{"id":363248,"date":"2024-04-19T16:52:00","date_gmt":"2024-04-19T16:52:00","guid":{"rendered":"\/forum\/forums\/reply\/363248\/"},"modified":"2024-04-19T16:52:00","modified_gmt":"2024-04-19T16:52:00","slug":"363248","status":"publish","type":"reply","link":"https:\/\/innovationspace.ansys.com\/forum\/forums\/reply\/363248\/","title":{"rendered":"Reply To: Nonlinear Fatigue Analysis"},"content":{"rendered":"<p>&lt;p&gt;I do not know why your time step loading model is not producing valid results.&nbsp;&lt;\/p&gt;&lt;p&gt;You can use the time series load provider in an EN analysis even if the &lt;span style=&#8221;text-decoration: underline;&#8221;&gt;elastically calculated stresses&lt;\/span&gt; exceed yield.&nbsp; The time series load provider will use linear superpositon which is valid if the stresses are elastically calculated.&nbsp; The EN engine will use an elastic-plastic correction (Hoffman-Seeger or Neuber) on the final stresses to calculate the plastic strains to be used in the fatigue evaluation.&lt;\/p&gt;&lt;p&gt;You cannot use the time series load provider if plastic strains were calculated in the FE.&nbsp; Linear superposition is not valid for nonlinear stress results.&lt;\/p&gt;<\/p>\n","protected":false},"template":"","class_list":["post-363248","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=\"I do not know why your time step loading model is not producing valid results. You can use the time series load provider in an EN analysis even if the elastically calculated stresses exceed yield. The time series load provider will use linear superpositon which is valid if the stresses are elastically calculated. The\" \/>\n\t<meta name=\"robots\" content=\"max-image-preview:large\" \/>\n\t<link rel=\"canonical\" href=\"https:\/\/innovationspace.ansys.com\/forum\/forums\/reply\/363248\/\" \/>\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: Nonlinear Fatigue Analysis | Ansys Learning Forum\" \/>\n\t\t<meta property=\"og:description\" content=\"I do not know why your time step loading model is not producing valid results. You can use the time series load provider in an EN analysis even if the elastically calculated stresses exceed yield. The time series load provider will use linear superpositon which is valid if the stresses are elastically calculated. The\" \/>\n\t\t<meta property=\"og:url\" content=\"https:\/\/innovationspace.ansys.com\/forum\/forums\/reply\/363248\/\" \/>\n\t\t<meta property=\"article:published_time\" content=\"2024-04-19T16:52:00+00:00\" \/>\n\t\t<meta property=\"article:modified_time\" content=\"2024-04-19T16:52:00+00:00\" \/>\n\t\t<meta name=\"twitter:card\" content=\"summary_large_image\" \/>\n\t\t<meta name=\"twitter:title\" content=\"Reply To: Nonlinear Fatigue Analysis | Ansys Learning Forum\" \/>\n\t\t<meta name=\"twitter:description\" content=\"I do not know why your time step loading model is not producing valid results. You can use the time series load provider in an EN analysis even if the elastically calculated stresses exceed yield. 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