0a0a;\n}\n<\/style>\n<div id='av_section_1'  class='avia-section av-12hunhy-5a34906e2774806c11080b9455f694ee main_color avia-section-default avia-no-border-styling  avia-builder-el-0  el_before_av_one_fifth  avia-builder-el-first  avia-full-stretch avia-bg-style-scroll av-section-color-overlay-active av-minimum-height av-minimum-height-custom av-height-custom  container_wrap fullsize'  data-section-bg-repeat='stretch' data-av_minimum_height_px='400'><div class=\"av-section-color-overlay-wrap\"><div class=\"av-section-color-overlay\"><\/div><div class='container av-section-cont-open' style='height:400px'><main  role=\"main\" itemprop=\"mainContentOfPage\"  class='template-page content  av-content-full alpha units'><div class='post-entry post-entry-type-page post-entry-117302'><div class='entry-content-wrapper clearfix'>\n\n<style type=\"text\/css\" data-created_by=\"avia_inline_auto\" id=\"style-css-av-lp13jptg-63eddbf62092de98163adfceeefc58b4\">\n#top .av_textblock_section.av-lp13jptg-63eddbf62092de98163adfceeefc58b4 .avia_textblock{\ncolor:#ffffff;\n}\n<\/style>\n<section  class='av_textblock_section av-lp13jptg-63eddbf62092de98163adfceeefc58b4 '   itemscope=\"itemscope\" itemtype=\"https:\/\/schema.org\/CreativeWork\" ><div class='avia_textblock av_inherit_color'  itemprop=\"text\" ><h1 style=\"text-align: center;\"><span class=\"ez-toc-section\" id=\"ISO_178\"><\/span>ISO 178<span class=\"ez-toc-section-end\"><\/span><\/h1>\n<\/div><\/section>\n\n<style type=\"text\/css\" data-created_by=\"avia_inline_auto\" id=\"style-css-av-s1zpau-de7e9c4e65155d0786b727bb6c986f5f\">\n#top .hr.hr-invisible.av-s1zpau-de7e9c4e65155d0786b727bb6c986f5f{\nheight:20px;\n}\n<\/style>\n<div  class='hr av-s1zpau-de7e9c4e65155d0786b727bb6c986f5f hr-invisible  avia-builder-el-2  el_after_av_textblock  el_before_av_textblock '><span class='hr-inner '><span class=\"hr-inner-style\"><\/span><\/span><\/div>\n\n<style type=\"text\/css\" data-created_by=\"avia_inline_auto\" id=\"style-css-av-lp13jyh5-4a9392d1352b953e455a9920b048676c\">\n#top .av_textblock_section.av-lp13jyh5-4a9392d1352b953e455a9920b048676c .avia_textblock{\ncolor:#ffffff;\n}\n<\/style>\n<section  class='av_textblock_section av-lp13jyh5-4a9392d1352b953e455a9920b048676c '   itemscope=\"itemscope\" itemtype=\"https:\/\/schema.org\/CreativeWork\" ><div class='avia_textblock av_inherit_color'  itemprop=\"text\" ><h2 class=\"av-special-heading-tag \" style=\"text-align: center;\"><span class=\"ez-toc-section\" id=\"Essais_de_flexion_sur_les_matieres_plastiques\"><\/span>Essais de flexion sur les mati\u00e8res plastiques<span class=\"ez-toc-section-end\"><\/span><\/h2>\n<\/div><\/section>\n<\/div><\/div><\/main><!-- close content main element --><\/div><\/div><\/div><div id='after_section_1'  class='main_color av_default_container_wrap container_wrap fullsize'  ><div class='container av-section-cont-open' ><div class='template-page content  av-content-full alpha units'><div class='post-entry post-entry-type-page post-entry-117302'><div class='entry-content-wrapper clearfix'>\n<div  class='flex_column av-a2t75hy-8867e5f8db00a9f77dcd9d04a327d3c0 av_one_fifth  avia-builder-el-4  el_after_av_section  el_before_av_three_fifth  avia-builder-el-first  first flex_column_div  '     ><\/div>\n<div  class='flex_column av-9h8y6za-389868629b92df4682dd5622a3abb370 av_three_fifth  avia-builder-el-5  el_after_av_one_fifth  el_before_av_one_fifth  flex_column_div  '     ><p>\n<style type=\"text\/css\" data-created_by=\"avia_inline_auto\" id=\"style-css-av-lnimbzcf-6b2a84a0193d0ca2da52322a6c981693\">\n#top .av_textblock_section.av-lnimbzcf-6b2a84a0193d0ca2da52322a6c981693 .avia_textblock{\nfont-size:18px;\n}\n<\/style>\n<section  class='av_textblock_section av-lnimbzcf-6b2a84a0193d0ca2da52322a6c981693 '   itemscope=\"itemscope\" itemtype=\"https:\/\/schema.org\/CreativeWork\" ><div class='avia_textblock'  itemprop=\"text\" ><p>Les normes ISO sont essentielles pour garantir des essais de mat\u00e9riaux uniformes, fiables et comparables au niveau international.<br \/> Ils d\u00e9finissent des m\u00e9thodes et des param\u00e8tres pour tester les propri\u00e9t\u00e9s m\u00e9caniques, physiques et chimiques, garantissant ainsi la qualit\u00e9 et la s\u00e9curit\u00e9.<\/p>\n<p>Dans le domaine des plastiques, l&rsquo;<strong>ISO 178<\/strong> est la principale norme pour les essais de flexion, qui sont essentiels pour \u00e9valuer la r\u00e9sistance et la rigidit\u00e9 des mat\u00e9riaux.<\/p>\n<div id=\"ez-toc-container\" class=\"ez-toc-v2_0_82_2 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 ez-toc-toggle\" style=\"cursor:pointer\">PAGE CONTENT<\/p>\n<span class=\"ez-toc-title-toggle\"><a href=\"#\" class=\"ez-toc-pull-right ez-toc-btn ez-toc-btn-xs ez-toc-btn-default ez-toc-toggle\" aria-label=\"Toggle Table of Content\"><span class=\"ez-toc-js-icon-con\"><span class=\"\"><span class=\"eztoc-hide\" style=\"display:none;\">Toggle<\/span><span class=\"ez-toc-icon-toggle-span\"><svg style=\"fill: #a81010;color:#a81010\" xmlns=\"http:\/\/www.w3.org\/2000\/svg\" class=\"list-377408\" width=\"20px\" height=\"20px\" viewBox=\"0 0 24 24\" fill=\"none\"><path d=\"M6 6H4v2h2V6zm14 0H8v2h12V6zM4 11h2v2H4v-2zm16 0H8v2h12v-2zM4 16h2v2H4v-2zm16 0H8v2h12v-2z\" fill=\"currentColor\"><\/path><\/svg><svg style=\"fill: #a81010;color:#a81010\" class=\"arrow-unsorted-368013\" xmlns=\"http:\/\/www.w3.org\/2000\/svg\" width=\"10px\" height=\"10px\" viewBox=\"0 0 24 24\" version=\"1.2\" baseProfile=\"tiny\"><path d=\"M18.2 9.3l-6.2-6.3-6.2 6.3c-.2.2-.3.4-.3.7s.1.5.3.7c.2.2.4.3.7.3h11c.3 0 .5-.1.7-.3.2-.2.3-.5.3-.7s-.1-.5-.3-.7zM5.8 14.7l6.2 6.3 6.2-6.3c.2-.2.3-.5.3-.7s-.1-.5-.3-.7c-.2-.2-.4-.3-.7-.3h-11c-.3 0-.5.1-.7.3-.2.2-.3.5-.3.7s.1.5.3.7z\"\/><\/svg><\/span><\/span><\/span><\/a><\/span><\/div>\n<nav><ul class='ez-toc-list ez-toc-list-level-1 ' ><li class='ez-toc-page-1 ez-toc-heading-level-1'><a class=\"ez-toc-link ez-toc-heading-1\" href=\"https:\/\/step-lab.com\/fr\/normes-iso\/iso-178\/#ISO_178\" >ISO 178<\/a><ul class='ez-toc-list-level-2' ><li class='ez-toc-heading-level-2'><a class=\"ez-toc-link ez-toc-heading-2\" href=\"https:\/\/step-lab.com\/fr\/normes-iso\/iso-178\/#Essais_de_flexion_sur_les_matieres_plastiques\" >Essais de flexion sur les mati\u00e8res plastiques<\/a><ul class='ez-toc-list-level-3' ><li class='ez-toc-heading-level-3'><a class=\"ez-toc-link ez-toc-heading-3\" href=\"https:\/\/step-lab.com\/fr\/normes-iso\/iso-178\/#Quest-ce_que_la_norme_ISO_178\" >Qu&rsquo;est-ce que la norme ISO 178 ?<\/a><\/li><li class='ez-toc-page-1 ez-toc-heading-level-3'><a class=\"ez-toc-link ez-toc-heading-4\" href=\"https:\/\/step-lab.com\/fr\/normes-iso\/iso-178\/#Que_mesure_la_norme_ISO_178\" >Que mesure la norme ISO 178 ?<\/a><\/li><li class='ez-toc-page-1 ez-toc-heading-level-3'><a class=\"ez-toc-link ez-toc-heading-5\" href=\"https:\/\/step-lab.com\/fr\/normes-iso\/iso-178\/#ISO_178_%E2%80%93_Exigences_techniques\" >ISO 178 &#8211; Exigences techniques<\/a><\/li><li class='ez-toc-page-1 ez-toc-heading-level-3'><a class=\"ez-toc-link ez-toc-heading-6\" href=\"https:\/\/step-lab.com\/fr\/normes-iso\/iso-178\/#ISO_178_%E2%80%93_Equipement_requis\" >ISO 178 &#8211; \u00c9quipement requis<\/a><\/li><li class='ez-toc-page-1 ez-toc-heading-level-3'><a class=\"ez-toc-link ez-toc-heading-7\" href=\"https:\/\/step-lab.com\/fr\/normes-iso\/iso-178\/#ISO_178_%E2%80%93_Specimens_dessai\" >ISO 178 &#8211; Sp\u00e9cimens d&rsquo;essai<\/a><\/li><li class='ez-toc-page-1 ez-toc-heading-level-3'><a class=\"ez-toc-link ez-toc-heading-8\" href=\"https:\/\/step-lab.com\/fr\/normes-iso\/iso-178\/#ISO_178_%E2%80%93_Methode_dessai\" >ISO 178 &#8211; M\u00e9thode d&rsquo;essai<\/a><\/li><li class='ez-toc-page-1 ez-toc-heading-level-3'><a class=\"ez-toc-link ez-toc-heading-9\" href=\"https:\/\/step-lab.com\/fr\/normes-iso\/iso-178\/#Machine_dessai_pour_ISO_178\" >Machine d&rsquo;essai pour ISO 178<\/a><\/li><\/ul><\/li><\/ul><\/li><\/ul><\/nav><\/div>\n\n<\/div><\/section><br \/>\n\n<style type=\"text\/css\" data-created_by=\"avia_inline_auto\" id=\"style-css-av-lnip5g4k-6698dba274103a68d30e9d05a1c5838f\">\n#top .hr.hr-invisible.av-lnip5g4k-6698dba274103a68d30e9d05a1c5838f{\nheight:50px;\n}\n<\/style>\n<div  class='hr av-lnip5g4k-6698dba274103a68d30e9d05a1c5838f hr-invisible'><span class='hr-inner '><span class=\"hr-inner-style\"><\/span><\/span><\/div><br \/>\n\n<style type=\"text\/css\" data-created_by=\"avia_inline_auto\" id=\"style-css-av-m9gx9n09-87f9c251747714af7345907eed6111a6\">\n#top .av_textblock_section.av-m9gx9n09-87f9c251747714af7345907eed6111a6 .avia_textblock{\nfont-size:18px;\n}\n<\/style>\n<section  class='av_textblock_section av-m9gx9n09-87f9c251747714af7345907eed6111a6 '   itemscope=\"itemscope\" itemtype=\"https:\/\/schema.org\/CreativeWork\" ><div class='avia_textblock'  itemprop=\"text\" ><h3><span class=\"ez-toc-section\" id=\"Quest-ce_que_la_norme_ISO_178\"><\/span>Qu&rsquo;est-ce que la norme ISO 178 ?<br \/><span class=\"ez-toc-section-end\"><\/span><\/h3>\n<p>L&rsquo;ISO 178 est une norme internationale qui d\u00e9finit la m\u00e9thode d&rsquo;essai pour <strong>d\u00e9terminer les propri\u00e9t\u00e9s de flexion des plastiques rigides et semi-rigides.<\/strong> L&rsquo;essai consiste \u00e0 appliquer une force concentr\u00e9e au centre d&rsquo;une \u00e9prouvette reposant sur deux supports, de sorte que l&rsquo;\u00e9prouvette est sollicit\u00e9e en <strong>trois points de contact <\/strong> : les deux supports et le point d&rsquo;application de la charge.<\/p>\n<p>Ce test mesure principalement <strong> deux param\u00e8tres de base<\/strong> : le <strong>module de flexion<\/strong>, qui indique la rigidit\u00e9 du mat\u00e9riau sous une contrainte de flexion, et la <strong>r\u00e9sistance \u00e0 la flexion<\/strong>, qui est la charge maximale que le mat\u00e9riau peut supporter avant de se rompre ou de se d\u00e9former de mani\u00e8re permanente.<\/p>\n<p>La norme est essentielle pour \u00e9valuer le comportement m\u00e9canique des plastiques dans les applications o\u00f9 les contraintes de flexion sont critiques, telles que les composants structurels, les bo\u00eetiers et les pi\u00e8ces de machines.<br \/> En outre, la norme ISO 178 fournit des lignes directrices pr\u00e9cises sur la taille des \u00e9prouvettes, les vitesses d&rsquo;essai, les conditions environnementales et les calculs \u00e0 effectuer pour garantir la r\u00e9p\u00e9tabilit\u00e9 et la comparabilit\u00e9 des r\u00e9sultats.<\/p>\n<h3><span class=\"ez-toc-section\" id=\"Que_mesure_la_norme_ISO_178\"><\/span>Que mesure la norme ISO 178 ?<br \/><span class=\"ez-toc-section-end\"><\/span><\/h3>\n<p>L&rsquo;ISO 178 mesure les propri\u00e9t\u00e9s m\u00e9caniques de flexion des plastiques, fournissant des donn\u00e9es essentielles pour comprendre comment un mat\u00e9riau r\u00e9agit \u00e0 une contrainte de flexion.<br \/> En particulier, les <strong>principaux param\u00e8tres mesur\u00e9s<\/strong> sont les suivants:<\/p>\n<ul>\n<li><strong>Module de flexion<\/strong> (ou module d&rsquo;\u00e9lasticit\u00e9) : indique la rigidit\u00e9 du mat\u00e9riau lors d&rsquo;une d\u00e9formation \u00e9lastique sous une charge de flexion.<br \/> Il s&rsquo;agit du rapport entre la contrainte de flexion et l&rsquo;unit\u00e9 de d\u00e9formation, et repr\u00e9sente la capacit\u00e9 du mat\u00e9riau \u00e0 r\u00e9sister \u00e0 la flexion sans subir de d\u00e9formation permanente.<\/li>\n<li><strong>R\u00e9sistance \u00e0 la flexion<\/strong> : c&rsquo;est la valeur maximale de la contrainte que le mat\u00e9riau peut supporter avant de se rompre ou de subir une d\u00e9formation plastique permanente.<br \/> Cette valeur est cruciale pour la conception de composants soumis \u00e0 des charges de flexion.<\/li>\n<li><strong>D\u00e9formation en flexion<\/strong> : mesure la quantit\u00e9 de d\u00e9formation ou de d\u00e9placement subie par l&rsquo;\u00e9chantillon sous charge, utile pour \u00e9valuer la ductilit\u00e9 ou la fragilit\u00e9 du mat\u00e9riau.<\/li>\n<\/ul>\n<p><strong>L&rsquo;objectif <\/strong> est d&rsquo;amener <strong>l&rsquo;\u00e9chantillon \u00e0 se d\u00e9former jusqu&rsquo;\u00e0 la rupture<\/strong> ou, si cela ne se produit pas, jusqu&rsquo;\u00e0 ce qu&rsquo;une d\u00e9formation en flexion de 5 % soit atteinte.<\/p>\n<p>La norme ISO 178 sp\u00e9cifie \u00e9galement <strong>deux m\u00e9thodes d&rsquo;essai<\/strong> : la <strong>m\u00e9thode A<\/strong>, qui implique une vitesse de d\u00e9formation constante tout au long de l&rsquo;essai, et la <strong>m\u00e9thode B<\/strong>, qui commence avec une vitesse et l&rsquo;augmente une fois que la r\u00e9gion \u00e9lastique initiale du mat\u00e9riau a \u00e9t\u00e9 d\u00e9pass\u00e9e.<\/p>\n<\/div><\/section><br \/>\n\n<style type=\"text\/css\" data-created_by=\"avia_inline_auto\" id=\"style-css-av-lnipgqfx-91e9858fdc3ae34727b71d7d544b98c0\">\n#top .hr.hr-invisible.av-lnipgqfx-91e9858fdc3ae34727b71d7d544b98c0{\nheight:10px;\n}\n<\/style>\n<div  class='hr av-lnipgqfx-91e9858fdc3ae34727b71d7d544b98c0 hr-invisible'><span class='hr-inner '><span class=\"hr-inner-style\"><\/span><\/span><\/div><br \/>\n\n<style type=\"text\/css\" data-created_by=\"avia_inline_auto\" id=\"style-css-av-1968zyvh-33a6908040524b0dfd5989c327fdc6e3\">\n.avia-image-container.av-1968zyvh-33a6908040524b0dfd5989c327fdc6e3 img.avia_image{\nbox-shadow:none;\n}\n.avia-image-container.av-1968zyvh-33a6908040524b0dfd5989c327fdc6e3 .av-image-caption-overlay-center{\ncolor:#ffffff;\n}\n<\/style>\n<div  class='avia-image-container av-1968zyvh-33a6908040524b0dfd5989c327fdc6e3 av-styling- avia-align-center'   itemprop=\"image\" itemscope=\"itemscope\" itemtype=\"https:\/\/schema.org\/ImageObject\" ><div class=\"avia-image-container-inner\"><div class=\"avia-image-overlay-wrap\"><img decoding=\"async\" fetchpriority=\"high\" class='wp-image-117276 avia-img-lazy-loading-not-117276 avia_image ' src=\"https:\/\/step-lab.com\/wp-content\/uploads\/2025\/05\/ISO-178.jpg\" alt='' title='ISO 178'  height=\"447\" width=\"795\"  itemprop=\"thumbnailUrl\" srcset=\"https:\/\/step-lab.com\/wp-content\/uploads\/2025\/05\/ISO-178.jpg 795w, https:\/\/step-lab.com\/wp-content\/uploads\/2025\/05\/ISO-178-300x169.jpg 300w, https:\/\/step-lab.com\/wp-content\/uploads\/2025\/05\/ISO-178-768x432.jpg 768w, https:\/\/step-lab.com\/wp-content\/uploads\/2025\/05\/ISO-178-705x396.jpg 705w\" sizes=\"(max-width: 795px) 100vw, 795px\" \/><\/div><\/div><\/div><br \/>\n\n<style type=\"text\/css\" data-created_by=\"avia_inline_auto\" id=\"style-css-av-6gap1fx-3a282e62921a76e6dba05298cf79d61c\">\n#top .hr.hr-invisible.av-6gap1fx-3a282e62921a76e6dba05298cf79d61c{\nheight:20px;\n}\n<\/style>\n<div  class='hr av-6gap1fx-3a282e62921a76e6dba05298cf79d61c hr-invisible'><span class='hr-inner '><span class=\"hr-inner-style\"><\/span><\/span><\/div><br \/>\n\n<style type=\"text\/css\" data-created_by=\"avia_inline_auto\" id=\"style-css-av-mbaj4yt0-b7657be1e1f69eaae801b7404c98a55b\">\n#top .av_textblock_section.av-mbaj4yt0-b7657be1e1f69eaae801b7404c98a55b .avia_textblock{\nfont-size:18px;\n}\n<\/style>\n<section  class='av_textblock_section av-mbaj4yt0-b7657be1e1f69eaae801b7404c98a55b '   itemscope=\"itemscope\" itemtype=\"https:\/\/schema.org\/CreativeWork\" ><div class='avia_textblock'  itemprop=\"text\" ><h3><span class=\"ez-toc-section\" id=\"ISO_178_%E2%80%93_Exigences_techniques\"><\/span>ISO 178 &#8211; Exigences techniques<br \/><span class=\"ez-toc-section-end\"><\/span><\/h3>\n<p>La norme ISO 178 sp\u00e9cifie des <strong>exigences de pr\u00e9cision bien d\u00e9finies<\/strong>, tant en ce qui concerne le contr\u00f4le du mouvement que la configuration de l&rsquo;\u00e9quipement d&rsquo;essai.<\/p>\n<p>La pr\u00e9cision du mouvement de la barre transversale doit \u00eatre telle qu&rsquo;elle permette une <strong>r\u00e9solution d&rsquo;au moins 1 % de la d\u00e9formation en flexion<\/strong> utilis\u00e9e pour le calcul du module d&rsquo;\u00e9lasticit\u00e9.<\/p>\n<p>Les <strong>vitesses d&rsquo;essai <\/strong> standard sont les suivantes<\/p>\n<ul>\n<li><strong>1 mm\/min<\/strong> pour des \u00e9paisseurs d&rsquo;\u00e9chantillons comprises entre 1 mm et 3,5 mm<\/li>\n<li>La norme autorise une <strong> tol\u00e9rance de \u00b120%<\/strong> sur ces vitesses.<\/li>\n<\/ul>\n<p>Pour mesurer la force, les <strong>capteurs de pesage<\/strong> doivent offrir une <strong>sensibilit\u00e9 et une r\u00e9solution \u00e9lev\u00e9es<\/strong>, en accord avec la pr\u00e9cision requise pour le calcul du module d&rsquo;\u00e9lasticit\u00e9 et d&rsquo;autres param\u00e8tres.<\/p>\n<h3><span class=\"ez-toc-section\" id=\"ISO_178_%E2%80%93_Equipement_requis\"><\/span>ISO 178 &#8211; \u00c9quipement requis<br \/><span class=\"ez-toc-section-end\"><\/span><\/h3>\n<p>Les essais conformes \u00e0 la norme ISO 178 sont g\u00e9n\u00e9ralement r\u00e9alis\u00e9s sur des <strong>bancs d&rsquo;essai<\/strong>, car les forces requises sont relativement faibles.<br \/> La machine d&rsquo;essai doit pouvoir maintenir une <strong>vitesse constante comprise entre 1 et 500 mm\/min<\/strong>, tout en respectant les tol\u00e9rances sp\u00e9cifi\u00e9es dans la norme.<br \/> Le dispositif de mesure de la force (cellule de charge) doit \u00eatre conforme \u00e0 la classe 1 de la norme ISO 7500-1 pour la gamme de force utilis\u00e9e.<br \/> Il est donc essentiel que le laboratoire connaisse pr\u00e9cis\u00e9ment les forces minimales et maximales \u00e0 appliquer, afin de s\u00e9lectionner un capteur de pesage adapt\u00e9, tant en termes de capacit\u00e9 que de plage de v\u00e9rification.<\/p>\n<p>L&rsquo;<strong>\u00e9quipement pour l&rsquo;essai de flexion trois points <\/strong> doit r\u00e9pondre aux <strong>conditions <\/strong> suivantes :<\/p>\n<ul>\n<li>Les deux <strong>supports lat\u00e9raux<\/strong> doivent \u00eatre <strong>parall\u00e8les <\/strong> avec une tol\u00e9rance de \u00b10,2 mm sur la largeur de l&rsquo;\u00e9chantillon.<\/li>\n<li>La <strong>distance <\/strong> entre les supports (indiqu\u00e9e par \u00ab d \u00bb) doit \u00eatre <strong>ajust\u00e9e <\/strong> en fonction de la taille de l&rsquo;\u00e9chantillon.<\/li>\n<li>Les <strong>rayons de courbure<\/strong> des composants en contact avec l&rsquo;\u00e9chantillon doivent \u00eatre :\n<ul>\n<li><strong>R1 <\/strong> (fl\u00e9chisseur) : 5,0 mm \u00b1 0,1 mm<\/li>\n<li><strong>R2 <\/strong> (supports lat\u00e9raux) :\n<ul>\n<li>2,0 mm \u00b1 0,2 mm pour les \u00e9chantillons dont l&rsquo;\u00e9paisseur est &lt;3 mm<\/li>\n<li>5,0 mm \u00b1 0,2 mm pour une \u00e9paisseur d&rsquo;\u00e9chantillon \u2265 3 mm<\/li>\n<\/ul>\n<\/li>\n<\/ul>\n<\/li>\n<\/ul>\n<p>Ces param\u00e8tres garantissent l&rsquo;uniformit\u00e9 de l&rsquo;essai et la r\u00e9p\u00e9tabilit\u00e9 des r\u00e9sultats obtenus sur des mat\u00e9riaux thermoplastiques rigides et semi-rigides.<\/p>\n<\/div><\/section><\/p><\/div><div  class='flex_column av-8n6uv06-b477c06b8f06684125d57542ba7e65dc av_one_fifth flex_column_div  '     ><\/div><\/p>\n<div  class='flex_column av-3z09qdp-3edc140d512f7c96d2ea303db6ed18c2 av_one_third first flex_column_div  '     ><\/div>\n<div  class='flex_column av-z6vinkd-d31d59313b5d336be7950d16ab3a28df av_one_third flex_column_div  '     ><style type=\"text\/css\" data-created_by=\"avia_inline_auto\" id=\"style-css-av-ts3so7h-004fb57fb371896e034d8f8668bc2a38\">\n.avia-image-container.av-ts3so7h-004fb57fb371896e034d8f8668bc2a38 img.avia_image{\nbox-shadow:none;\n}\n.avia-image-container.av-ts3so7h-004fb57fb371896e034d8f8668bc2a38 .av-image-caption-overlay-center{\ncolor:#ffffff;\n}\n<\/style>\n<div  class='avia-image-container av-ts3so7h-004fb57fb371896e034d8f8668bc2a38 av-styling- avia-align-center'   itemprop=\"image\" itemscope=\"itemscope\" itemtype=\"https:\/\/schema.org\/ImageObject\" ><div class=\"avia-image-container-inner\"><div class=\"avia-image-overlay-wrap\"><img decoding=\"async\" fetchpriority=\"high\" class='wp-image-111292 avia-img-lazy-loading-not-111292 avia_image ' src=\"https:\/\/step-lab.com\/wp-content\/uploads\/2024\/06\/astm-F382.jpg\" alt='' title='astm F382'  height=\"400\" width=\"400\"  itemprop=\"thumbnailUrl\" srcset=\"https:\/\/step-lab.com\/wp-content\/uploads\/2024\/06\/astm-F382.jpg 400w, https:\/\/step-lab.com\/wp-content\/uploads\/2024\/06\/astm-F382-300x300.jpg 300w, https:\/\/step-lab.com\/wp-content\/uploads\/2024\/06\/astm-F382-80x80.jpg 80w, https:\/\/step-lab.com\/wp-content\/uploads\/2024\/06\/astm-F382-36x36.jpg 36w, https:\/\/step-lab.com\/wp-content\/uploads\/2024\/06\/astm-F382-180x180.jpg 180w\" sizes=\"(max-width: 400px) 100vw, 400px\" \/><\/div><\/div><\/div><\/div><div  class='flex_column av-p4rstfx-a6e7b78c495b6e5e417b9e5635fb6e39 av_one_third flex_column_div  '     ><\/div><\/p>\n<div  class='flex_column av-jmp053h-338a32992a8cc10bfce8d8dfcde16b8f av_one_fifth first flex_column_div  '     ><\/div>\n<div  class='flex_column av-ehlkqml-098aa275bdbe48461b04d3f04199e590 av_three_fifth flex_column_div  '     ><style type=\"text\/css\" data-created_by=\"avia_inline_auto\" id=\"style-css-av-mbal0et4-c95ee765728262831fcfa45410d1060f\">\n#top .av_textblock_section.av-mbal0et4-c95ee765728262831fcfa45410d1060f .avia_textblock{\nfont-size:18px;\n}\n<\/style>\n<section  class='av_textblock_section av-mbal0et4-c95ee765728262831fcfa45410d1060f '   itemscope=\"itemscope\" itemtype=\"https:\/\/schema.org\/CreativeWork\" ><div class='avia_textblock'  itemprop=\"text\" ><h3><span class=\"ez-toc-section\" id=\"ISO_178_%E2%80%93_Specimens_dessai\"><\/span>ISO 178 &#8211; Sp\u00e9cimens d&rsquo;essai<span class=\"ez-toc-section-end\"><\/span><\/h3>\n<p>Les <strong>\u00e9chantillons <\/strong> destin\u00e9s \u00e0 \u00eatre soumis \u00e0 un essai de flexion conform\u00e9ment \u00e0 la norme ISO 178 peuvent \u00eatre : <strong>usin\u00e9s \u00e0 partir de feuilles<\/strong> conform\u00e9ment \u00e0 la norme ISO 2818, <strong>moul\u00e9s par compression<\/strong> conform\u00e9ment \u00e0 la norme ISO 293 ou ISO 295, ou <strong>moul\u00e9s par injection<\/strong> conform\u00e9ment \u00e0 la norme ISO 294-1 ou ISO 10724-1.<\/p>\n<p>Les <strong>tailles <\/strong> d&rsquo;\u00e9chantillon pr\u00e9f\u00e9r\u00e9es sont les suivantes :<\/p>\n<ul>\n<li><strong>Longueur <\/strong> : 80 mm \u00b1 2 mm<\/li>\n<li><strong>Largeur <\/strong> : 10 mm \u00b1 0,2 mm<\/li>\n<li><strong>\u00c9paisseur <\/strong> : 4 mm \u00b1 0,2 mm<\/li>\n<\/ul>\n<p>Si ces dimensions ne peuvent \u00eatre respect\u00e9es, <strong>la norme autorise l&rsquo;utilisation d&rsquo;autres largeurs proportionnelles \u00e0 l&rsquo;\u00e9paisseur de l&rsquo;\u00e9chantillon.<\/strong><\/p>\n<h3><span class=\"ez-toc-section\" id=\"ISO_178_%E2%80%93_Methode_dessai\"><\/span>ISO 178 &#8211; M\u00e9thode d&rsquo;essai<br \/><span class=\"ez-toc-section-end\"><\/span><\/h3>\n<p>La distance entre les supports inf\u00e9rieurs (ouverture du dispositif \u00e0 trois points) est configur\u00e9e en fonction de l&rsquo;\u00e9paisseur de l&rsquo;\u00e9chantillon, comme indiqu\u00e9 par la norme.<br \/> Les conditions environnementales de l&rsquo;essai &#8211; par exemple, temp\u00e9rature \u00e9lev\u00e9e ou basse &#8211; doivent \u00eatre d\u00e9termin\u00e9es en fonction du type de mat\u00e9riau test\u00e9 et faire l&rsquo;objet d&rsquo;un accord entre le laboratoire et le client.<br \/> <strong>En l&rsquo;absence de lignes directrices sp\u00e9cifiques, il est fait r\u00e9f\u00e9rence \u00e0 la norme ISO 291 pour les conditions standard.<br \/><\/strong><\/p>\n<p>La norme ISO 178 d\u00e9finit <strong>deux fa\u00e7ons <\/strong> d&rsquo;effectuer le test :<\/p>\n<ul>\n<li><strong>M\u00e9thode A<\/strong> : utilise une <strong>vitesse constante<\/strong> de la barre transversale pendant toute la dur\u00e9e de l&rsquo;essai.<\/li>\n<li><strong>M\u00e9thode B<\/strong> : elle comporte <strong> deux vitesses<\/strong>, une premi\u00e8re pour d\u00e9terminer le module d&rsquo;\u00e9lasticit\u00e9, suivie d&rsquo;une vitesse plus \u00e9lev\u00e9e pour compl\u00e9ter l&rsquo;essai.<\/li>\n<\/ul>\n<p>Apr\u00e8s une phase de pr\u00e9charge, <strong>l&rsquo;\u00e9chantillon est soumis \u00e0 une contrainte jusqu&rsquo;\u00e0 la rupture ou jusqu&rsquo;\u00e0 ce qu&rsquo;une d\u00e9formation en flexion de 5 % soit atteinte<\/strong>, selon ce qui se produit en premier.<br \/> Pendant toute la dur\u00e9e de l&rsquo;essai, les donn\u00e9es de charge et de d\u00e9formation doivent \u00eatre enregistr\u00e9es avec une fr\u00e9quence d&rsquo;acquisition suffisante pour garantir la pr\u00e9cision des r\u00e9sultats.<\/p>\n<p>Il est fortement recommand\u00e9 de <strong> d\u00e9finir une pr\u00e9charge ad\u00e9quate<\/strong> : la force initiale appliqu\u00e9e \u00e0 l&rsquo;\u00e9chantillon avant le d\u00e9but de l&rsquo;essai a un impact direct sur la r\u00e9p\u00e9tabilit\u00e9 et la fiabilit\u00e9 des calculs de d\u00e9formation.<\/p>\n<\/div><\/section><\/div><div  class='flex_column av-dn9nr65-3abacd834f6d1e7305529ef26069f399 av_one_fifth flex_column_div  '     ><\/div><\/p>\n\n<style type=\"text\/css\" data-created_by=\"avia_inline_auto\" id=\"style-css-av-m6p5ovli-7a894d96fbb3f4cdebd645425ef2a0a3\">\n#top .hr.hr-invisible.av-m6p5ovli-7a894d96fbb3f4cdebd645425ef2a0a3{\nheight:50px;\n}\n<\/style>\n<div  class='hr av-m6p5ovli-7a894d96fbb3f4cdebd645425ef2a0a3 hr-invisible'><span class='hr-inner '><span class=\"hr-inner-style\"><\/span><\/span><\/div>\n<div  class='flex_column 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src=\"https:\/\/step-lab.com\/wp-content\/uploads\/2024\/04\/EA05-ST05-824x1030.png\" alt='' title='EA05 + ST05'  height=\"1030\" width=\"824\"  itemprop=\"thumbnailUrl\" srcset=\"https:\/\/step-lab.com\/wp-content\/uploads\/2024\/04\/EA05-ST05-824x1030.png 824w, https:\/\/step-lab.com\/wp-content\/uploads\/2024\/04\/EA05-ST05-240x300.png 240w, https:\/\/step-lab.com\/wp-content\/uploads\/2024\/04\/EA05-ST05-768x960.png 768w, https:\/\/step-lab.com\/wp-content\/uploads\/2024\/04\/EA05-ST05-1228x1536.png 1228w, https:\/\/step-lab.com\/wp-content\/uploads\/2024\/04\/EA05-ST05-1200x1500.png 1200w, https:\/\/step-lab.com\/wp-content\/uploads\/2024\/04\/EA05-ST05-564x705.png 564w, https:\/\/step-lab.com\/wp-content\/uploads\/2024\/04\/EA05-ST05.png 1546w\" sizes=\"(max-width: 824px) 100vw, 824px\" \/><\/div><\/div><\/div><\/div><div  class='flex_column av-6uufno6-ea50bcc3bd8e698d8c441ed06aeb9fa4 av_two_fifth flex_column_div  '     ><p>\n<style type=\"text\/css\" data-created_by=\"avia_inline_auto\" id=\"style-css-av-m9h3t164-97250059563561f606c357327a451f6f\">\n#top .hr.hr-invisible.av-m9h3t164-97250059563561f606c357327a451f6f{\nheight:100px;\n}\n<\/style>\n<div  class='hr av-m9h3t164-97250059563561f606c357327a451f6f hr-invisible'><span class='hr-inner '><span class=\"hr-inner-style\"><\/span><\/span><\/div><br \/>\n\n<style type=\"text\/css\" data-created_by=\"avia_inline_auto\" id=\"style-css-av-lpl48nw8-c74d84ee2063717f66c6450f13df416a\">\n#top .av_textblock_section.av-lpl48nw8-c74d84ee2063717f66c6450f13df416a .avia_textblock{\nfont-size:16px;\n}\n<\/style>\n<section  class='av_textblock_section av-lpl48nw8-c74d84ee2063717f66c6450f13df416a '   itemscope=\"itemscope\" itemtype=\"https:\/\/schema.org\/CreativeWork\" ><div class='avia_textblock'  itemprop=\"text\" ><h3><span class=\"ez-toc-section\" id=\"Machine_dessai_pour_ISO_178\"><\/span>Machine d&rsquo;essai pour ISO 178<br \/><span class=\"ez-toc-section-end\"><\/span><\/h3>\n<p>Pour les tests conformes \u00e0 la norme ISO 178, STEP Lab propose la <strong>s\u00e9rie EA<\/strong>, con\u00e7ue pour offrir une grande pr\u00e9cision, une fiabilit\u00e9 de mesure et une large gamme de capacit\u00e9s de force.<br \/> Ces machines d&rsquo;essai garantissent un contr\u00f4le pr\u00e9cis de la vitesse d&rsquo;essai et une conformit\u00e9 totale aux exigences r\u00e9glementaires.<\/p>\n<p><strong>Pour conna\u00eetre tous les d\u00e9tails de la s\u00e9rie EA, cliquez sur le bouton ci-dessous.<br \/><\/strong><\/p>\n<\/div><\/section><br \/>\n<div  class='avia-button-wrap av-lnx2w71h-c847a31c1299d18b7178300c6206a6b9-wrap avia-button-left '><a href='https:\/\/step-lab.com\/fr\/systemes-actionneurs-electromecaniques\/'  class='avia-button av-lnx2w71h-c847a31c1299d18b7178300c6206a6b9 av-link-btn avia-icon_select-no avia-size-small avia-position-left avia-color-theme-color'  target=\"_blank\"  rel=\"noopener noreferrer\"  aria-label=\"En savoir plus sur la s\u00e9rie EA&lt;br&gt;\"><span class='avia_iconbox_title' >En savoir plus sur la s\u00e9rie EA&lt;br&gt;<\/span><\/a><\/div><\/p><\/div><\/div><\/div><\/div><!-- close content main div --><\/div><\/div>\n<style type=\"text\/css\" data-created_by=\"avia_inline_auto\" id=\"style-css-av-6d38oly-65ed001af745ace1a1217d5fae3a597e\">\n.avia-section.av-6d38oly-65ed001af745ace1a1217d5fae3a597e{\nbackground-color:#dddddd;\nbackground-image:unset;\n}\n<\/style>\n<div id='av_section_4'  class='avia-section av-6d38oly-65ed001af745ace1a1217d5fae3a597e main_color avia-section-default avia-no-border-styling avia-bg-style-scroll container_wrap fullsize'  ><div class='container av-section-cont-open' ><div class='template-page content  av-content-full alpha units'><div class='post-entry post-entry-type-page post-entry-117302'><div class='entry-content-wrapper clearfix'>\n\n<style type=\"text\/css\" data-created_by=\"avia_inline_auto\" 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