{"id":394547,"date":"2024-11-20T14:54:07","date_gmt":"2024-11-20T14:54:07","guid":{"rendered":"https:\/\/innovationspace.ansys.com\/forum\/forums\/topic\/static-structural-analysis-model-doesnt-converge\/"},"modified":"2024-11-20T14:54:07","modified_gmt":"2024-11-20T14:54:07","slug":"static-structural-analysis-model-doesnt-converge","status":"publish","type":"topic","link":"https:\/\/innovationspace.ansys.com\/forum\/forums\/topic\/static-structural-analysis-model-doesnt-converge\/","title":{"rendered":"Static Structural Analysis Model Doesn&#8217;t Converge"},"content":{"rendered":"<p>&lt;p&gt;Hi, I&#8217;m new to Ansys and having trouble with this sim.&lt;\/p&gt;<\/p>\n<ul>\n<li>&lt;p&gt;The model consists of multiple parts held together by solid body bolts with simplified cylindrical shafts and T-nuts&lt;\/p&gt;\n<ul>\n<li>&lt;p&gt;Realistic contacts:&lt;\/p&gt;\n<ul>\n<li>&lt;p&gt;Nuts are bonded to bolt shafts with a tiny gap in between&lt;\/p&gt;<\/li>\n<li>&lt;p&gt;Bolt head contacts with gussets are frictional, 0.2 coefficient&lt;\/p&gt;<\/li>\n<li>&lt;p&gt;Nut contact with beam is frictional, 0.2 coefficient&lt;\/p&gt;<\/li>\n<li>&lt;p&gt;Bolt shafts to gusset and beam walls is frictionless (basically the bolt hole)&lt;\/p&gt;<\/li>\n<li>&lt;p&gt;Parts held together by physically modeled bolts have frictional contacts between them if they&rsquo;re directly connected by a fastener and frictionless otherwise&lt;\/p&gt;<\/li>\n<\/ul>\n<\/li>\n<li>&lt;p&gt;All parts without physically modeled bolts are bonded&lt;\/p&gt;<\/li>\n<\/ul>\n<\/li>\n<li>&lt;p&gt;Boundary conditions are two fixed supports where the model is cut off, plus a planar symmetry boundary condition&lt;\/p&gt;<\/li>\n<li>&lt;p&gt;500N force upward&lt;\/p&gt;<\/li>\n<li>&lt;p&gt;Fixes attempted&lt;\/p&gt;\n<ul>\n<li>&lt;p&gt;Gradual load stepping from 50N to 500N over 10 steps&lt;\/p&gt;<\/li>\n<li>&lt;p&gt;Increased substeps to 250 initial, 100 minimum, 500 max&lt;\/p&gt;<\/li>\n<li>&lt;p&gt;Removing mesh controls and using a very fine mesh&lt;\/p&gt;<\/li>\n<li>&lt;p&gt;Fixed red contacts in contact tool&lt;\/p&gt;<\/li>\n<li>&lt;p&gt;Large deflection on and off&lt;\/p&gt;<\/li>\n<\/ul>\n<\/li>\n<\/ul>\n<p>&lt;p&gt;Any advice would be greatly appreciated!&lt;\/p&gt;&lt;figure class=&#8221;rte-media&#8221;&gt;&lt;figcaption class=&#8221;rte-media-caption&#8221;&gt;<img decoding=\"async\" src=\"https:\/\/innovationspace.ansys.com\/forum\/wp-content\/uploads\/sites\/2\/2024\/11\/20-11-2024-1732114394-bolt geometry example.png\" alt=\"\" \/>&lt;br&gt;Bolt geometry example (bolt head, gusset, nut, and 80\/20 extrusion beam)&lt;\/figcaption&gt;&lt;\/figure&gt;&lt;figure class=&#8221;rte-media&#8221;&gt;<a title=\"Image from r\/ANSYS - failed convergence result\" href=\"https:\/\/preview.redd.it\/static-structural-analysis-model-doesnt-converge-v0-j4duhl4e4z1e1.png?width=1893&amp;format=png&amp;auto=webp&amp;s=72747cbf7aca3c154d92530eb9348c77fa62dd9d\" target=\"_blank\" rel=\"noopener noreferrer ugc\"><img decoding=\"async\" src=\"https:\/\/preview.redd.it\/static-structural-analysis-model-doesnt-converge-v0-j4duhl4e4z1e1.png?width=1893&amp;format=png&amp;auto=webp&amp;s=72747cbf7aca3c154d92530eb9348c77fa62dd9d\" alt=\"r\/ANSYS - failed convergence result\" width=\"750\" \/><\/a>&lt;figcaption class=&#8221;rte-media-caption&#8221;&gt;Failed convergence result&lt;\/figcaption&gt;&lt;\/figure&gt;&lt;figure class=&#8221;rte-media&#8221;&gt;<a title=\"Image from r\/ANSYS - original mesh\" href=\"https:\/\/preview.redd.it\/static-structural-analysis-model-doesnt-converge-v0-m6ugx1wf4z1e1.png?width=1407&amp;format=png&amp;auto=webp&amp;s=453ab4e8479d7dc0fea95f6762929ba7b452c1d1\" target=\"_blank\" rel=\"noopener noreferrer ugc\"><img decoding=\"async\" src=\"https:\/\/preview.redd.it\/static-structural-analysis-model-doesnt-converge-v0-m6ugx1wf4z1e1.png?width=1407&amp;format=png&amp;auto=webp&amp;s=453ab4e8479d7dc0fea95f6762929ba7b452c1d1\" alt=\"r\/ANSYS - original mesh\" width=\"750\" \/><\/a>&lt;figcaption class=&#8221;rte-media-caption&#8221;&gt;Original mesh&lt;\/figcaption&gt;&lt;\/figure&gt;&lt;figure class=&#8221;rte-media&#8221;&gt;<a title=\"Image from r\/ANSYS - meshing with no controls, 5 or 10 mm element size I forgot lol\" href=\"https:\/\/preview.redd.it\/static-structural-analysis-model-doesnt-converge-v0-7oyq8dug4z1e1.png?width=1219&amp;format=png&amp;auto=webp&amp;s=3159bcdaefa6ca7e627e9c3d27d0f6b62e5d1987\" target=\"_blank\" rel=\"noopener noreferrer ugc\"><img decoding=\"async\" src=\"https:\/\/preview.redd.it\/static-structural-analysis-model-doesnt-converge-v0-7oyq8dug4z1e1.png?width=1219&amp;format=png&amp;auto=webp&amp;s=3159bcdaefa6ca7e627e9c3d27d0f6b62e5d1987\" alt=\"r\/ANSYS - meshing with no controls, 5 or 10 mm element size I forgot lol\" width=\"750\" \/><\/a>&lt;figcaption class=&#8221;rte-media-caption&#8221;&gt;Meshing with no controls, 5 or 10 mm element size&lt;\/figcaption&gt;&lt;\/figure&gt;&lt;figure class=&#8221;rte-media&#8221;&gt;<a title=\"Image from r\/ANSYS - bolt locations shown using pretension, which I turned off at some point\" href=\"https:\/\/preview.redd.it\/static-structural-analysis-model-doesnt-converge-v0-1b1yvu8k5z1e1.png?width=871&amp;format=png&amp;auto=webp&amp;s=ba1dfa41f13fd69c76affa85bf24c16e3612fa37\" target=\"_blank\" rel=\"noopener noreferrer ugc\"><img decoding=\"async\" src=\"https:\/\/preview.redd.it\/static-structural-analysis-model-doesnt-converge-v0-1b1yvu8k5z1e1.png?width=871&amp;format=png&amp;auto=webp&amp;s=ba1dfa41f13fd69c76affa85bf24c16e3612fa37\" alt=\"r\/ANSYS - bolt locations shown using pretension, which I turned off at some point\" width=\"750\" \/><\/a>&lt;figcaption class=&#8221;rte-media-caption&#8221;&gt;Bolt locations shown using bolt pretensions, which I turned off at some point&lt;\/figcaption&gt;&lt;\/figure&gt;<\/p>\n","protected":false},"template":"","class_list":["post-394547","topic","type-topic","status-publish","hentry"],"aioseo_notices":[],"aioseo_head":"\n\t\t<!-- All in One SEO 4.9.10 - aioseo.com -->\n\t<meta name=\"description\" content=\"Hi, I&#039;m new to Ansys and having trouble with this sim.The model consists of multiple parts held together by solid body bolts with simplified cylindrical shafts and T-nutsRealistic contacts:Nuts are bonded to bolt shafts with a tiny gap in betweenBolt head contacts with gussets are frictional, 0.2 coefficientNut contact with beam is frictional, 0.2 coefficientBolt\" \/>\n\t<meta name=\"robots\" content=\"max-image-preview:large\" \/>\n\t<link rel=\"canonical\" href=\"https:\/\/innovationspace.ansys.com\/forum\/forums\/topic\/static-structural-analysis-model-doesnt-converge\/\" \/>\n\t<meta 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