{"id":386787,"date":"2024-09-24T21:57:24","date_gmt":"2024-09-24T21:57:24","guid":{"rendered":"https:\/\/innovationspace.ansys.com\/forum\/forums\/topic\/convergence-issues-nonlinear-buckling-in-stiffened-plate-on-mechanical-apdl\/"},"modified":"2024-09-30T23:18:36","modified_gmt":"2024-09-30T23:18:36","slug":"convergence-issues-nonlinear-buckling-in-stiffened-plate-on-mechanical-apdl","status":"publish","type":"topic","link":"https:\/\/innovationspace.ansys.com\/forum\/forums\/topic\/convergence-issues-nonlinear-buckling-in-stiffened-plate-on-mechanical-apdl\/","title":{"rendered":"Convergence issues: Nonlinear Buckling in Stiffened Plate on Mechanical APDL"},"content":{"rendered":"<p>&lt;p&gt;&lt;p&gt;Hello. I am studying biaxial elastoplastic buckling, and I am having convergence issues. I am receiving the following error:&lt;\/p&gt;&lt;p&gt;*** ERROR *** CP = 57.703 TIME= 16:45:19&lt;br&gt;Solution not converged at time 11.1825 (load step 1 substep 1).&lt;br&gt;Run terminated.&lt;\/p&gt;&lt;p&gt;*** WARNING *** CP = 57.703 TIME= 16:45:19&lt;br&gt;The unconverged solution (identified as time 4473 substep 999999) is&lt;br&gt;output for analysis debug purposes. Results should not be used for&lt;br&gt;any other purpose.&lt;\/p&gt;&lt;p&gt;My case study is elastoplastic buckling of stiffened plates, in which I use Bilinear Isotropic Hardening.&lt;\/p&gt;&lt;p&gt;I am using PyMAPDL 0.68.4 and ANSYS Mechanical APDL 2024R2 Student Version.&lt;\/p&gt;&lt;p&gt;The generated APDL script is attached.&lt;\/p&gt;&lt;p&gt;I tried to introduce CNVTOL as a way to reach convergence, but without success.&lt;\/p&gt;&lt;p&gt;How can I modify the script above in order of it to work?&lt;\/p&gt;&lt;p&gt;Since now I thank very much for any piece of advice.&lt;\/p&gt;&lt;p&gt; &lt;\/p&gt;&lt;p&gt;The APDL code is given below:&lt;\/p&gt;&lt;br&gt;\/SOL&lt;br&gt;ANTYPE,0&lt;br&gt;NLGEOM,ON&lt;br&gt;NSUBST,200,400,100,&lt;br&gt;CNVTOL,F,0.1,,,&lt;br&gt;CNVTOL,U,0.1,,,&lt;br&gt;PSTRES,1&lt;br&gt;TIME,4473&lt;br&gt;SFL,lines_contorno_placa_ts,PRESS,4473,,,&lt;br&gt;SFL,lines_contorno_placa_ls,PRESS,4473,,,&lt;br&gt;SFL,lines_borda_ls,PRESS,4473,,,&lt;br&gt;SFL,lines_borda_ts,PRESS,4473,,,&lt;br&gt;SOLVE,&lt;\/p&gt;&lt;p&gt;&nbsp;&lt;\/p&gt;&lt;\/p&gt;<\/p>\n","protected":false},"template":"","class_list":["post-386787","topic","type-topic","status-publish","hentry","topic-tag-ansys-mechanical-apdl","topic-tag-buckling"],"aioseo_notices":[],"acf":[],"custom_fields":[{"0":{"_bbp_subscription":["262198","58821"],"_bbp_author_ip":["177.22.173.223"],"_btv_view_count":["294"],"_bbp_topic_status":["unanswered"],"_edit_last":["262198"],"_bbp_revision_log":["a:1:{i:387580;a:2:{s:6:\"author\";i:262198;s:6:\"reason\";s:40:\"Irrelevant code for the specific problem\";}}"],"_bbp_topic_id":["386787"],"_bbp_forum_id":["27791"],"_bbp_engagement":["58821","262198"],"_bbp_voice_count":["2"],"_bbp_reply_count":["4"],"_bbp_last_reply_id":["387579"],"_bbp_last_active_id":["387579"],"_bbp_last_active_time":["2024-09-30 23:16:33"]},"test":"fe62461815fe0df37947716fa87efc39494d319d"}],"_links":{"self":[{"href":"https:\/\/innovationspace.ansys.com\/forum\/wp-json\/wp\/v2\/topics\/386787","targetHints":{"allow":["GET"]}}],"collection":[{"href":"https:\/\/innovationspace.ansys.com\/forum\/wp-json\/wp\/v2\/topics"}],"about":[{"href":"https:\/\/innovationspace.ansys.com\/forum\/wp-json\/wp\/v2\/types\/topic"}],"version-history":[{"count":1,"href":"https:\/\/innovationspace.ansys.com\/forum\/wp-json\/wp\/v2\/topics\/386787\/revisions"}],"predecessor-version":[{"id":387580,"href":"https:\/\/innovationspace.ansys.com\/forum\/wp-json\/wp\/v2\/topics\/386787\/revisions\/387580"}],"wp:attachment":[{"href":"https:\/\/innovationspace.ansys.com\/forum\/wp-json\/wp\/v2\/media?parent=386787"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}