{"id":390389,"date":"2024-10-18T10:32:40","date_gmt":"2024-10-18T10:32:40","guid":{"rendered":"https:\/\/innovationspace.ansys.com\/forum\/forums\/topic\/geometric-stiffness-matrix-for-solid-elements\/"},"modified":"2024-10-21T13:20:27","modified_gmt":"2024-10-21T13:20:27","slug":"geometric-stiffness-matrix-for-solid-elements","status":"publish","type":"topic","link":"https:\/\/innovationspace.ansys.com\/forum\/forums\/topic\/geometric-stiffness-matrix-for-solid-elements\/","title":{"rendered":"Geometric stiffness matrix for solid elements"},"content":{"rendered":"<p>&lt;p&gt;&lt;p&gt;Hello, We have recently attempted to calculate the geometric stiffness matrix for solid elements using the methods described in the ANSYS help documentation, as well as the theories of Bathe, Cook, Borst, N\u011bmec, and Wriggers. However, the resulting geometric stiffness matrices consistently differ from those output by ANSYS APDL. We would like to confirm whether the computational principles used by ANSYS APDL for the geometric stiffness matrix differ from those documented in publicly available literature, or if there are any specific internal reference materials on this topic. Thank you for your response!&lt;\/p&gt;&lt;\/p&gt;<\/p>\n","protected":false},"template":"","class_list":["post-390389","topic","type-topic","status-publish","hentry","topic-tag-ansys-apdl","topic-tag-solid-element-1","topic-tag-stiffness-matrix","topic-tag-theory"],"aioseo_notices":[],"acf":[],"custom_fields":[{"0":{"_bbp_author_ip":["218.203.224.81"],"_btv_view_count":["2054"],"_bbp_topic_status":["unanswered"],"_edit_last":["9935"],"_bbp_revision_log":["a:1:{i:390640;a:2:{s:6:\"author\";i:9935;s:6:\"reason\";s:0:\"\";}}"],"_bbp_subscription":["13934","468725"],"_bbp_likes_count":["1"],"_bbp_notification_enabled":["468725"],"_bbp_topic_id":["390389"],"_bbp_forum_id":["27791"],"_bbp_engagement":["13934","468725"],"_bbp_voice_count":["2"],"_bbp_reply_count":["5"],"_bbp_last_reply_id":["391681"],"_bbp_last_active_id":["391681"],"_bbp_last_active_time":["2024-10-29 06:11:58"]},"test":"3343534645qq-com"}],"_links":{"self":[{"href":"https:\/\/innovationspace.ansys.com\/forum\/wp-json\/wp\/v2\/topics\/390389","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":1,"href":"https:\/\/innovationspace.ansys.com\/forum\/wp-json\/wp\/v2\/topics\/390389\/revisions"}],"predecessor-version":[{"id":390640,"href":"https:\/\/innovationspace.ansys.com\/forum\/wp-json\/wp\/v2\/topics\/390389\/revisions\/390640"}],"wp:attachment":[{"href":"https:\/\/innovationspace.ansys.com\/forum\/wp-json\/wp\/v2\/media?parent=390389"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}