{"id":45279,"date":"2020-06-19T12:08:35","date_gmt":"2020-06-19T12:08:35","guid":{"rendered":"\/forum\/forums\/topic\/eigenvalue-buckling-of-thin-walled-cylinders-and-stiffened-cylinders\/"},"modified":"2020-06-19T12:08:35","modified_gmt":"2020-06-19T12:08:35","slug":"eigenvalue-buckling-of-thin-walled-cylinders-and-stiffened-cylinders","status":"closed","type":"topic","link":"https:\/\/innovationspace.ansys.com\/forum\/forums\/topic\/eigenvalue-buckling-of-thin-walled-cylinders-and-stiffened-cylinders\/","title":{"rendered":"Eigenvalue Buckling of thin walled cylinders and stiffened cylinders"},"content":{"rendered":"<p>Hello,<\/p>\n<p><\/p>\n<p>&nbsp;<\/p>\n<p><\/p>\n<p>i try to run some design Optimizations for a cylinder. Therefore i want to compare different stiffner typs and a unstiffened version. When i try to run the unstiffened Version, i alwys got the same total deformation(1;1,0001m) for several r\/t(radius\/wall thickness) ratios.When i try to simulate thin walls, Ansys can&#8217;t &#8220;Performe Mode Extraction&#8221;(radius=750 thickness &lt;20mm). I tried some settings explained in the Help-Section: Checking all specific settings for linear buckling, changing the solver to Subspace(default for linear is Direct) both didn&#8217;t work.<\/p>\n<p><\/p>\n<p>Loads and Boundary conditions:<\/p>\n<p><\/p>\n<p>acceleration in axial and radial direction<\/p>\n<p><\/p>\n<p>fixed support on one front face<\/p>\n<p><\/p>\n<p>i turned of negative Load Factors<\/p>\n<p><\/p>\n<p>It did worked before, but there i mixed the Units for my Youngs&#8217; Module. (Now GPA then MPA-&gt;Factor 1000 more now)<\/p>\n<p><\/p>\n<p>&nbsp;<\/p>\n<p><\/p>\n<p>Greetings KnHw<\/p>\n","protected":false},"template":"","class_list":["post-45279","topic","type-topic","status-closed","hentry"],"aioseo_notices":[],"acf":[],"custom_fields":[{"0":{"_bbp_old_topic_id":["17460"],"_bbp_old_topic_author_name_id":["Anonymous"],"_bbp_old_is_topic_anonymous_id":["false"],"_bbp_old_closed_status_id":["publish"],"_bbp_author_ip":[null],"_bbp_old_sticky_status_id":["normal"],"_bbp_likes_count":["0"],"_btv_view_count":["1686"],"_bbp_subscription":["252839"],"_bbp_topic_status":["unanswered"],"_bbp_status":["publish"],"_bbp_topic_id":["45279"],"_bbp_forum_id":["27791"],"_bbp_engagement":["22","178716"],"_bbp_voice_count":["2"],"_bbp_reply_count":["11"],"_bbp_last_reply_id":["119168"],"_bbp_last_active_id":["119168"],"_bbp_last_active_time":["2020-06-26 17:01:56"]},"test":"knhw"}],"_links":{"self":[{"href":"https:\/\/innovationspace.ansys.com\/forum\/wp-json\/wp\/v2\/topics\/45279","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\/45279\/revisions"}],"wp:attachment":[{"href":"https:\/\/innovationspace.ansys.com\/forum\/wp-json\/wp\/v2\/media?parent=45279"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}