{"id":45929,"date":"2020-07-08T21:00:52","date_gmt":"2020-07-08T21:00:52","guid":{"rendered":"\/forum\/forums\/topic\/snap-through-force-displacement-curve\/"},"modified":"2020-07-08T21:00:52","modified_gmt":"2020-07-08T21:00:52","slug":"snap-through-force-displacement-curve","status":"closed","type":"topic","link":"https:\/\/innovationspace.ansys.com\/forum\/forums\/topic\/snap-through-force-displacement-curve\/","title":{"rendered":"Snap through force-displacement curve"},"content":{"rendered":"<p>Hello All,<\/p>\n<p><\/p>\n<p>I am trying to model a cantilever structure with two sub-beams subjected to in-plane displacement constraints at the fixed end, as shown in the figure below. The in-plane displacement constraints cause bending and twisting deformation to the structure, which therefore becomes a bistable structure. I would like to&nbsp;do the analysis&nbsp;using Ansys and derive the nonlinear force-displacement curve. I tried to follow the example of VM17. The difference is that&nbsp;the structure is not buckling initially, instead, it&#8217;s buckled after the first load step, e.g. applied in-plane displacement. Don&#8217;t know if I need to do the buckling analysis firstly or not.&nbsp; I applied a displacement load at the free end of the cantilever according to suggestions in the forum but I am not sure it is the mentioned displacement control. I did get a curve after the analysis but it seems not what I expected a typical force-displacement curve of a bistable system with snap-through.&nbsp;<\/p>\n<p><\/p>\n<p>Could you please help check what&#8217;s wrong with my simulation. I attached the APDL code here. Thank you very much.&nbsp;<\/p>\n<p><\/p>\n<p>&nbsp;<img decoding=\"async\" src=\"https:\/\/us.v-cdn.net\/6032193\/uploads\/attachments\/ff55e4c0-c35c-4f35-9379-abe2011c15f6\/970dee73-71ed-44e3-bea7-abf2015ca1e8_capture.jpg?width=690&amp;upscale=false\" alt=\"\"><\/p>\n","protected":false},"template":"","class_list":["post-45929","topic","type-topic","status-closed","hentry"],"aioseo_notices":[],"acf":[],"custom_fields":[{"0":{"_bbp_old_topic_id":["18111"],"_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":["735"],"_bbp_subscription":["252929"],"_bbp_topic_status":["unanswered"],"_bbp_status":["publish"],"_bbp_topic_id":["45929"],"_bbp_forum_id":["27791"],"_bbp_engagement":["240","178807"],"_bbp_voice_count":["2"],"_bbp_reply_count":["6"],"_bbp_last_reply_id":["121263"],"_bbp_last_active_id":["121263"],"_bbp_last_active_time":["2020-07-13 20:14:18"]},"test":"eric_eric"}],"_links":{"self":[{"href":"https:\/\/innovationspace.ansys.com\/forum\/wp-json\/wp\/v2\/topics\/45929","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\/45929\/revisions"}],"wp:attachment":[{"href":"https:\/\/innovationspace.ansys.com\/forum\/wp-json\/wp\/v2\/media?parent=45929"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}