{"id":373792,"date":"2024-07-26T13:34:21","date_gmt":"2024-07-26T13:34:21","guid":{"rendered":"https:\/\/innovationspace.ansys.com\/forum\/forums\/reply\/373792\/"},"modified":"2024-07-26T13:34:21","modified_gmt":"2024-07-26T13:34:21","slug":"373792","status":"publish","type":"reply","link":"https:\/\/innovationspace.ansys.com\/forum\/forums\/reply\/373792\/","title":{"rendered":"Reply To: Fatigue Results in nCode"},"content":{"rendered":"<p>&lt;p&gt;By limit, do you mean the cycle value at the transition between high cycle fatigue (HCF) and low cycle fatigue (LCF) where the stresslife method (SN) becomes invalid?&nbsp; If so, then there is no precise cycle limit.&nbsp; In theory SN is only valid for stresses below yield which results equates to a allowable cycles of about 10^3 for many ductile metals.&nbsp; So as a &#8220;rule of thumb&#8221;, 10^3 is often considered to be the transition from HCF to LCF.&nbsp; However, the true value varies based on the material and some SN curves extend below yield, so SN is often used even if the stress is slightly above yield.&lt;\/p&gt;<\/p>\n","protected":false},"template":"","class_list":["post-373792","reply","type-reply","status-publish","hentry"],"aioseo_notices":[],"aioseo_head":"\n\t\t<!-- All in One SEO 4.9.10 - aioseo.com -->\n\t<meta name=\"description\" content=\"By limit, do you mean the cycle value at the transition between high cycle fatigue (HCF) and low cycle fatigue (LCF) where the stresslife method (SN) becomes invalid? If so, then there is no precise cycle limit. In theory SN is only valid for stresses below yield which results equates to a allowable cycles of\" \/>\n\t<meta name=\"robots\" content=\"max-image-preview:large\" \/>\n\t<link rel=\"canonical\" href=\"https:\/\/innovationspace.ansys.com\/forum\/forums\/reply\/373792\/\" \/>\n\t<meta name=\"generator\" content=\"All in One SEO (AIOSEO) 4.9.10\" \/>\n\t\t<meta property=\"og:locale\" content=\"en_US\" \/>\n\t\t<meta property=\"og:site_name\" content=\"Ansys Learning Forum | Ansys Innovation Space\" \/>\n\t\t<meta property=\"og:type\" content=\"article\" \/>\n\t\t<meta property=\"og:title\" content=\"Reply To: Fatigue Results in nCode | Ansys Learning Forum\" \/>\n\t\t<meta property=\"og:description\" content=\"By limit, do you mean the cycle value at the transition between high cycle fatigue (HCF) and low cycle fatigue (LCF) where the stresslife method (SN) becomes invalid? If so, then there is no precise cycle limit. In theory SN is only valid for stresses below yield which results equates to a allowable cycles of\" \/>\n\t\t<meta property=\"og:url\" content=\"https:\/\/innovationspace.ansys.com\/forum\/forums\/reply\/373792\/\" \/>\n\t\t<meta property=\"article:published_time\" content=\"2024-07-26T13:34:21+00:00\" \/>\n\t\t<meta property=\"article:modified_time\" content=\"2024-07-26T13:34:21+00:00\" \/>\n\t\t<meta name=\"twitter:card\" content=\"summary_large_image\" \/>\n\t\t<meta name=\"twitter:title\" content=\"Reply To: Fatigue Results in nCode | Ansys Learning Forum\" \/>\n\t\t<meta name=\"twitter:description\" content=\"By limit, do you mean the cycle value at the transition between high cycle fatigue (HCF) and low cycle fatigue (LCF) where the stresslife method (SN) becomes invalid? If so, then there is no precise cycle limit. In theory SN is only valid for stresses below yield which results equates to a allowable cycles of\" \/>\n\t\t<script type=\"application\/ld+json\" class=\"aioseo-schema\">\n\t\t\t{\"@context\":\"https:\\\/\\\/schema.org\",\"@graph\":[{\"@type\":\"BreadcrumbList\",\"@id\":\"https:\\\/\\\/innovationspace.ansys.com\\\/forum\\\/forums\\\/reply\\\/373792\\\/#breadcrumblist\",\"itemListElement\":[{\"@type\":\"ListItem\",\"@id\":\"https:\\\/\\\/innovationspace.ansys.com\\\/forum#listItem\",\"position\":1,\"name\":\"Home\",\"item\":\"https:\\\/\\\/innovationspace.ansys.com\\\/forum\",\"nextItem\":{\"@type\":\"ListItem\",\"@id\":\"https:\\\/\\\/innovationspace.ansys.com\\\/forum\\\/forums\\\/reply\\\/373792\\\/#listItem\",\"name\":\"Reply To: Fatigue Results in nCode\"}},{\"@type\":\"ListItem\",\"@id\":\"https:\\\/\\\/innovationspace.ansys.com\\\/forum\\\/forums\\\/reply\\\/373792\\\/#listItem\",\"position\":2,\"name\":\"Reply To: Fatigue Results in nCode\",\"previousItem\":{\"@type\":\"ListItem\",\"@id\":\"https:\\\/\\\/innovationspace.ansys.com\\\/forum#listItem\",\"name\":\"Home\"}}]},{\"@type\":\"Organization\",\"@id\":\"https:\\\/\\\/innovationspace.ansys.com\\\/forum\\\/#organization\",\"name\":\"Ansys Learning Forum\",\"description\":\"Ansys Innovation Space\",\"url\":\"https:\\\/\\\/innovationspace.ansys.com\\\/forum\\\/\"},{\"@type\":\"WebPage\",\"@id\":\"https:\\\/\\\/innovationspace.ansys.com\\\/forum\\\/forums\\\/reply\\\/373792\\\/#webpage\",\"url\":\"https:\\\/\\\/innovationspace.ansys.com\\\/forum\\\/forums\\\/reply\\\/373792\\\/\",\"name\":\"Reply To: Fatigue Results in nCode | Ansys Learning Forum\",\"description\":\"By limit, do you mean the cycle value at the transition between high cycle fatigue (HCF) and low cycle fatigue (LCF) where the stresslife method (SN) becomes invalid? 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