{"id":345445,"date":"2024-01-19T00:06:38","date_gmt":"2024-01-19T00:06:38","guid":{"rendered":"\/forum\/forums\/topic\/element-has-become-highly-distorted\/"},"modified":"2024-02-07T01:33:13","modified_gmt":"2024-02-07T01:33:13","slug":"element-has-become-highly-distorted","status":"closed","type":"topic","link":"https:\/\/innovationspace.ansys.com\/forum\/forums\/topic\/element-has-become-highly-distorted\/","title":{"rendered":"Element has become highly distorted!!!"},"content":{"rendered":"<p>Hello Friends,<br \/>I&#8217;m currently working on a project in which I try to simulate tube mechanical rolling expansion inside the tubesheet.<\/p>\n<p><strong>&#8220;My model fails to converge due to highly distorted elements in the tube material.&#8221;<\/strong><\/p>\n<p>Here is a summary of the model setup:<br \/>1) There is no friction between the rollers and the inner surface of the tube.<br \/>2) A coefficient of less than 0.2 between the tube and tubesheet.<\/p>\n<p>3) Tube Thickness=2.5 mm and mesh element size 0.5mm.<\/p>\n<p><img loading=\"lazy\" decoding=\"async\" src=\"\/forum\/wp-content\/uploads\/sites\/2\/2024\/01\/19-01-2024-1705622646-mesh.png\" alt=\"\" width=\"498\" height=\"466\"><\/p>\n<p>4) Two movements are simulated in the model: a) Rotation around the tube axis. B) Radial to expand the tube. These roller movements have been modeled using joints.<\/p>\n<p><img decoding=\"async\" src=\"\/forum\/wp-content\/uploads\/sites\/2\/2024\/01\/18-01-2024-1705621788-Model.png\" alt=\"\"><br \/>4) Rollers are rigid.<\/p>\n<p>The following are the pre-settings that I tried to get the model to converge on:<br \/>1) I turned on the substeps: initial 100, minimum 20, and maximum 500.<br \/>2) I applied a nonlinear mechanical mesh with linear element order.<\/p>\n<p>The model fails on step 1, substep 5.&nbsp;<\/p>\n<p><img decoding=\"async\" src=\"\/forum\/wp-content\/uploads\/sites\/2\/2024\/01\/18-01-2024-1705621901-Force Convergence.png\" alt=\"\"><\/p>\n<p><img loading=\"lazy\" decoding=\"async\" src=\"\/forum\/wp-content\/uploads\/sites\/2\/2024\/01\/18-01-2024-1705621937-Violated Element.png\" alt=\"\" width=\"550\" height=\"463\"><img loading=\"lazy\" decoding=\"async\" src=\"\/forum\/wp-content\/uploads\/sites\/2\/2024\/01\/18-01-2024-1705621960-Newton-Raphson.png\" alt=\"\" width=\"547\" height=\"475\"><\/p>\n<p><img loading=\"lazy\" decoding=\"async\" src=\"\/forum\/wp-content\/uploads\/sites\/2\/2024\/01\/18-01-2024-1705622266-Error message.png\" alt=\"\" width=\"614\" height=\"212\"><\/p>\n<p>Your help is highly appreciated.<\/p>\n","protected":false},"template":"","class_list":["post-345445","topic","type-topic","status-closed","hentry","topic-tag-ansysworkbench-ansys-staticstructural","topic-tag-elastic-plastic-material","topic-tag-Multilinearisotropichardeningmodel-1","topic-tag-workbench"],"aioseo_notices":[],"acf":[],"custom_fields":[{"0":{"_bbp_subscription":["296494","240"],"_bbp_author_ip":["23.206.193.41"]," _bbp_last_reply_id":["0"]," _bbp_likes_count":["0"],"_btv_view_count":["3692"],"_bbp_topic_status":["unanswered"],"_bbp_status":["publish"],"_bbp_topic_id":["345445"],"_bbp_forum_id":["27791"],"_bbp_engagement":["240","296494"],"_bbp_voice_count":["2"],"_bbp_reply_count":["13"],"_bbp_last_reply_id":["346864"],"_bbp_last_active_id":["346864"],"_bbp_last_active_time":["2024-01-27 15:56:57"]},"test":"pourrezamhgmail-com"}],"_links":{"self":[{"href":"https:\/\/innovationspace.ansys.com\/forum\/wp-json\/wp\/v2\/topics\/345445","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\/345445\/revisions"}],"wp:attachment":[{"href":"https:\/\/innovationspace.ansys.com\/forum\/wp-json\/wp\/v2\/media?parent=345445"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}