{"id":4606,"date":"2026-08-12T14:47:10","date_gmt":"2026-08-12T12:47:10","guid":{"rendered":"https:\/\/ellistat.com\/?post_type=guide-dutilisateur&#038;p=4606"},"modified":"2026-08-12T14:47:10","modified_gmt":"2026-08-12T12:47:10","slug":"contrainte-resistance","status":"publish","type":"guide-dutilisateur","link":"https:\/\/ellistat.com\/it\/guide-dutilisateur\/contrainte-resistance\/","title":{"rendered":"Sollecitazione-resistenza"},"content":{"rendered":"<p class=\"wp-block-paragraph\">Un produit d\u00e9faille quand la&nbsp;<strong>contrainte<\/strong>&nbsp;qu&rsquo;il subit d\u00e9passe sa&nbsp;<strong>r\u00e9sistance<\/strong>. Les deux \u00e9tant dispers\u00e9es, la d\u00e9faillance est la probabilit\u00e9 de recouvrement des deux distributions.<\/p>\n\n\n\n<p class=\"wp-block-paragraph\">Cette page estime ce taux \u00e0 partir des deux lois. Elles peuvent \u00eatre d\u00e9finies par des\u00a0<strong>distributions th\u00e9oriques<\/strong>\u00a0ou par des\u00a0<strong>donn\u00e9es exp\u00e9rimentales<\/strong>. <\/p>\n\n\n\n<p class=\"wp-block-paragraph\">Par exemple on suppose un produit dont on a calcul\u00e9 la loi de d\u00e9faillance\u00a0: Weibull,\u00a0<strong>\u03b2<\/strong>(beta) = 1 et\u00a0<strong>\u03b7\u00a0<\/strong>(\u00eata) = 15000 cycles. On estime que l\u2019utilisateur le plus s\u00e9v\u00e8re utilisera le produit sur 30000 cycles, le moins s\u00e9v\u00e8re 200 et l\u2019utilisation moyenne entre 500 et 2000 que l\u2019on mod\u00e9lise par un trap\u00e8ze. On calcule alors le taux de d\u00e9faillance. Le taux de d\u00e9faillance estim\u00e9 est de 11%<\/p>\n\n\n\n<figure class=\"wp-block-image size-full\"><img loading=\"lazy\" decoding=\"async\" width=\"964\" height=\"490\" src=\"https:\/\/ellistat.com\/wp-content\/uploads\/fiabilite7.png\" alt=\"\" class=\"wp-image-4607\" srcset=\"https:\/\/ellistat.com\/wp-content\/uploads\/fiabilite7.png 964w, https:\/\/ellistat.com\/wp-content\/uploads\/fiabilite7-300x152.png 300w, https:\/\/ellistat.com\/wp-content\/uploads\/fiabilite7-768x390.png 768w, https:\/\/ellistat.com\/wp-content\/uploads\/fiabilite7-18x9.png 18w\" sizes=\"auto, (max-width: 964px) 100vw, 964px\" \/><\/figure>\n\n\n\n<blockquote class=\"wp-block-quote is-layout-flow wp-block-quote-is-layout-flow\">\n<p class=\"wp-block-paragraph\">\ud83d\udca1&nbsp;C&rsquo;est l&rsquo;outil du dimensionnement en conception, quand on n&rsquo;a pas encore de retours. Il montre aussi une chose contre-intuitive :&nbsp;<strong>c&rsquo;est la dispersion, plus que la moyenne, qui gouverne la d\u00e9faillance<\/strong>. Augmenter la r\u00e9sistance moyenne de 20 % aide moins que r\u00e9duire de moiti\u00e9 sa dispersion, car ce sont les queues de distribution qui se recouvrent.<\/p>\n\n\n\n<p class=\"wp-block-paragraph\">\u26a0\ufe0f Le r\u00e9sultat d\u00e9pend enti\u00e8rement des queues des deux lois, pr\u00e9cis\u00e9ment l\u00e0 o\u00f9 les donn\u00e9es sont les plus rares et o\u00f9 le choix de la loi a le plus d&rsquo;effet. Un taux calcul\u00e9 sur des hypoth\u00e8ses de loi non v\u00e9rifi\u00e9es est un ordre de grandeur, pas un chiffre.<\/p>\n<\/blockquote>\n\n\n\n<p class=\"wp-block-paragraph\"><\/p>","protected":false},"featured_media":0,"menu_order":40,"template":"","meta":{"_acf_changed":true},"menu-guide-dutilisateur":[36],"class_list":["post-4606","guide-dutilisateur","type-guide-dutilisateur","status-publish","hentry","menu-guide-dutilisateur-9-fiabilite"],"acf":[],"yoast_head":"<!-- This site is optimized with the Yoast SEO plugin v28.2 - https:\/\/yoast.com\/product\/yoast-seo-wordpress\/ -->\n<title>Contrainte-r\u00e9sistance - Ellistat<\/title>\n<meta name=\"description\" content=\"Estimez le taux de d\u00e9faillance d&#039;un produit en confrontant sa r\u00e9sistance \u00e0 la contrainte r\u00e9elle d&#039;usage, \u00e0 partir de lois th\u00e9oriques ou de donn\u00e9es terrain.\" \/>\n<meta name=\"robots\" content=\"index, follow, max-snippet:-1, max-image-preview:large, max-video-preview:-1\" \/>\n<link rel=\"canonical\" href=\"https:\/\/ellistat.com\/it\/guida-per-lutente\/contrainte-resistance\/\" \/>\n<meta property=\"og:locale\" content=\"it_IT\" \/>\n<meta property=\"og:type\" content=\"article\" \/>\n<meta property=\"og:title\" content=\"Contrainte-r\u00e9sistance - 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