{"id":377576,"date":"2024-08-07T14:43:42","date_gmt":"2024-08-07T14:43:42","guid":{"rendered":"https:\/\/innovationspace.ansys.com\/forum\/forums\/reply\/377576\/"},"modified":"2024-08-07T14:43:42","modified_gmt":"2024-08-07T14:43:42","slug":"377576","status":"publish","type":"reply","link":"https:\/\/innovationspace.ansys.com\/forum\/forums\/reply\/377576\/","title":{"rendered":"Reply To: Ansys vs. nCode Stress Value"},"content":{"rendered":"<p>&lt;p class=&#8221;MsoNormal&#8221;&gt;There are multiple reasons why the final stresses reported by Ansys nCode Designlife do not precisely match the Mechanical stresses.&lt;span style=&#8221;mso-spacerun: yes;&#8221;&gt;&nbsp; &lt;\/span&gt;The stress reported by DesignLife is the adjusted stress used in the fatigue calculations.&lt;span style=&#8221;mso-spacerun: yes;&#8221;&gt;&nbsp; &lt;\/span&gt;For StressLife fatigue, it is the stress used with the SN curve to predict the number of allowable cycles.&lt;\/p&gt;&lt;p class=&#8221;MsoNormal&#8221;&gt;By default, DesignLife calculates fatigue damage only for the surface nodes, and it assumes that a 2D plane stress state exists on the surface.&lt;span style=&#8221;mso-spacerun: yes;&#8221;&gt;&nbsp; &lt;\/span&gt;The FE nodal stresses are converted into a that stress state using local coordinate systems.&lt;span style=&#8221;mso-spacerun: yes;&#8221;&gt;&nbsp; &lt;\/span&gt;Those converted stresses will typically not match the reported 3D FE surface stresses, unless the mesh is very refined.&lt;span style=&#8221;mso-spacerun: yes;&#8221;&gt;&nbsp; &lt;\/span&gt;In addition to the surface stress state, DL will also adjust the FE stresses for factors such as, mean stress correction, surface finish, user specified scale factors, etc.&lt;\/p&gt;<\/p>\n","protected":false},"template":"","class_list":["post-377576","reply","type-reply","status-publish","hentry"],"aioseo_notices":[],"acf":[],"_links":{"self":[{"href":"https:\/\/innovationspace.ansys.com\/forum\/wp-json\/wp\/v2\/replies\/377576","targetHints":{"allow":["GET"]}}],"collection":[{"href":"https:\/\/innovationspace.ansys.com\/forum\/wp-json\/wp\/v2\/replies"}],"about":[{"href":"https:\/\/innovationspace.ansys.com\/forum\/wp-json\/wp\/v2\/types\/reply"}],"version-history":[{"count":0,"href":"https:\/\/innovationspace.ansys.com\/forum\/wp-json\/wp\/v2\/replies\/377576\/revisions"}],"wp:attachment":[{"href":"https:\/\/innovationspace.ansys.com\/forum\/wp-json\/wp\/v2\/media?parent=377576"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}