{"id":374213,"date":"2024-07-30T13:33:24","date_gmt":"2024-07-30T13:33:24","guid":{"rendered":"https:\/\/innovationspace.ansys.com\/forum\/forums\/reply\/374213\/"},"modified":"2024-07-30T13:33:24","modified_gmt":"2024-07-30T13:33:24","slug":"374213","status":"publish","type":"reply","link":"https:\/\/innovationspace.ansys.com\/forum\/forums\/reply\/374213\/","title":{"rendered":"Reply To: Fatigue Results in nCode"},"content":{"rendered":"<p>&lt;p&gt;Not necssarily.&nbsp; It depends on the SN curve.&nbsp; DesignLife does not use the yield stress in SN fatigue.&nbsp; It uses the calculated alternating stress and the SN curve to predict the fatigue damage\/life.&nbsp; See the SN curve below for basic structural steel from Engineering Data.&nbsp; Its YS is 250 MPa, which correlates to a N of about 12,000 cycles.&nbsp; So, an alternating stress slightly greater than 250 MPa will predict more than 10,000 allowable cycles.&nbsp; For other materials, the spread maybe larger. &nbsp;What is the N value on your SN curve for 480 MPa?&lt;\/p&gt;&lt;p&gt;<img decoding=\"async\" src=\"https:\/\/innovationspace.ansys.com\/forum\/wp-content\/uploads\/sites\/2\/2024\/07\/30-07-2024-1722346089-mceclip1.png\" \/>&lt;\/p&gt;<\/p>\n","protected":false},"template":"","class_list":["post-374213","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=\"Not necssarily. It depends on the SN curve. DesignLife does not use the yield stress in SN fatigue. It uses the calculated alternating stress and the SN curve to predict the fatigue damage\/life. See the SN curve below for basic structural steel from Engineering Data. Its YS is 250 MPa, which correlates to a N\" \/>\n\t<meta name=\"robots\" content=\"max-image-preview:large\" \/>\n\t<link rel=\"canonical\" href=\"https:\/\/innovationspace.ansys.com\/forum\/forums\/reply\/374213\/\" \/>\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=\"Not necssarily. It depends on the SN curve. DesignLife does not use the yield stress in SN fatigue. It uses the calculated alternating stress and the SN curve to predict the fatigue damage\/life. See the SN curve below for basic structural steel from Engineering Data. Its YS is 250 MPa, which correlates to a N\" \/>\n\t\t<meta property=\"og:url\" content=\"https:\/\/innovationspace.ansys.com\/forum\/forums\/reply\/374213\/\" \/>\n\t\t<meta property=\"og:image\" content=\"https:\/\/innovationspace.ansys.com\/forum\/wp-content\/uploads\/sites\/2\/2024\/07\/30-07-2024-1722346089-mceclip1.png\" \/>\n\t\t<meta property=\"og:image:secure_url\" content=\"https:\/\/innovationspace.ansys.com\/forum\/wp-content\/uploads\/sites\/2\/2024\/07\/30-07-2024-1722346089-mceclip1.png\" \/>\n\t\t<meta property=\"article:published_time\" content=\"2024-07-30T13:33:24+00:00\" \/>\n\t\t<meta property=\"article:modified_time\" content=\"2024-07-30T13:33:24+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=\"Not necssarily. It depends on the SN curve. DesignLife does not use the yield stress in SN fatigue. It uses the calculated alternating stress and the SN curve to predict the fatigue damage\/life. See the SN curve below for basic structural steel from Engineering Data. Its YS is 250 MPa, which correlates to a N\" \/>\n\t\t<meta name=\"twitter:image\" content=\"https:\/\/innovationspace.ansys.com\/forum\/wp-content\/uploads\/sites\/2\/2024\/07\/30-07-2024-1722346089-mceclip1.png\" \/>\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\\\/374213\\\/#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\\\/374213\\\/#listItem\",\"name\":\"Reply To: Fatigue Results in nCode\"}},{\"@type\":\"ListItem\",\"@id\":\"https:\\\/\\\/innovationspace.ansys.com\\\/forum\\\/forums\\\/reply\\\/374213\\\/#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\\\/374213\\\/#webpage\",\"url\":\"https:\\\/\\\/innovationspace.ansys.com\\\/forum\\\/forums\\\/reply\\\/374213\\\/\",\"name\":\"Reply To: Fatigue Results in nCode | Ansys Learning Forum\",\"description\":\"Not necssarily. It depends on the SN curve. DesignLife does not use the yield stress in SN fatigue. It uses the calculated alternating stress and the SN curve to predict the fatigue damage\\\/life. See the SN curve below for basic structural steel from Engineering Data. Its YS is 250 MPa, which correlates to a N\",\"inLanguage\":\"en-US\",\"isPartOf\":{\"@id\":\"https:\\\/\\\/innovationspace.ansys.com\\\/forum\\\/#website\"},\"breadcrumb\":{\"@id\":\"https:\\\/\\\/innovationspace.ansys.com\\\/forum\\\/forums\\\/reply\\\/374213\\\/#breadcrumblist\"},\"datePublished\":\"2024-07-30T13:33:24+00:00\",\"dateModified\":\"2024-07-30T13:33:24+00:00\"},{\"@type\":\"WebSite\",\"@id\":\"https:\\\/\\\/innovationspace.ansys.com\\\/forum\\\/#website\",\"url\":\"https:\\\/\\\/innovationspace.ansys.com\\\/forum\\\/\",\"name\":\"Ansys Learning Forum\",\"description\":\"Ansys Innovation Space\",\"inLanguage\":\"en-US\",\"publisher\":{\"@id\":\"https:\\\/\\\/innovationspace.ansys.com\\\/forum\\\/#organization\"}}]}\n\t\t<\/script>\n\t\t<!-- All in One SEO -->\n\n","aioseo_head_json":{"title":"Reply To: Fatigue Results in nCode | Ansys Learning Forum","description":"Not necssarily. It depends on the SN curve. DesignLife does not use the yield stress in SN fatigue. It uses the calculated alternating stress and the SN curve to predict the fatigue damage\/life. See the SN curve below for basic structural steel from Engineering Data. Its YS is 250 MPa, which correlates to a N","canonical_url":"https:\/\/innovationspace.ansys.com\/forum\/forums\/reply\/374213\/","robots":"max-image-preview:large","keywords":"","webmasterTools":{"miscellaneous":""},"schema":{"@context":"https:\/\/schema.org","@graph":[{"@type":"BreadcrumbList","@id":"https:\/\/innovationspace.ansys.com\/forum\/forums\/reply\/374213\/#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\/374213\/#listItem","name":"Reply To: Fatigue Results in nCode"}},{"@type":"ListItem","@id":"https:\/\/innovationspace.ansys.com\/forum\/forums\/reply\/374213\/#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\/374213\/#webpage","url":"https:\/\/innovationspace.ansys.com\/forum\/forums\/reply\/374213\/","name":"Reply To: Fatigue Results in nCode | Ansys Learning Forum","description":"Not necssarily. It depends on the SN curve. DesignLife does not use the yield stress in SN fatigue. It uses the calculated alternating stress and the SN curve to predict the fatigue damage\/life. See the SN curve below for basic structural steel from Engineering Data. Its YS is 250 MPa, which correlates to a N","inLanguage":"en-US","isPartOf":{"@id":"https:\/\/innovationspace.ansys.com\/forum\/#website"},"breadcrumb":{"@id":"https:\/\/innovationspace.ansys.com\/forum\/forums\/reply\/374213\/#breadcrumblist"},"datePublished":"2024-07-30T13:33:24+00:00","dateModified":"2024-07-30T13:33:24+00:00"},{"@type":"WebSite","@id":"https:\/\/innovationspace.ansys.com\/forum\/#website","url":"https:\/\/innovationspace.ansys.com\/forum\/","name":"Ansys Learning Forum","description":"Ansys Innovation Space","inLanguage":"en-US","publisher":{"@id":"https:\/\/innovationspace.ansys.com\/forum\/#organization"}}]},"og:locale":"en_US","og:site_name":"Ansys Learning Forum | Ansys Innovation Space","og:type":"article","og:title":"Reply To: Fatigue Results in nCode | Ansys Learning Forum","og:description":"Not necssarily. It depends on the SN curve. DesignLife does not use the yield stress in SN fatigue. It uses the calculated alternating stress and the SN curve to predict the fatigue damage\/life. See the SN curve below for basic structural steel from Engineering Data. Its YS is 250 MPa, which correlates to a N","og:url":"https:\/\/innovationspace.ansys.com\/forum\/forums\/reply\/374213\/","og:image":"https:\/\/innovationspace.ansys.com\/forum\/wp-content\/uploads\/sites\/2\/2024\/07\/30-07-2024-1722346089-mceclip1.png","og:image:secure_url":"https:\/\/innovationspace.ansys.com\/forum\/wp-content\/uploads\/sites\/2\/2024\/07\/30-07-2024-1722346089-mceclip1.png","article:published_time":"2024-07-30T13:33:24+00:00","article:modified_time":"2024-07-30T13:33:24+00:00","twitter:card":"summary_large_image","twitter:title":"Reply To: Fatigue Results in nCode | Ansys Learning Forum","twitter:description":"Not necssarily. It depends on the SN curve. DesignLife does not use the yield stress in SN fatigue. 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