{"id":404199,"date":"2025-01-09T04:27:24","date_gmt":"2025-01-09T04:27:24","guid":{"rendered":"https:\/\/innovationspace.ansys.com\/forum\/forums\/topic\/mesh-convergence-problem-in-frictional-contact\/"},"modified":"2025-01-09T04:27:24","modified_gmt":"2025-01-09T04:27:24","slug":"mesh-convergence-problem-in-frictional-contact","status":"publish","type":"topic","link":"https:\/\/innovationspace.ansys.com\/forum\/forums\/topic\/mesh-convergence-problem-in-frictional-contact\/","title":{"rendered":"Mesh Convergence Problem in Frictional Contact"},"content":{"rendered":"<p>&lt;p&gt;Hi, I tried to simulate the contact problem in a dovetail joint as illustrated below:&lt;\/p&gt;&lt;p&gt;<img loading=\"lazy\" decoding=\"async\" src=\"https:\/\/innovationspace.ansys.com\/forum\/wp-content\/uploads\/sites\/2\/2025\/01\/09-01-2025-1736395455-Picture1.jpg\" alt=\"\" width=\"237\" height=\"229\" \/>&lt;\/p&gt;&lt;p&gt;I have a problem in mesh convergence test where the contact stress keeps increasing as the mesh gets finer.&nbsp;The global mesh size is 1 mm and mesh size along the contact edges is decreased from 0.32 mm to 0.02 mm, the stress results are summarized in the following table:&lt;\/p&gt;&lt;p&gt;<em>Example of mesh:<\/em>&lt;\/p&gt;&lt;p&gt;<img decoding=\"async\" src=\"https:\/\/innovationspace.ansys.com\/forum\/wp-content\/uploads\/sites\/2\/2025\/01\/09-01-2025-1736395531-Picture5.jpg\" alt=\"\" \/>&lt;\/p&gt;&lt;p&gt;<em>Convergence history:<\/em>&lt;\/p&gt;&lt;p&gt;<img decoding=\"async\" src=\"https:\/\/innovationspace.ansys.com\/forum\/wp-content\/uploads\/sites\/2\/2025\/01\/09-01-2025-1736395326-Picture4.jpg\" alt=\"\" \/>&lt;\/p&gt;&lt;p&gt;&nbsp;The maximum von Mises stress is always at the upper contact point where the fillet starts; for example, when the edge element size is 0.01mm, the stress distribution looks like:&lt;\/p&gt;&lt;p&gt;<img loading=\"lazy\" decoding=\"async\" src=\"https:\/\/innovationspace.ansys.com\/forum\/wp-content\/uploads\/sites\/2\/2025\/01\/09-01-2025-1736395278-Picture3.jpg\" alt=\"\" width=\"464\" height=\"467\" \/>&lt;\/p&gt;&lt;p&gt;I also tried adaptive meshing by inserting a convergence in the stress output with 1% allowable change, but the results did not make sense:&lt;\/p&gt;&lt;p&gt;<img decoding=\"async\" src=\"https:\/\/innovationspace.ansys.com\/forum\/wp-content\/uploads\/sites\/2\/2025\/01\/09-01-2025-1736396268-Picture6.jpg\" alt=\"\" \/><img loading=\"lazy\" decoding=\"async\" src=\"https:\/\/innovationspace.ansys.com\/forum\/wp-content\/uploads\/sites\/2\/2025\/01\/09-01-2025-1736396332-Picture7.jpg\" alt=\"\" width=\"794\" height=\"688\" \/>&lt;\/p&gt;&lt;p&gt;Please point out where I am doing wrong and how I can get converged results.&lt;\/p&gt;&lt;p&gt;Information about this project: 2D plane stress analysis. Linear elastic material properties assumed (no plasticity). Frictional contact defined between two surfaces with a coefficient of 0.3. I also tried different element order, contact modes, contact methods and stiffness; activated large deflections; changedfillet radii, but the results were not satisfactory.&lt;\/p&gt;<\/p>\n","protected":false},"template":"","class_list":["post-404199","topic","type-topic","status-publish","hentry","topic-tag-contact","topic-tag-frictional-contact","topic-tag-mechanical","topic-tag-mesh-convergence"],"aioseo_notices":[],"acf":[],"custom_fields":[{"0":{"_bbp_forum_id":["27791"],"_bbp_topic_id":["404199"],"_bbp_subscription":["501208","88"],"_bbp_author_ip":["128.100.49.198"],"_bbp_last_reply_id":["404975"],"_bbp_last_active_id":["404975"],"_bbp_last_active_time":["2025-01-14 18:38:48"],"_bbp_reply_count":["2"],"_bbp_reply_count_hidden":["0"],"_bbp_voice_count":["2"],"_bbp_engagement":["501208","88"],"_btv_view_count":["382"],"_bbp_topic_status":["unanswered"],"_bbp_notification_enabled":["336760"]},"test":"ty-wumail-utoronto-ca"}],"_links":{"self":[{"href":"https:\/\/innovationspace.ansys.com\/forum\/wp-json\/wp\/v2\/topics\/404199","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\/404199\/revisions"}],"wp:attachment":[{"href":"https:\/\/innovationspace.ansys.com\/forum\/wp-json\/wp\/v2\/media?parent=404199"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}