{"id":8540,"date":"2021-04-30T18:54:53","date_gmt":"2021-04-30T18:54:53","guid":{"rendered":"https:\/\/polywaterv2.wpengine.com\/coefficient-de-friction-dans-le-tirage-de-cable-partie-2\/"},"modified":"2023-12-15T10:43:36","modified_gmt":"2023-12-15T16:43:36","slug":"coefficient-de-friction-dans-le-tirage-de-cable-partie-2","status":"publish","type":"post","link":"https:\/\/www.polywater.com\/fr\/knowledge-hub\/coefficient-de-friction-dans-le-tirage-de-cable-partie-2\/","title":{"rendered":"Coefficient de friction dans le tirage de c\u00e2ble\u00a0\u2013\u00a0Partie 2"},"content":{"rendered":"<div id=\"vyLightbox\"><\/div>\n<p>Le coefficient de friction (CDF) est une mesure de la r\u00e9sistance du frottement face au mouvement. Un article pr\u00e9c\u00e9dent a pr\u00e9sent\u00e9 la science derri\u00e8re le CDF et a discut\u00e9 des facteurs qui peuvent influencer cette valeur.<\/p>\n<p>La figure\u00a01 permet de clarifier et de d\u00e9finir plus formellement le \u00ab\u00a0coefficient de friction\u00a0\u00bb.<\/p>\n<p><img loading=\"lazy\" decoding=\"async\" class=\"alignnone size-full wp-image-21580\" src=\"https:\/\/www.polywater.com\/wp-content\/uploads\/2023\/05\/Figure-1-block-on-table-schematic.png\" alt=\"\" width=\"891\" height=\"296\" srcset=\"https:\/\/www.polywater.com\/wp-content\/uploads\/2023\/05\/Figure-1-block-on-table-schematic.png 891w, https:\/\/www.polywater.com\/wp-content\/uploads\/2023\/05\/Figure-1-block-on-table-schematic-300x100.png 300w, https:\/\/www.polywater.com\/wp-content\/uploads\/2023\/05\/Figure-1-block-on-table-schematic-768x255.png 768w\" sizes=\"auto, (max-width: 891px) 100vw, 891px\" \/><\/p>\n<p><strong>Figure 1<\/strong><\/p>\n<p>O\u00f9\u00a0:<\/p>\n<p>N (<em>Vecteur<\/em>)\u00a0 =\u00a0 Force normale perpendiculaire \u00e0 la table horizontale<\/p>\n<p>G (<em>Vecteur<\/em>)<em><sub>\u00a0<\/sub><\/em> = Force gravitationnelle sur un bloc de masse m.<\/p>\n<p>P (<em>Vecteur<\/em>) = Force de traction exerc\u00e9e sur le bloc pour le faire glisser horizontalement<\/p>\n<p>F (<em>Vecteur<\/em>) = Force de friction r\u00e9sistant au mouvement<\/p>\n<p>L&rsquo;exemple montre un bloc pos\u00e9 sur une table horizontale.\u00a0 Une force gravitationnelle G (<em>Vecteur<\/em>) (= mg) agit sur le bloc.\u00a0 Le bloc ne tombe pas car il existe une force \u00e9gale et oppos\u00e9e provenant de la table, que nous appelons la force normale. (N (<em>Vecteur<\/em>)).<\/p>\n<p>Si nous appliquons une autre force perpendiculaire (P (<em>Vecteur<\/em>)) \u00e0 la force normale, nous constatons qu&rsquo;une force minimale est n\u00e9cessaire pour que le bloc glisse. Cette force de traction doit surmonter la r\u00e9sistance au mouvement ou la force de friction (F (<em>Vecteur<\/em>)) pour que le bloc se d\u00e9place. \u00a0Le coefficient de friction est d\u00e9fini comme le rapport entre la force n\u00e9cessaire pour d\u00e9placer le bloc divis\u00e9e par la force normale (poids du bloc).<\/p>\n<p>Donc, si \u03bc est le coefficient de friction\u00a0:\u00a0 \u00a0\u03bc = P(<em>Vecteur<\/em>)\/F(<em>Vecteur<\/em>)\u00a0 \u00a0 (\u00c9quation 1)<\/p>\n<p>Pour illustrer, disons que le bloc est en bois (5\u00a0kg).\u00a0 Il faut une force de 2\u00a0kg pour faire glisser le bloc de bois sur une table horizontale en acier. Le CDF du bois sur l&rsquo;acier est le rapport entre la \u00ab\u00a0force de traction\u00a0\u00bb (2\u00a0kg) et la force normale (poids de 5\u00a0kg). \u00a0Donc le coefficient de friction est de\u00a00,4. \u00a0Notez que le CDF est un nombre sans dimension, puisqu&rsquo;il s&rsquo;agit du rapport entre la grandeur des deux forces.<\/p>\n<p>L&rsquo;exp\u00e9rience montre que si nous rempla\u00e7ons le bloc en bois par un bloc en caoutchouc de 5\u00a0kg, une force encore plus grande est n\u00e9cessaire pour produire un mouvement (disons une force de 6\u00a0kg). Ainsi, le CDF mesur\u00e9 du caoutchouc sur l&rsquo;acier serait de\u00a01,2.<\/p>\n<p>Il est important de noter, \u00e0 partir de ces exemples, que le CDF peut varier en fonction des mat\u00e9riaux qui sont utilis\u00e9s lors du frottement.<\/p>\n<table style=\"width: 100%; border: 3px solid #273A80; background-color: #69c3e8; margin: 15px 0px 15px 0px;\">\n<tbody>\n<tr>\n<td style=\"padding: 20px; text-align: center;\"><a href=\"https:\/\/www.polywater.com\/fr\/knowledge-hub\/coefficient-de-friction-dans-le-tirage-de-cable-partie-1\/\" target=\"_blank\" rel=\"noopener\"><strong>Contenus connexes : <\/strong>Coefficient de friction dans le tirage de c\u00e2ble \u2013 Partie 1<\/a><\/td>\n<\/tr>\n<\/tbody>\n<\/table>\n<h2><strong>\u00c9quations de tirage<\/strong><\/h2>\n<p>Remplacez le bloc par un c\u00e2ble et la table par un conduit, et nous obtenons le tirage de c\u00e2bles. L&rsquo;estimation de la tension dans le tirage de c\u00e2bles est bas\u00e9e sur la physique de l&rsquo;\u00e9quation\u00a01.\u00a0 La tension de tirage est d\u00e9termin\u00e9e par une s\u00e9rie d&rsquo;\u00e9quations de tirage de c\u00e2bles qui utilisent le poids et la friction comme donn\u00e9es d&rsquo;entr\u00e9e.<\/p>\n<p>Les \u00e9quations de tirage de c\u00e2ble en section de conduit droite ajoutent la tension d&rsquo;entr\u00e9e du d\u00e9vidoir ou de la section pr\u00e9c\u00e9dente du tirage. La formule de la section droite du conduit ressemble \u00e0 ceci\u00a0:<\/p>\n<p>Conduit droit\u00a0\u00a0\u00a0 \u00a0\u00a0 T<sub>de sortie<\/sub><span class=\"TextRun BCX9 SCXW86285286\" lang=\"FR-FR\" data-contrast=\"auto\"><span class=\"NormalTextRun ContextualSpellingAndGrammarErrorV2 BCX9 DefaultHighlightTransition GrammarErrorHighlight SCXW86285286\">\u00a0 =<\/span><\/span><span class=\"TextRun BCX9 SCXW86285286\" lang=\"FR-FR\" data-contrast=\"auto\"><span class=\"NormalTextRun BCX9 SCXW86285286\">\u00a0 T<sub>d&rsquo;entr\u00e9e<\/sub><\/span><\/span><span class=\"TextRun BCX9 SCXW86285286\" lang=\"FR-FR\" data-contrast=\"auto\"><span class=\"NormalTextRun BCX9 SCXW86285286\">\u00a0+ LW<\/span><\/span><span class=\"TextRun BCX9 SCXW86285286\" lang=\"EN-US\" data-contrast=\"auto\"><span class=\"NormalTextRun BCX9 SCXW86285286\">\u03bc<\/span><\/span> \u00a0 \u00a0 \u00a0 \u00a0 (\u00c9quation 2)<\/p>\n<p>O\u00f9\u00a0:<\/p>\n<p>T<sub>de sortie <\/sub>=\u00a0 Tension \u00e0 la sortie de la section droite<\/p>\n<p>T<sub>d&rsquo;entr\u00e9e\u00a0 <\/sub>=\u00a0\u00a0 Tension \u00e0 l&rsquo;entr\u00e9e de la section droite<\/p>\n<p>L\u00a0 =\u00a0\u00a0 Longueur du parcours droit<\/p>\n<p>W =\u00a0 \u00a0Poids du c\u00e2ble (par longueur)<\/p>\n<p>\u03bc\u00a0 =\u00a0 \u00a0Coefficient de friction<\/p>\n<p>Ainsi, le suppl\u00e9ment de friction est le poids total du c\u00e2ble multipli\u00e9 par le coefficient de friction.\u00a0 Pour utiliser cette formule afin d&rsquo;estimer la tension, nous devons conna\u00eetre les coefficients de friction pour les c\u00e2bles, les conduits et les lubrifiants typiques.<\/p>\n<table style=\"width: 100%; border: 3px solid #273A80; background-color: #69c3e8; margin: 15px 0px 15px 0px;\">\n<tbody>\n<tr>\n<td style=\"padding: 20px; text-align: center;\"><a href=\"https:\/\/www.polywater.com\/fr\/knowledge-hub\/coefficient-de-friction-dans-la-tension-des-tirages-de-cable-due-aux-courbures-des-conduits\/\" target=\"_blank\" rel=\"noopener\"><strong>Contenus connexes : <\/strong>Coefficient de friction dans la tension des tirages de c\u00e2ble due aux courbures des conduits<\/a><\/td>\n<\/tr>\n<\/tbody>\n<\/table>\n<h2><strong>Mesure du CDF des c\u00e2bles et des conduits<\/strong><\/h2>\n<p><img loading=\"lazy\" decoding=\"async\" class=\"alignnone size-full wp-image-17729\" src=\"https:\/\/www.polywater.com\/wp-content\/uploads\/2022\/09\/Friction-Table-Labeled-French-720p.png\" alt=\"Table de friction de Polywater\" width=\"720\" height=\"406\" srcset=\"https:\/\/www.polywater.com\/wp-content\/uploads\/2022\/09\/Friction-Table-Labeled-French-720p.png 720w, https:\/\/www.polywater.com\/wp-content\/uploads\/2022\/09\/Friction-Table-Labeled-French-720p-300x169.png 300w\" sizes=\"auto, (max-width: 720px) 100vw, 720px\" \/><\/p>\n<p>Pour mesurer le CDF entre une vari\u00e9t\u00e9 de mat\u00e9riaux de gaines de c\u00e2bles et de conduits, Polywater a d\u00e9velopp\u00e9 le tableau de friction montr\u00e9 dans la figure ci-dessus.\u00a0 L&rsquo;appareil exerce une pression vers le bas mesur\u00e9e sur un \u00e9chantillon de c\u00e2ble\/conduit, puis mesure la force n\u00e9cessaire pour tirer le c\u00e2ble perpendiculairement \u00e0 cette force normale.\u00a0 Le coefficient de friction, comme pr\u00e9c\u00e9demment, est le rapport de ces forces.<\/p>\n<p>Nous pouvons \u00e9galement lubrifier l&rsquo;interface c\u00e2ble et conduit et d\u00e9terminer l&rsquo;effet d&rsquo;un lubrifiant sur le coefficient de friction. \u00a0Les donn\u00e9es recueillies \u00e0 partir de milliers de tests effectu\u00e9s sur des dizaines d&rsquo;ann\u00e9es nous ont permis d&rsquo;optimiser la formulation et la s\u00e9lection des lubrifiants. Lorsque les fabricants de c\u00e2bles d\u00e9veloppent des gaines dot\u00e9es de nouvelles propri\u00e9t\u00e9s, telles que la r\u00e9sistance aux chocs ou au feu, nous pouvons mesurer et fournir des informations sur les propri\u00e9t\u00e9s de friction de ces nouveaux mat\u00e9riaux.<\/p>\n<table style=\"width: 100%; border: 3px solid #273A80; background-color: #69c3e8; margin: 15px 0px 15px 0px;\">\n<tbody>\n<tr>\n<td style=\"padding: 20px; text-align: center;\"><a href=\"https:\/\/www.polywater.com\/fr\/knowledge-hub\/tirage-de-cables-a-pearl-harbor-avec-la-hawaiian-electrical-company-heco\/\" target=\"_blank\" rel=\"noopener\"><strong>Contenus connexes : <\/strong>Tirage de c\u00e2bles \u00e0 Pearl Harbor avec la Hawaiian Electrical Company (HECO)<\/a><\/td>\n<\/tr>\n<\/tbody>\n<\/table>\n<h2><strong>L&rsquo;effet du lubrifiant<\/strong><\/h2>\n<p>Les mat\u00e9riaux des gaines de c\u00e2bles pr\u00e9sentent des diff\u00e9rences significatives en mati\u00e8re de comportement de friction, mais ils sont g\u00e9n\u00e9ralement d\u00e9velopp\u00e9s pour des raisons autres que la \u00ab\u00a0facilit\u00e9 de tirage\u00a0\u00bb. Si un lubrifiant de c\u00e2ble efficace peut r\u00e9duire les valeurs de friction sans avoir d&rsquo;impact sur les autres aspects de la performance de la gaine du c\u00e2ble, alors les probl\u00e8mes d&rsquo;installation peuvent \u00eatre minimis\u00e9s.<\/p>\n<p>Les donn\u00e9es montrent que c&rsquo;est exactement ce qui se passe.\u00a0 Les lubrifiants pour tirage efficaces r\u00e9duisent consid\u00e9rablement le coefficient de friction. La figure 2 montre la r\u00e9duction spectaculaire de la friction due \u00e0 l&rsquo;utilisation de lubrifiants.<\/p>\n<p><img loading=\"lazy\" decoding=\"async\" class=\"alignnone size-full wp-image-21554\" src=\"https:\/\/www.polywater.com\/wp-content\/uploads\/2023\/05\/Graphique-3-1.jpg\" alt=\"Un graphique montrant les effets d'une gaine de c\u00e2ble lorsqu'elle est lubrifi\u00e9e et non lubrifi\u00e9e.\" width=\"400\" height=\"248\" srcset=\"https:\/\/www.polywater.com\/wp-content\/uploads\/2023\/05\/Graphique-3-1.jpg 400w, https:\/\/www.polywater.com\/wp-content\/uploads\/2023\/05\/Graphique-3-1-300x186.jpg 300w\" sizes=\"auto, (max-width: 400px) 100vw, 400px\" \/><\/p>\n<table style=\"width: 100%; border: 3px solid #273A80; background-color: #69c3e8; margin: 15px 0px 15px 0px;\">\n<tbody>\n<tr>\n<td style=\"padding: 20px; text-align: center;\"><a href=\"https:\/\/www.polywater.com\/fr\/knowledge-hub\/faq-tirage-lubrification-et-tension-des-cables\/\" target=\"_blank\" rel=\"noopener\"><strong>Contenus connexes : <\/strong>FAQ \u2013 Tirage, lubrification et tension des c\u00e2bles<\/a><\/td>\n<\/tr>\n<\/tbody>\n<\/table>\n<h2><strong>Le tirage de c\u00e2bles est un peu plus compliqu\u00e9<\/strong><\/h2>\n<p>Le tableau de friction permet de tester la grande vari\u00e9t\u00e9 de mat\u00e9riaux utilis\u00e9s dans les c\u00e2bles et les conduits. Cependant, les v\u00e9ritables tirages de c\u00e2ble sont plus compliqu\u00e9s. \u00a0Les tirages ne sont pas rectilignes et des forces autres que le poids gravitationnel interviennent dans les sections de conduits courb\u00e9es.<\/p>\n<h2>Vous avez des questions ?<\/h2>\n<p><button class=\"button button--primary\" data-micromodal-trigger=\"polywater-modal--email-us-form\"> Envoyez-nous un e-mail <\/button><\/p>\n<div class=\"modal micromodal-slide\" id=\"polywater-modal--email-us-form\" aria-hidden=\"true\"><div class=\"modal__overlay\" tabindex=\"-1\" data-micromodal-close><div class=\"modal__container\" role=\"dialog\" aria-modal=\"true\" aria-labelledby=\"polywater-modal--email-us-form-title\"><header class=\"modal__header\"><h2 id=\"polywater-modal--email-us-form-title\">Envoyez-nous un e-mail <\/h2><button class=\"button--secondary modal__close\" aria-label=\"Close modal\" data-micromodal-close><\/button><\/header><div id=\"polywater-modal--email-us-form-content\"><!-- [if lte IE 8]>\r\n<script charset=\"utf-8\" type=\"text\/javascript\" src=\"\/\/js.hsforms.net\/forms\/v2-legacy.js\"><\/script>\r\n<![endif]-->\r\n<script charset=\"utf-8\" type=\"text\/javascript\" src=\"\/\/js.hsforms.net\/forms\/v2.js\"><\/script>\r\n<script>\r\nhbspt.forms.create({\r\n  region: \"na1\",\r\n  portalId: \"6060295\",\r\n  formId: \"58ee8ed3-55e9-421f-8604-464849d602fb\",\r\n  onFormReady: function (a) {\r\n    a.on('change', function(){\r\n      var zip = a.find('input[name=\"zip\"]');\r\n      if( zip ) {\r\n        if( zip.val() && zip.val().length > 4 ) {\r\n          var url = \"https:\/\/api.zippopotam.us\/us\/\" + zip.val();\r\n          var client = new XMLHttpRequest();\r\n          client.open(\"GET\", url, true);\r\n          client.onreadystatechange = function() {\r\n            if(client.readyState == 4) {\r\n              var resp = JSON.parse(client.responseText);\r\n              var city = resp.places[0]['place name'];\r\n              var state = resp.places[0]['state'];\r\n              a.find('input[name=\"city\"]').val(city);\r\n              a.find('input[name=\"state\"]').val(state);\r\n            };\r\n          };\r\n          client.send();\r\n        }\r\n      }\r\n    });\r\n  },\r\n});\r\n<\/script><\/div><\/div><\/div><\/div>","protected":false},"excerpt":{"rendered":"<p>Le coefficient de friction (CDF) est une mesure de la r\u00e9sistance du frottement face au mouvement. Un article pr\u00e9c\u00e9dent a&#8230;<\/p>\n","protected":false},"author":21,"featured_media":4091,"comment_status":"closed","ping_status":"closed","sticky":false,"template":"","format":"standard","meta":{"_acf_changed":false,"content-type":"","_relevanssi_hide_post":"","_relevanssi_hide_content":"","_relevanssi_pin_for_all":"","_relevanssi_pin_keywords":"","_relevanssi_unpin_keywords":"","_relevanssi_related_keywords":"","_relevanssi_related_include_ids":"","_relevanssi_related_exclude_ids":"","_relevanssi_related_no_append":"","_relevanssi_related_not_related":"","_relevanssi_related_posts":"","_relevanssi_noindex_reason":"","footnotes":""},"categories":[3059,3051,3053,3072,3069,3057,3061,3071],"tags":[1051,1084,3429],"industry-type":[2980,2981],"writer":[2944],"class_list":["post-8540","post","type-post","status-publish","format-standard","has-post-thumbnail","hentry","category-cablage-souterrain","category-installation-de-cable-dans-conduit","category-tirage-de-cables","category-soufflage-de-cable","category-mesure-de-friction","category-pull-planner","category-type-de-contenu","category-fiche-technique","tag-coefficient-de-friction","tag-mesure-de-friction","tag-coefficient-of-friction-fr","industry-type-telecommunications","industry-type-electrical-infrastructure","writer-john-fee-fr"],"acf":[],"yoast_head":"<!-- This site is optimized with the Yoast SEO plugin v28.6 - 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