{"id":236200,"date":"2022-09-23T21:21:28","date_gmt":"2022-09-23T21:21:28","guid":{"rendered":"\/forum\/forums\/reply\/236200\/"},"modified":"2022-09-23T21:21:28","modified_gmt":"2022-09-23T21:21:28","slug":"236200","status":"publish","type":"reply","link":"https:\/\/innovationspace.ansys.com\/forum\/forums\/reply\/236200\/","title":{"rendered":"Reply To: Changing reference temperature of a nonlinear material"},"content":{"rendered":"<p>&lt;p&gt;Hello Helen,&lt;\/p&gt;&lt;p&gt;The MPCHG does allow the switch between nonlinear materials.&nbsp; The help on MPCHG states &#8220;Changes the material number of the specified element. Between load steps in SOLUTION, material properties cannot be changed from linear to nonlinear, or from one nonlinear option to another.&#8221;&lt;\/p&gt;&lt;p&gt;So we can not switch from say one plasticity model to another, but if all that is changing between them is say reft, or alpha, etc. then my tests show it works.&nbsp;&nbsp;&lt;\/p&gt;&lt;p&gt;You use the esel or cmsel command to select the elements, then the mpchg to change to the alternate material.&lt;\/p&gt;&lt;p&gt;Here I have a cube with a uniform thermal condition, but just the top layer of elements has a material with a different reft (defined vy the mp,reft command) At time = 2, I use a command object of mpchg,1,all, which changes the material of the top layer from material 2 to 1, which is now the same as the rest of the block and the thermal strain adjusts as expected. &nbsp;The model has plasticity and I see the plastic strains develop and persist so for my limited testing it is working as expected.&lt;\/p&gt;&lt;p&gt;While my simple test of showing MAPDL is accepting the change, you will need to double-check on your end that you see the expected results.&lt;\/p&gt;&lt;p&gt;<img loading=\"lazy\" decoding=\"async\" src=\"\/forum\/wp-content\/uploads\/sites\/2\/2022\/09\/23-09-2022-1663967745-mceclip0.png\" width=\"813\" height=\"524\" \/>&lt;\/p&gt;&lt;p&gt;&nbsp;&lt;\/p&gt;&lt;p&gt;I hope this helps!&lt;\/p&gt;&lt;p&gt;Regards,&lt;br&gt;Sean&lt;\/p&gt;&lt;p&gt;&nbsp;&lt;\/p&gt;&lt;p&gt;&nbsp;&lt;\/p&gt;<\/p>\n","protected":false},"template":"","class_list":["post-236200","reply","type-reply","status-publish","hentry"],"aioseo_notices":[],"acf":[],"_links":{"self":[{"href":"https:\/\/innovationspace.ansys.com\/forum\/wp-json\/wp\/v2\/replies\/236200","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\/236200\/revisions"}],"wp:attachment":[{"href":"https:\/\/innovationspace.ansys.com\/forum\/wp-json\/wp\/v2\/media?parent=236200"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}