{"id":167510,"date":"2022-03-19T23:08:00","date_gmt":"2022-03-19T23:08:00","guid":{"rendered":"\/forum\/forums\/topic\/how-can-i-perform-modal-analysis-of-prestresses-free-free-beam\/"},"modified":"2022-03-21T18:41:33","modified_gmt":"2022-03-21T18:41:33","slug":"how-can-i-perform-modal-analysis-of-prestresses-free-free-beam","status":"closed","type":"topic","link":"https:\/\/innovationspace.ansys.com\/forum\/forums\/topic\/how-can-i-perform-modal-analysis-of-prestresses-free-free-beam\/","title":{"rendered":"How can I perform modal analysis of prestresses free-free beam"},"content":{"rendered":"<div class=\"Item-Body\">\n<div class=\"Message userContent\">\n<p>I performed a non-linear analysis of a ship structure on a static structural system. Then I transferred the plastic strain to a new plastically deformed model (using the command INISTATE). Now I need to perform modal analysis on this plastically strained prestressed hull. To do that I must first solve the model on static structural, but to solve it I must add boundary condition. The modal analysis should be performed without any boundary condition. Then the question is, how can I conduct modal analysis of prestressed free-free beam? is it even possible? <\/p>\n<p>To simplify the problem I replaced the hull with this simple beam.<\/p>\n<p>The command APDL contains the following line <\/p>\n<p>INISTATE , READ , file,ist,&#039;C:FinishedTasksInstateTest_filesdp0SYS-3MECH&#039;<\/p>\n<p>and the boundary condition defined in the pic is Weak spring on. If I turned it off, how can I solve the problem in static structure to just transfer the stresses to the modal analysis <\/p>\n<p>I would be grateful if someone can help<\/p>\n<div class=\"embedExternal embedImage\">\n<div class=\"embedExternal-content\">\n<a class=\"embedImage-link\" href=\"\/forum\/wp-content\/uploads\/forum-uploads\/947\/JRHAQ16UV9WX.png\" rel=\"nofollow noopener\" target=\"_blank\"><br \/>\n<img decoding=\"async\" class=\"embedImage-img\" src=\"\/forum\/wp-content\/uploads\/forum-uploads\/947\/JRHAQ16UV9WX.png\" alt=\"image.png\" \/><br \/>\n<\/a><\/p>\n","protected":false},"template":"","class_list":["post-167510","topic","type-topic","status-closed","hentry","topic-tag-instate-2","topic-tag-mechanical-apdl","topic-tag-modal","topic-tag-pre-stress","topic-tag-ship"],"aioseo_notices":[],"acf":[],"custom_fields":[{"0":{"_btv_view_count":["1206"],"_bbp_likes_count":["0"],"_bbp_subscription":["234986","244586"],"_bbp_topic_status":["unanswered"],"_bbp_status":["publish"],"_bbp_topic_id":["167510"],"_bbp_forum_id":["27791"],"_bbp_engagement":["88","190869","244586"],"_bbp_voice_count":["3"],"_bbp_reply_count":["6"],"_bbp_last_reply_id":["216890"],"_bbp_last_active_id":["216890"],"_bbp_last_active_time":["2022-06-27 09:54:36"]},"test":"yosri3"}],"_links":{"self":[{"href":"https:\/\/innovationspace.ansys.com\/forum\/wp-json\/wp\/v2\/topics\/167510","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\/167510\/revisions"}],"wp:attachment":[{"href":"https:\/\/innovationspace.ansys.com\/forum\/wp-json\/wp\/v2\/media?parent=167510"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}