{"id":295968,"date":"2023-08-01T17:38:22","date_gmt":"2023-08-01T17:38:22","guid":{"rendered":"\/forum\/forums\/reply\/295968\/"},"modified":"2023-08-01T17:38:22","modified_gmt":"2023-08-01T17:38:22","slug":"295968","status":"publish","type":"reply","link":"https:\/\/innovationspace.ansys.com\/forum\/forums\/reply\/295968\/","title":{"rendered":"Reply To: Norton creep constants"},"content":{"rendered":"<p>&lt;p class=&#8221;MsoNormal&#8221;&gt;&lt;span style=&#8221;font-size: 10.5pt; font-family: &#8216;Open Sans&#8217;,sans-serif; color: black; background: #FBFBFB;&#8221;&gt;Do you have deflection vs time or just the final deflection?&lt;\/span&gt;&lt;\/p&gt;&lt;p class=&#8221;MsoNormal&#8221;&gt;&lt;span style=&#8221;font-size: 10.5pt; font-family: &#8216;Open Sans&#8217;,sans-serif; color: black; background: #FBFBFB;&#8221;&gt;If you only have the final deflection, I don&rsquo;t think you have enough information to derive rate dependency.&lt;\/span&gt;&lt;\/p&gt;&lt;p class=&#8221;MsoNormal&#8221;&gt;&lt;span style=&#8221;font-size: 10.5pt; font-family: &#8216;Open Sans&#8217;,sans-serif; color: black; background: #FBFBFB;&#8221;&gt;If you have deflection vs time, you might be able to derive an equivalent creep strain (creq) and creep strain rate (dcreq), from the measured deflections and times.&lt;span style=&#8221;mso-spacerun: yes;&#8221;&gt;&nbsp; &lt;\/span&gt;&lt;\/span&gt;&lt;\/p&gt;&lt;p class=&#8221;MsoNormal&#8221;&gt;&lt;span style=&#8221;font-size: 10.5pt; font-family: &#8216;Open Sans&#8217;,sans-serif; color: black; background: #FBFBFB;&#8221;&gt;You would need to also know the dimensions of the test sample to do this.&lt;\/span&gt;&lt;\/p&gt;&lt;p class=&#8221;MsoNormal&#8221;&gt;&lt;span style=&#8221;font-size: 10.5pt; font-family: &#8216;Open Sans&#8217;,sans-serif; color: black; background: #FBFBFB;&#8221;&gt;It sounds like you have two &lsquo;constant&rsquo; stress values from the test.&lt;span style=&#8221;mso-spacerun: yes;&#8221;&gt; &lt;\/span&gt;&lt;\/span&gt;&lt;span style=&#8221;background-color: rgb(251, 251, 251); font-family: &#8216;Open Sans&#8217;, sans-serif; font-size: 10.5pt;&#8221;&gt;&nbsp;&lt;\/span&gt;&lt;\/p&gt;&lt;p class=&#8221;MsoNormal&#8221;&gt;&lt;span style=&#8221;font-size: 10.5pt; font-family: &#8216;Open Sans&#8217;,sans-serif; color: black; background: #FBFBFB;&#8221;&gt;With the above information you might be able to curve fit Norton Creep, Strain Hardening Creep, or Modified Strain hardening Creep .&lt;\/span&gt;&lt;\/p&gt;&lt;p class=&#8221;MsoNormal&#8221;&gt;&lt;span style=&#8221;font-size: 10.5pt; font-family: &#8216;Open Sans&#8217;,sans-serif; color: black; background: #FBFBFB;&#8221;&gt;Please refer to Section 6.3 of the Mechanical APDL Material Reference Guide for minimum data needed to perform creep curve fitting (&lsquo;Table 6.7:&lt;span style=&#8221;mso-spacerun: yes;&#8221;&gt;&nbsp; &lt;\/span&gt;Creep Model and Data\/Type Attribute &lsquo;) for the different creep models &lt;\/span&gt;&lt;span style=&#8221;font-size: 10.5pt; font-family: &#8216;Open Sans&#8217;,sans-serif; color: black; background: #FBFBFB;&#8221;&gt;and corresponding curve fitting procedural details.&lt;\/span&gt;&lt;\/p&gt;<\/p>\n","protected":false},"template":"","class_list":["post-295968","reply","type-reply","status-publish","hentry"],"aioseo_notices":[],"acf":[],"_links":{"self":[{"href":"https:\/\/innovationspace.ansys.com\/forum\/wp-json\/wp\/v2\/replies\/295968","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\/295968\/revisions"}],"wp:attachment":[{"href":"https:\/\/innovationspace.ansys.com\/forum\/wp-json\/wp\/v2\/media?parent=295968"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}