{"id":293711,"date":"2023-07-18T21:02:44","date_gmt":"2023-07-18T21:02:44","guid":{"rendered":"\/forum\/forums\/reply\/293711\/"},"modified":"2023-07-18T21:36:46","modified_gmt":"2023-07-18T21:36:46","slug":"293711","status":"publish","type":"reply","link":"https:\/\/innovationspace.ansys.com\/forum\/forums\/reply\/293711\/","title":{"rendered":"Reply To: Convergence Issues in Hyperelastic Material &#8211; Non linear Structural Analysis"},"content":{"rendered":"<p>&lt;p&gt;These are linear hex elements with Full Integration and Keyop(6)=1 for mixed u-P formulation.&lt;\/p&gt;&lt;p&gt;Note that this is a quarter model: half the thickness with a symmetry plane at the midsurface and the top half of the sheet with a symmetry plane at the center of the notch slit. The reaction force is half that of a full model due to a model having only half the thickness.&lt;\/p&gt;&lt;p&gt;<img decoding=\"async\" src=\"\/forum\/wp-content\/uploads\/sites\/2\/2023\/07\/18-07-2023-1689716191-mceclip0.png\" \/>&lt;\/p&gt;&lt;p&gt;<img decoding=\"async\" src=\"\/forum\/wp-content\/uploads\/sites\/2\/2023\/07\/18-07-2023-1689713976-mceclip6.png\" \/>&lt;\/p&gt;&lt;p&gt;One problem with Hex elements is they can develop an Hourglass deformation mode.&nbsp; The following 3 slides show it being initiated.&lt;\/p&gt;&lt;p&gt;<img decoding=\"async\" src=\"\/forum\/wp-content\/uploads\/sites\/2\/2023\/07\/18-07-2023-1689713460-mceclip4.png\" \/>&lt;\/p&gt;&lt;p&gt;<img decoding=\"async\" src=\"\/forum\/wp-content\/uploads\/sites\/2\/2023\/07\/18-07-2023-1689713533-mceclip5.png\" \/>&lt;\/p&gt;&lt;p&gt;<img decoding=\"async\" src=\"\/forum\/wp-content\/uploads\/sites\/2\/2023\/07\/18-07-2023-1689713331-mceclip3.png\" \/>&lt;\/p&gt;&lt;p&gt;Here is the link to the ANSYS 2023R1 archive. <a href=\"https:\/\/jmp.sh\/zMLYOn8J\">https:\/\/jmp.sh\/zMLYOn8J<\/a>&lt;\/p&gt;<\/p>\n","protected":false},"template":"","class_list":["post-293711","reply","type-reply","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=\"These are linear hex elements with Full Integration and Keyop(6)=1 for mixed u-P formulation.Note that this is a quarter model: half the thickness with a symmetry plane at the midsurface and the top half of the sheet with a symmetry plane at the center of the notch slit. The reaction force is half that of\" \/>\n\t<meta name=\"robots\" content=\"max-image-preview:large\" \/>\n\t<link rel=\"canonical\" href=\"https:\/\/innovationspace.ansys.com\/forum\/forums\/reply\/293711\/\" \/>\n\t<meta name=\"generator\" content=\"All in One SEO (AIOSEO) 4.9.10\" \/>\n\t\t<meta property=\"og:locale\" content=\"en_US\" \/>\n\t\t<meta property=\"og:site_name\" content=\"Ansys Learning Forum | Ansys Innovation Space\" \/>\n\t\t<meta property=\"og:type\" content=\"article\" \/>\n\t\t<meta property=\"og:title\" content=\"Reply To: Convergence Issues in Hyperelastic Material \u2013 Non linear Structural Analysis | Ansys Learning Forum\" \/>\n\t\t<meta property=\"og:description\" content=\"These are linear hex elements with Full Integration and Keyop(6)=1 for mixed u-P formulation.Note that this is a quarter model: half the thickness with a symmetry plane at the midsurface and the top half of the sheet with a symmetry plane at the center of the notch slit. The reaction force is half that of\" \/>\n\t\t<meta property=\"og:url\" content=\"https:\/\/innovationspace.ansys.com\/forum\/forums\/reply\/293711\/\" \/>\n\t\t<meta property=\"og:image\" content=\"https:\/\/innovationspace.ansys.com\/forum\/forum\/wp-content\/uploads\/sites\/2\/2023\/07\/18-07-2023-1689716191-mceclip0.png\" \/>\n\t\t<meta property=\"og:image:secure_url\" content=\"https:\/\/innovationspace.ansys.com\/forum\/forum\/wp-content\/uploads\/sites\/2\/2023\/07\/18-07-2023-1689716191-mceclip0.png\" \/>\n\t\t<meta property=\"article:published_time\" content=\"2023-07-18T21:02:44+00:00\" \/>\n\t\t<meta property=\"article:modified_time\" content=\"2023-07-18T21:36:46+00:00\" \/>\n\t\t<meta name=\"twitter:card\" content=\"summary_large_image\" \/>\n\t\t<meta name=\"twitter:title\" content=\"Reply To: Convergence Issues in Hyperelastic Material \u2013 Non linear Structural Analysis | Ansys Learning Forum\" \/>\n\t\t<meta name=\"twitter:description\" content=\"These are linear hex elements with Full Integration and Keyop(6)=1 for mixed u-P formulation.Note that this is a quarter model: half the thickness with a symmetry plane at the midsurface and the top half of the sheet with a symmetry plane at the center of the notch slit. 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The reaction force is half that of\",\"inLanguage\":\"en-US\",\"isPartOf\":{\"@id\":\"https:\\\/\\\/innovationspace.ansys.com\\\/forum\\\/#website\"},\"breadcrumb\":{\"@id\":\"https:\\\/\\\/innovationspace.ansys.com\\\/forum\\\/forums\\\/reply\\\/293711\\\/#breadcrumblist\"},\"datePublished\":\"2023-07-18T21:02:44+00:00\",\"dateModified\":\"2023-07-18T21:36:46+00:00\"},{\"@type\":\"WebSite\",\"@id\":\"https:\\\/\\\/innovationspace.ansys.com\\\/forum\\\/#website\",\"url\":\"https:\\\/\\\/innovationspace.ansys.com\\\/forum\\\/\",\"name\":\"Ansys Learning Forum\",\"description\":\"Ansys Innovation Space\",\"inLanguage\":\"en-US\",\"publisher\":{\"@id\":\"https:\\\/\\\/innovationspace.ansys.com\\\/forum\\\/#organization\"}}]}\n\t\t<\/script>\n\t\t<!-- All in One SEO -->\n\n","aioseo_head_json":{"title":"Reply To: Convergence Issues in Hyperelastic Material \u2013 Non linear Structural Analysis | Ansys Learning Forum","description":"These are linear hex elements with Full Integration and Keyop(6)=1 for mixed u-P formulation.Note that this is a quarter model: half the thickness with a symmetry plane at the midsurface and the top half of the sheet with a symmetry plane at the center of the notch slit. 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The reaction force is half that of","inLanguage":"en-US","isPartOf":{"@id":"https:\/\/innovationspace.ansys.com\/forum\/#website"},"breadcrumb":{"@id":"https:\/\/innovationspace.ansys.com\/forum\/forums\/reply\/293711\/#breadcrumblist"},"datePublished":"2023-07-18T21:02:44+00:00","dateModified":"2023-07-18T21:36:46+00:00"},{"@type":"WebSite","@id":"https:\/\/innovationspace.ansys.com\/forum\/#website","url":"https:\/\/innovationspace.ansys.com\/forum\/","name":"Ansys Learning Forum","description":"Ansys Innovation Space","inLanguage":"en-US","publisher":{"@id":"https:\/\/innovationspace.ansys.com\/forum\/#organization"}}]},"og:locale":"en_US","og:site_name":"Ansys Learning Forum | Ansys Innovation Space","og:type":"article","og:title":"Reply To: Convergence Issues in Hyperelastic Material \u2013 Non linear Structural Analysis | Ansys Learning Forum","og:description":"These are linear hex elements with Full Integration and Keyop(6)=1 for mixed u-P formulation.Note that this is a quarter model: half the thickness with a symmetry plane at the midsurface and the top half of the sheet with a symmetry plane at the center of the notch slit. 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