{"id":389355,"date":"2024-10-12T06:49:59","date_gmt":"2024-10-12T06:49:59","guid":{"rendered":"https:\/\/innovationspace.ansys.com\/forum\/forums\/topic\/ive-been-trying-to-implement-eigenvalue-buckling-simulation-for-solid-elements\/"},"modified":"2025-08-20T09:10:33","modified_gmt":"2025-08-20T09:10:33","slug":"ive-been-trying-to-implement-eigenvalue-buckling-simulation-for-solid-elements","status":"closed","type":"topic","link":"https:\/\/innovationspace.ansys.com\/forum\/forums\/topic\/ive-been-trying-to-implement-eigenvalue-buckling-simulation-for-solid-elements\/","title":{"rendered":"I&#8217;ve been trying to implement eigenvalue buckling simulation for solid elements"},"content":{"rendered":"<p>&lt;p&gt;I&#8217;ve been trying to implement eigenvalue buckling simulation for solid elements using MATLAB to perform linear buckling analysis. When calculating the geometric stiffness matrix for eigenvalue buckling, I referred to ANSYS documentation Help 3-61:&nbsp;<a target=\"_new\" rel=\"noopener\">https:\/\/www.mm.bme.hu\/~gyebro\/files\/ans_help_v182\/ans_thry\/thy_geo3.html<\/a>. However, after trying it out, I found that the geometric stiffness matrix calculated using the formula differs from the one output by ANSYS APDL, which makes me doubt the result. Does anyone know how to solve this? I&rsquo;d appreciate any help or advice from experienced folks.&lt;\/p&gt;&lt;p&gt;&nbsp;&lt;\/p&gt;<\/p>\n","protected":false},"template":"","class_list":["post-389355","topic","type-topic","status-closed","hentry"],"aioseo_notices":[],"aioseo_head":"\n\t\t<!-- All in One SEO 4.9.10 - aioseo.com -->\n\t<meta name=\"description\" content=\"I&#039;ve been trying to implement eigenvalue buckling simulation for solid elements using MATLAB to perform linear buckling analysis. When calculating the geometric stiffness matrix for eigenvalue buckling, I referred to ANSYS documentation Help 3-61: https:\/\/www.mm.bme.hu\/~gyebro\/files\/ans_help_v182\/ans_thry\/thy_geo3.html. 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When calculating the geometric stiffness matrix for eigenvalue buckling, I referred to ANSYS documentation Help 3-61: https:\/\/www.mm.bme.hu\/~gyebro\/files\/ans_help_v182\/ans_thry\/thy_geo3.html. However, after trying it out, I found that the geometric stiffness matrix calculated using the formula differs from the one output\" \/>\n\t\t<meta property=\"og:url\" content=\"https:\/\/innovationspace.ansys.com\/forum\/forums\/topic\/ive-been-trying-to-implement-eigenvalue-buckling-simulation-for-solid-elements\/\" \/>\n\t\t<meta property=\"article:published_time\" content=\"2024-10-12T06:49:59+00:00\" \/>\n\t\t<meta property=\"article:modified_time\" content=\"2025-08-20T09:10:33+00:00\" \/>\n\t\t<meta name=\"twitter:card\" content=\"summary_large_image\" \/>\n\t\t<meta name=\"twitter:title\" content=\"I\u2019ve been trying to implement eigenvalue buckling simulation for solid elements | Ansys Learning Forum\" \/>\n\t\t<meta name=\"twitter:description\" content=\"I&#039;ve been trying to implement eigenvalue buckling simulation for solid elements using MATLAB to perform linear buckling analysis. When calculating the geometric stiffness matrix for eigenvalue buckling, I referred to ANSYS documentation Help 3-61: https:\/\/www.mm.bme.hu\/~gyebro\/files\/ans_help_v182\/ans_thry\/thy_geo3.html. However, after trying it out, I found that the geometric stiffness matrix calculated using the formula differs from the one output\" \/>\n\t\t<script type=\"application\/ld+json\" class=\"aioseo-schema\">\n\t\t\t{\"@context\":\"https:\\\/\\\/schema.org\",\"@graph\":[{\"@type\":\"BreadcrumbList\",\"@id\":\"https:\\\/\\\/innovationspace.ansys.com\\\/forum\\\/forums\\\/topic\\\/ive-been-trying-to-implement-eigenvalue-buckling-simulation-for-solid-elements\\\/#breadcrumblist\",\"itemListElement\":[{\"@type\":\"ListItem\",\"@id\":\"https:\\\/\\\/innovationspace.ansys.com\\\/forum#listItem\",\"position\":1,\"name\":\"Home\",\"item\":\"https:\\\/\\\/innovationspace.ansys.com\\\/forum\",\"nextItem\":{\"@type\":\"ListItem\",\"@id\":\"https:\\\/\\\/innovationspace.ansys.com\\\/forum\\\/topics\\\/#listItem\",\"name\":\"Topics\"}},{\"@type\":\"ListItem\",\"@id\":\"https:\\\/\\\/innovationspace.ansys.com\\\/forum\\\/topics\\\/#listItem\",\"position\":2,\"name\":\"Topics\",\"item\":\"https:\\\/\\\/innovationspace.ansys.com\\\/forum\\\/topics\\\/\",\"nextItem\":{\"@type\":\"ListItem\",\"@id\":\"https:\\\/\\\/innovationspace.ansys.com\\\/forum\\\/forums\\\/topic\\\/ive-been-trying-to-implement-eigenvalue-buckling-simulation-for-solid-elements\\\/#listItem\",\"name\":\"I&#8217;ve been trying to implement eigenvalue buckling simulation for solid elements\"},\"previousItem\":{\"@type\":\"ListItem\",\"@id\":\"https:\\\/\\\/innovationspace.ansys.com\\\/forum#listItem\",\"name\":\"Home\"}},{\"@type\":\"ListItem\",\"@id\":\"https:\\\/\\\/innovationspace.ansys.com\\\/forum\\\/forums\\\/topic\\\/ive-been-trying-to-implement-eigenvalue-buckling-simulation-for-solid-elements\\\/#listItem\",\"position\":3,\"name\":\"I&#8217;ve been trying to implement eigenvalue buckling simulation for solid elements\",\"previousItem\":{\"@type\":\"ListItem\",\"@id\":\"https:\\\/\\\/innovationspace.ansys.com\\\/forum\\\/topics\\\/#listItem\",\"name\":\"Topics\"}}]},{\"@type\":\"Organization\",\"@id\":\"https:\\\/\\\/innovationspace.ansys.com\\\/forum\\\/#organization\",\"name\":\"Ansys Learning Forum\",\"description\":\"Ansys Innovation Space\",\"url\":\"https:\\\/\\\/innovationspace.ansys.com\\\/forum\\\/\"},{\"@type\":\"WebPage\",\"@id\":\"https:\\\/\\\/innovationspace.ansys.com\\\/forum\\\/forums\\\/topic\\\/ive-been-trying-to-implement-eigenvalue-buckling-simulation-for-solid-elements\\\/#webpage\",\"url\":\"https:\\\/\\\/innovationspace.ansys.com\\\/forum\\\/forums\\\/topic\\\/ive-been-trying-to-implement-eigenvalue-buckling-simulation-for-solid-elements\\\/\",\"name\":\"I\\u2019ve been trying to implement eigenvalue buckling simulation for solid elements | Ansys Learning Forum\",\"description\":\"I've been trying to implement eigenvalue buckling simulation for solid elements using MATLAB to perform linear buckling analysis. 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