{"id":395583,"date":"2024-11-27T17:57:59","date_gmt":"2024-11-27T17:57:59","guid":{"rendered":"https:\/\/innovationspace.ansys.com\/forum\/forums\/topic\/how-to-constrain-a-3d-cylinder-so-that-it-can-expand-radially-or-longitudinally\/"},"modified":"2024-11-27T17:57:59","modified_gmt":"2024-11-27T17:57:59","slug":"how-to-constrain-a-3d-cylinder-so-that-it-can-expand-radially-or-longitudinally","status":"publish","type":"topic","link":"https:\/\/innovationspace.ansys.com\/forum\/forums\/topic\/how-to-constrain-a-3d-cylinder-so-that-it-can-expand-radially-or-longitudinally\/","title":{"rendered":"how to constrain a 3D cylinder so that it can expand radially or longitudinally"},"content":{"rendered":"<p>&lt;p&gt;This seems like it should be such an easy thing to do, but I can&#8217;t figure it out.&nbsp; Imagine that you have a thick cylinder with solid elements.&nbsp; I&#8217;d like to allow it to expand radially about it&#8217;s fixed centerline, to simulate internal pressure.&nbsp; I&#8217;d also like to be able to apply a force to one end of the cylinder to produce a longitudinal stress.&nbsp; So I somehow have to fix the annular area on the other end so that the nodes in that plane&nbsp; can expand radially, but be fixed in the z-direction, assuming the centerline runs along the z-axis.&nbsp; But everything I try leads to rigid body motion because the cylinder can either float or rotate in the xy plane.&nbsp; Any suggestions would be most appreciated.&nbsp; (PS, I know I can do this axisymmetrically, but I may have a holes or other features that kill symmetry).&lt;\/p&gt;&lt;p&gt;Thank you!&lt;\/p&gt;&lt;p&gt;Chris&lt;\/p&gt;<\/p>\n","protected":false},"template":"","class_list":["post-395583","topic","type-topic","status-publish","hentry"],"aioseo_notices":[],"acf":[],"custom_fields":[{"0":{"_bbp_forum_id":["27791"],"_bbp_topic_id":["395583"],"_bbp_subscription":["430670","3937"],"_bbp_author_ip":["108.53.47.202"],"_bbp_reply_count":["1"],"_bbp_reply_count_hidden":["0"],"_bbp_voice_count":["2"],"_bbp_engagement":["430670","3937"],"_btv_view_count":["125"],"_bbp_topic_status":["unanswered"],"_bbp_last_reply_id":["395677"],"_bbp_last_active_id":["395677"],"_bbp_last_active_time":["2024-11-28 16:03:06"]},"test":"christopherdavidsonvalcor-com"}],"_links":{"self":[{"href":"https:\/\/innovationspace.ansys.com\/forum\/wp-json\/wp\/v2\/topics\/395583","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\/395583\/revisions"}],"wp:attachment":[{"href":"https:\/\/innovationspace.ansys.com\/forum\/wp-json\/wp\/v2\/media?parent=395583"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}