Waiting three years to confirm a three-year lifespan is rarely acceptable. <\/p>\n\n\n\n
Accelerated testing subjects the product to a increased stress<\/strong> : temperature, voltage, load, humidity\u2026 and then extrapolate to normal conditions.<\/p>\n\n\n\n
Temperature: The Model of Chemical Degradation<\/td><\/tr>
Eyring<\/strong><\/td>
Temperature, with a second factor<\/td><\/tr>
Inverse-Power Law<\/strong><\/td>
Stress, mechanical load, pressure<\/td><\/tr>
Peck<\/strong><\/td>
Combined Temperature and Humidity<\/td><\/tr>
Coffin-Manson<\/strong><\/td>
Thermal cycling, fatigue<\/td><\/tr>
Basquin<\/strong><\/td>
Mechanical Fatigue Under Stress Amplitude<\/td><\/tr><\/tbody><\/table><\/figure>\n\n\n\n
Enter the model type<\/strong>, the one(s) constraint variables<\/strong>. There is a button that allows you to\u2019Add a second constraint<\/strong>, the column of the failure values<\/strong> and the censorships<\/strong>. Arrhenius asks for a activation energy<\/strong>.<\/p>\n\n\n\n<\/figure>\n\n\n\n
The results show the\u2019equation<\/strong> of the fitted model, its R2<\/strong>, the graph Lifespan vs. Stress (log-log)<\/strong> and the acceleration factor<\/strong>.<\/p>\n\n\n\n
\n
\ud83d\udca1 The log-log graph is used to check validity: the constraint levels should align. A point that deviates indicates that this level changed the failure mechanism<\/strong> Above a certain temperature, the degradation is no longer the same. This level must be excluded from the extrapolation.<\/p>\n<\/blockquote>\n\n\n\n
\n
\u26a0\ufe0f This is the main risk of the method: Accelerating too hard triggers another failure mode.<\/strong>, and we then extrapolate a law that does not accurately describe the product\u2019s actual behavior. Stay within a range where the mechanism remains the same, and be wary of very high acceleration factors.<\/p>\n<\/blockquote>\n\n\n\n
\n
\ud83d\udca1 Plan ahead at least three levels of constraint<\/strong>. With two points, we draw a line through them: there is no way to verify that it is a straight line.<\/p>\n<\/blockquote>","protected":false},"featured_media":0,"menu_order":80,"template":"","meta":{"_acf_changed":true},"menu-guide-dutilisateur":[36],"class_list":["post-4615","guide-dutilisateur","type-guide-dutilisateur","status-publish","hentry","menu-guide-dutilisateur-9-fiabilite"],"acf":[],"yoast_head":"\nEssais acc\u00e9l\u00e9r\u00e9s - Ellistat<\/title>\n<meta name=\"description\" content=\"Arrhenius, Eyring, Peck, Coffin-Manson : choisissez le bon mod\u00e8le d'essai acc\u00e9l\u00e9r\u00e9 pour extrapoler la dur\u00e9e de vie de vos produits sans attendre des ann\u00e9es.\" \/>\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\/en\/users-guide\/accelerated-testing\/\" \/>\n<meta property=\"og:locale\" content=\"en_US\" \/>\n<meta property=\"og:type\" content=\"article\" \/>\n<meta property=\"og:title\" content=\"Essais acc\u00e9l\u00e9r\u00e9s - 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