{"id":389418,"date":"2024-10-14T02:47:47","date_gmt":"2024-10-14T02:47:47","guid":{"rendered":"https:\/\/innovationspace.ansys.com\/forum\/forums\/topic\/is-ansys-apdls-geometric-stiffness-matrix-for-solid-elements-wrong\/"},"modified":"2024-10-14T08:49:45","modified_gmt":"2024-10-14T08:49:45","slug":"is-ansys-apdls-geometric-stiffness-matrix-for-solid-elements-wrong","status":"closed","type":"topic","link":"https:\/\/innovationspace.ansys.com\/forum\/forums\/topic\/is-ansys-apdls-geometric-stiffness-matrix-for-solid-elements-wrong\/","title":{"rendered":"Is ANSYS APDL&#8217;s geometric stiffness matrix for solid elements wrong?"},"content":{"rendered":"<p>&lt;p&gt;I derived Cook&#8217;s theory and also rewrote Borst&#8217;s theory. When they introduced the calculation formula for the geometric stiffness matrix of solid elements, the geometric stiffness matrix they computed had non-zero elements. Why is the geometric stiffness matrix output by ANSYS APDL entirely composed of non-zero elements? Was the calculation incorrect?&lt;\/p&gt;<\/p>\n","protected":false},"template":"","class_list":["post-389418","topic","type-topic","status-closed","hentry"],"aioseo_notices":[],"acf":[],"custom_fields":[{"0":{"_bbp_author_ip":["172.104.33.163"],"_btv_view_count":["92"],"_bbp_topic_status":["unanswered"],"_bbp_subscription":["468725","436953"],"_bbp_status":["publish"],"_bbp_topic_id":["389418"],"_bbp_forum_id":["27791"],"_bbp_engagement":["436953","468725"],"_bbp_voice_count":["2"],"_bbp_reply_count":["2"],"_bbp_last_reply_id":["389442"],"_bbp_last_active_id":["389442"],"_bbp_last_active_time":["2024-10-14 08:49:24"]},"test":"3343534645qq-com"}],"_links":{"self":[{"href":"https:\/\/innovationspace.ansys.com\/forum\/wp-json\/wp\/v2\/topics\/389418","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\/389418\/revisions"}],"wp:attachment":[{"href":"https:\/\/innovationspace.ansys.com\/forum\/wp-json\/wp\/v2\/media?parent=389418"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}