{"id":289645,"date":"2023-06-20T22:23:04","date_gmt":"2023-06-20T22:23:04","guid":{"rendered":"\/forum\/forums\/topic\/opening-large-deflection-and-solver-pivot-checking\/"},"modified":"2023-07-04T22:58:46","modified_gmt":"2023-07-04T22:58:46","slug":"opening-large-deflection-and-solver-pivot-checking","status":"closed","type":"topic","link":"https:\/\/innovationspace.ansys.com\/forum\/forums\/topic\/opening-large-deflection-and-solver-pivot-checking\/","title":{"rendered":"Opening large deflection and solver pivot checking"},"content":{"rendered":"<p>Hi all,<\/p>\n<p>&nbsp;<\/p>\n<p>I am currently trying to analyze a bridge using the finite element method. But the problem is:<\/p>\n<p>If I <strong>open<\/strong> both large deflection and solver pivot checking:<\/p>\n<p>It comes up with a warning without error, saying: <em>Solver pivot warnings or errors have been encountered during the solution. &nbsp;This is usually a result of an ill-conditioned matrix, possibly due to unreasonable material properties, an under-constrained model, or contact-related issues. &nbsp;Check results carefully.<\/em> After like 10 minutes, an error would pop up saying it is not converging.<\/p>\n<p>If I <strong>close <\/strong>both large deflection and solver pivot checking:<\/p>\n<p>As expected, no warning came up, and it solves rather quickly, but the result did not change much, with me adding cracks, which does not seem right.<\/p>\n<p>So what I did was to list out all the contact between faces and line bodies, line bodies and line bodies, and faces and faces. All contacts are fully closed except a few contacts between line bodies that are orange (large penetration). I changed the material property quite a bit, but the problem still persists. May I ask if there are any suggestions on how to proceed?<\/p>\n<p>&nbsp;<\/p>\n<p>Thanks!<\/p>\n<p>&nbsp;<\/p>\n<p>Best,<\/p>\n<p>Ted<\/p>\n<p><img decoding=\"async\" src=\"\/forum\/wp-content\/uploads\/sites\/2\/2023\/06\/20-06-2023-1687298416-Bridge.png\" alt=\"\"><\/p>\n","protected":false},"template":"","class_list":["post-289645","topic","type-topic","status-closed","hentry","topic-tag-finite-element-analysis","topic-tag-large-deflection","topic-tag-pivot-warning"],"aioseo_notices":[],"acf":[],"custom_fields":[{"0":{"_bbp_subscription":["3017","240"],"_bbp_author_ip":["23.206.193.146"]," _bbp_last_reply_id":["0"]," _bbp_likes_count":["0"],"_btv_view_count":["1151"],"_bbp_status":["publish"],"_bbp_topic_status":["unanswered"],"_bbp_topic_id":["289645"],"_bbp_forum_id":["27791"],"_bbp_engagement":["240","3017"],"_bbp_voice_count":["2"],"_bbp_reply_count":["4"],"_bbp_last_reply_id":["289655"],"_bbp_last_active_id":["289655"],"_bbp_last_active_time":["2023-06-21 01:31:40"]},"test":"sizhemandrew-cmu-edu"}],"_links":{"self":[{"href":"https:\/\/innovationspace.ansys.com\/forum\/wp-json\/wp\/v2\/topics\/289645","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":0,"href":"https:\/\/innovationspace.ansys.com\/forum\/wp-json\/wp\/v2\/topics\/289645\/revisions"}],"wp:attachment":[{"href":"https:\/\/innovationspace.ansys.com\/forum\/wp-json\/wp\/v2\/media?parent=289645"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}