{"id":5431,"date":"2012-06-20T16:43:59","date_gmt":"2012-06-20T16:43:59","guid":{"rendered":"https:\/\/www.unirope.com\/?p=5431"},"modified":"2021-05-13T18:24:23","modified_gmt":"2021-05-13T18:24:23","slug":"duree-de-vie-relative-en-service-perte-de-resistance-pourquoi-des-cables-multi-torons","status":"publish","type":"post","link":"https:\/\/www.unirope.com\/fr\/duree-de-vie-relative-en-service-perte-de-resistance-pourquoi-des-cables-multi-torons\/","title":{"rendered":"Dur\u00e9e de vie relative en service, Perte de r\u00e9sistance, Pourquoi des c\u00e2bles multi-torons"},"content":{"rendered":"<table class=\"generic-table3\" style=\"width: 100%;border-bottom:0;\" border=\"0\" cellspacing=\"0\" cellpadding=\"0\">\n<tbody>\n<tr>\n<td colspan=\"2\" width=\"60%\">\n<img loading=\"lazy\" src=\"\/wp-content\/uploads\/2015\/11\/pg22-img01-fr-2.gif\" alt=\"\" width=\"350\" height=\"261\" class=\"alignnone size-full wp-image-14323\" \/>\n<\/td>\n<td width=\"40%\">\n<h2>Courbure et r\u00e9sistance \u00e0 la fatigue<\/h2>\n<p>La capacit\u00e9 d\u2019un c\u00e2ble d\u2019acier de supporter des r\u00e9p\u00e9titions de courbure sur les poulies et sur les tambours est appel\u00e9e \u201cr\u00e9sistance \u00e0 la fatigue\u201d. Ce terme d\u00e9crit l\u2019ultime dur\u00e9e de vie d\u2019un c\u00e2ble bas\u00e9e sur la r\u00e9sistance m\u00e9canique a la fatigue maximale. Ce terme ne d\u00e9crit PAS la capacit\u00e9 du c\u00e2ble de supporter des dommages m\u00e9caniques ou la r\u00e9sistance au facteur d\u2019ecrasement du c\u00e2ble.<\/p>\n<p>La r\u00e9sistance \u00e0 la fatigue d\u2019un c\u00e2ble ne d\u00e9pend pas de la dur\u00e9e de travail mais bien du cycle de travail. La fatigue due \u00e0 la courbure est la capacit\u00e9 de supporter une courbe r\u00e9p\u00e9titive sur les poulies et les tambours et cette capacit\u00e9 est reli\u00e9e aux factures d\u2019\u00e9quipements suivants: le diam\u00e8tre, la forme, et les dimensions des gorges des poulies et des tambours : la charge \u00e0 laquelle le c\u00e2ble est assujetti : la vitesse de ligne : une acc\u00e9l\u00e9ration rapide et les forces de freinage: la construction du c\u00e2ble.<\/p>\n<p>Plus le rayon de courbure s\u2019accro\u00eet plus on peut s\u2019attendre une longueur de vie accrue. De grands tambours et de grandes poulies vont r\u00e9duire les pressions radiales du c\u00e2ble. Les courbures a sens inverse dans le syst\u00e8me d\u2019enroulement, particuli\u00e8rement dans de courtes distances auront un impact n\u00e9gatif sur la vie du c\u00e2ble.<\/p>\n<\/td>\n<\/tr><tr>\n<td width=\"30%\">\n<p><img loading=\"lazy\" class=\"alignnone size-full wp-image-2650\" title=\"pg22-img02\" src=\"\/wp-content\/themes\/unirope\/img\/pg22-img02.gif\" alt=\"\" width=\"175\" height=\"190\" \/><br \/><small style=\"display: block; float: left;\">Si la chaine ou l&rsquo;objet represente 2 fois le diam\u00e8tre d&rsquo;une elingue de c\u00e2ble d&rsquo;acier a 6 torons (D\/d 2:1) la capacite de l&rsquo;elingue doit \u00eatre reduite par 40 %.<\/small><\/p>\n<p><img loading=\"lazy\" class=\"alignnone size-full wp-image-2652\" title=\"pg22-img04\" src=\"\/wp-content\/themes\/unirope\/img\/pg22-img04.gif\" alt=\"\" width=\"175\" height=\"190\" \/><br \/> <small style=\"display: block; float: left;\">Si l&rsquo;objet soulev\u00e9 avec une \u00e9lingue de c\u00e2ble a au moins 25 fois le diametre du c\u00e2ble (D\/d 25:1) aucun besoin d&rsquo;adjuster la capacit\u00e9 de l&rsquo;elingue en panier.<\/small><\/p>\n<\/td>\n<td width=\"30%\">\n<img loading=\"lazy\" src=\"\/wp-content\/uploads\/2012\/06\/pg22-img03-fr.gif\" alt=\"\" width=\"175\" height=\"239\" class=\"alignnone size-full wp-image-14330\" \/>\n<\/td>\n<td width=\"40%\">\n<h2>Perte de r\u00e9sistance sur poulies ou axes<\/h2>\n<p>La force de rupture d\u2019un c\u00e2ble est d\u00e9termin\u00e9e au moyen d\u2019un test standard. Par le montage d\u2019accessoires \u00e0 l\u2019extr\u00e9mit\u00e9 du c\u00e2ble , et par une traction lin\u00e9aire du c\u00e2ble. Toutefois lorsque le c\u00e2ble chemine sur une surface courb\u00e9e ( comme une poulie ou un axe) sa r\u00e9sistance en sera diminu\u00e9e. L\u2019importance de cette diminution d\u00e9pendra de la s\u00e9v\u00e9rit\u00e9 de la courbure tel que d\u00e9crit par le ratio D\/d.<\/p>\n<p>Par exemple, un c\u00e2ble courbe autour d\u2019un axe de diam\u00e8tre identique a son propre diam\u00e8tre n\u2019atteindra que 50 % de sa force telle qu\u2019indiqu\u00e9e pendant le test standard. C\u2019est ce qu\u2019on appelle \u00ab\u00a0efficacit\u00e9 de 50 %\u00a0\u00bb. M\u00eame si on consid\u00e8re un ratio D\/d de 40, il y aura une perte allant jusqu\u2019\u00e0 5 %.<\/p>\n<p>Lorsque les ratios D\/d diminuent, la perte de r\u00e9sistance s\u2019accro\u00eet rapidement. L\u2019angle de courbure ne doit pas \u00eatre de 180\u00b0, de 90\u00b0 ou m\u00eame de 45\u00b0; des angles de courbure relativement faibles peuvent entra\u00eener des pertes consid\u00e9rables.<\/p>\n<p>Le tableau pr\u00e9sent\u00e9 est \u00e9labor\u00e9 a partir de donn\u00e9es de test standard telles que publi\u00e9es par le \u00ab\u00a0Wire Rope Technical Board\u00a0\u00bb, est base seulement et est une moyenne pond\u00e9r\u00e9e de 458 tests avec axes et cosses pour des c\u00e2bles de classe 6&#215;19 et 6&#215;37.<\/p>\n<\/td>\n<\/tr>\n<tr>\n<td colspan=\"2\" width=\"60%\">\n<img loading=\"lazy\" class=\"alignnone size-full wp-image-2770\" title=\"bending_fatigue_2\" src=\"\/wp-content\/themes\/unirope\/img\/bending_fatigue_2.gif\" alt=\"\" width=\"350\" height=\"409\" \/>\n<\/td>\n<td width=\"40%\">\n<h2>Pourquoi des c\u00e2bles multi-toron ?<\/h2>\n<p>Le nombre de torons ext\u00e9rieurs d\u00e9termine la surface de contact entre le c\u00e2ble et la gorge de poulie. Plus la surface de contact est grande plus les points de contact sont multipli\u00e9s et les pressions de contact sont r\u00e9duites.<\/p>\n<p>De m\u00eame les encoches lat\u00e9rales entre les torons et les fils sont r\u00e9duites, ayant pour r\u00e9sultat une dur\u00e9e de vie prolong\u00e9e.<\/p>\n<p>De nombreux programmes de tests \u00e0 l\u2019universit\u00e9 de Stuttgart en Allemagne ont prouv\u00e9 de fa\u00e7on concluante que la fatigue relative \u00e0 la courbure d\u2019un c\u00e2ble d\u2019acier est am\u00e9lior\u00e9e avec un nombre accru de torons ext\u00e9rieurs.<\/p>\n<p>Sur la base de cette recherche nous avons d\u00e9velopp\u00e9 le c\u00e2ble Python&reg; \u00e0 haute performance, le c\u00e2ble d\u2019acier \u00e0 8-, 9- et 10 torons ext\u00e9rieurs.<\/p>\n<\/td>\n<\/tr>\n<tr><\/tr>\n<\/tbody>\n<\/table>\n","protected":false},"excerpt":{"rendered":"<p>Courbure et r\u00e9sistance \u00e0 la fatigue La capacit\u00e9 d\u2019un c\u00e2ble d\u2019acier de supporter des r\u00e9p\u00e9titions de courbure sur les poulies et sur les tambours est appel\u00e9e \u201cr\u00e9sistance \u00e0 la fatigue\u201d. Ce terme d\u00e9crit l\u2019ultime dur\u00e9e de vie d\u2019un c\u00e2ble bas\u00e9e sur la r\u00e9sistance m\u00e9canique a la fatigue maximale. Ce terme ne d\u00e9crit PAS la capacit\u00e9 [&hellip;]<\/p>\n","protected":false},"author":1,"featured_media":0,"comment_status":"open","ping_status":"open","sticky":false,"template":"","format":"standard","meta":[],"categories":[139],"tags":[],"yoast_head":"<!-- This site is optimized with the Yoast SEO plugin v18.1 - https:\/\/yoast.com\/wordpress\/plugins\/seo\/ -->\n<meta name=\"robots\" content=\"index, follow, max-snippet:-1, max-image-preview:large, max-video-preview:-1\" \/>\n<link rel=\"canonical\" href=\"https:\/\/www.unirope.com\/fr\/duree-de-vie-relative-en-service-perte-de-resistance-pourquoi-des-cables-multi-torons\/\" \/>\n<meta property=\"og:locale\" content=\"fr_FR\" \/>\n<meta property=\"og:type\" content=\"article\" \/>\n<meta property=\"og:title\" content=\"Dur\u00e9e de vie relative en service, Perte de r\u00e9sistance, Pourquoi des c\u00e2bles multi-torons - Unirope Ltd.\" \/>\n<meta property=\"og:description\" content=\"Courbure et r\u00e9sistance \u00e0 la fatigue La capacit\u00e9 d\u2019un c\u00e2ble d\u2019acier de supporter des r\u00e9p\u00e9titions de courbure sur les poulies et sur les tambours est appel\u00e9e \u201cr\u00e9sistance \u00e0 la fatigue\u201d. Ce terme d\u00e9crit l\u2019ultime dur\u00e9e de vie d\u2019un c\u00e2ble bas\u00e9e sur la r\u00e9sistance m\u00e9canique a la fatigue maximale. 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