{"id":318248,"date":"2023-11-17T17:25:45","date_gmt":"2023-11-17T17:25:45","guid":{"rendered":"\/forum\/forums\/reply\/318248\/"},"modified":"2023-11-17T17:25:45","modified_gmt":"2023-11-17T17:25:45","slug":"318248","status":"publish","type":"reply","link":"https:\/\/innovationspace.ansys.com\/forum\/forums\/reply\/318248\/","title":{"rendered":"Reply To: Fatigue Analysis of bolts"},"content":{"rendered":"<p>&lt;p class=&#8221;MsoNormal&#8221;&gt;If you have access to the Ansys nCode DesignLife embedded Add-On, I &lt;u&gt;strongly &lt;\/u&gt;recommend using it.&lt;span style=&#8221;mso-spacerun: yes;&#8221;&gt;&nbsp; &lt;\/span&gt;It is the simplest and most correct method.&lt;span style=&#8221;mso-spacerun: yes;&#8221;&gt;&nbsp; &lt;\/span&gt;You just need to run the preload and preload+external load cases in Mechanical and specify Time Step loading in DesignLife with both result sets selected.&lt;span style=&#8221;mso-spacerun: yes;&#8221;&gt;&nbsp; &lt;\/span&gt;Note:&lt;span style=&#8221;mso-spacerun: yes;&#8221;&gt;&nbsp; &lt;\/span&gt;You can also include additional loadings if appropriate.&lt;span style=&#8221;mso-spacerun: yes;&#8221;&gt;&nbsp; &lt;\/span&gt;DesignLife will internally determine the mean and alternating stresses from all selected result sets.&lt;span style=&#8221;mso-spacerun: yes;&#8221;&gt;&nbsp; &lt;\/span&gt;You can then specify any applicable mean stress correction method (Goodman, Gerber, Interpolate, etc.) and DesignLife will apply it.&lt;\/p&gt;&lt;p class=&#8221;MsoNormal&#8221;&gt;For the 2&lt;sup&gt;nd&lt;\/sup&gt; option, yes you need to manually create new S-N curves that include the effect of mean stress.&lt;span style=&#8221;mso-spacerun: yes;&#8221;&gt;&nbsp; &lt;\/span&gt;I am not recommending this method, but it is theoretically doable.&lt;\/p&gt;&lt;p class=&#8221;MsoNormal&#8221;&gt;For the 3&lt;sup&gt;rd&lt;\/sup&gt; option, you need to apply whatever combination of two loadings that produce the desired Salt and Smean using the FT equations.&lt;span style=&#8221;mso-spacerun: yes;&#8221;&gt;&nbsp; &lt;\/span&gt;I suspect that is +\/- &frac12; the applied load, but I did not thoroughly check the math.&lt;\/p&gt;<\/p>\n","protected":false},"template":"","class_list":["post-318248","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=\"If you have access to the Ansys nCode DesignLife embedded Add-On, I strongly recommend using it. 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