{"id":406978,"date":"2025-01-24T16:49:00","date_gmt":"2025-01-24T16:49:00","guid":{"rendered":"https:\/\/innovationspace.ansys.com\/forum\/forums\/topic\/incomprehensible-out-of-plane-displacement-in-composite-plate-analysis\/"},"modified":"2025-01-27T11:49:50","modified_gmt":"2025-01-27T11:49:50","slug":"incomprehensible-out-of-plane-displacement-in-composite-plate-analysis","status":"publish","type":"topic","link":"https:\/\/innovationspace.ansys.com\/forum\/forums\/topic\/incomprehensible-out-of-plane-displacement-in-composite-plate-analysis\/","title":{"rendered":"Incomprehensible out-of-plane displacement in composite plate analysis"},"content":{"rendered":"<p>&lt;p&gt;&lt;p&gt;Hello there, I&#8217;m doing a simple composite plate analysis to validate and compare mechanical properties of different composite materials.&nbsp;&lt;br&gt;I&#8217;ve used ACP Pre to define my stacking sequence and then ran the simulation in Static Structural.&nbsp;&lt;\/p&gt;&lt;p&gt;The BCs are displayed in the first picture. Fixed support on the left (blue) side and an in-plane force on the right (red) side. These BCs serve to simulate tensile tests.&lt;br&gt;&lt;br&gt;<img decoding=\"async\" src=\"https:\/\/innovationspace.ansys.com\/forum\/wp-content\/uploads\/sites\/2\/2025\/01\/24-01-2025-1737736784-mceclip0.png\" \/>&lt;\/p&gt;&lt;p&gt;The predicted outcome would be an in-plane displacement, representative of the tensile test. However, as you can see in the second picture below, the plate is rotating and, therefore, displacing out of the plane. No rotation has been induced.&nbsp;&lt;br&gt;I&#8217;m using Quad4 (CQUAD4) elements, therefore SHELL181. Going through the documentation, the DoF should allow for the expected results, however that is not the case.&nbsp;&lt;br&gt;I&#8217;ve tried this analysis on another solver and the results were the ones expected. I&#8217;ve tried additionally with SOLID185 elements and, again, the outcome was as expected &#8211; like a tensile test.&lt;br&gt;&lt;br&gt;My only question is therefore why does the analysis with the Quad4 elements not provide the expected results?&nbsp;&lt;br&gt;&lt;br&gt;Thanks in advance!&lt;br&gt;&lt;br&gt;<img decoding=\"async\" src=\"https:\/\/innovationspace.ansys.com\/forum\/wp-content\/uploads\/sites\/2\/2025\/01\/24-01-2025-1737736795-mceclip1.png\" \/>&lt;\/p&gt;&lt;\/p&gt;<\/p>\n","protected":false},"template":"","class_list":["post-406978","topic","type-topic","status-publish","hentry","topic-tag-acp-ansys-2","topic-tag-acp-compositematerials-2","topic-tag-bcs","topic-tag-composite","topic-tag-composite-analysis","topic-tag-composite-material","topic-tag-properties","topic-tag-quad-1","topic-tag-question-1","topic-tag-static-structural"],"aioseo_notices":[],"acf":[],"custom_fields":[{"0":{"_bbp_forum_id":["27791"],"_bbp_topic_id":["406978"],"_bbp_subscription":["507021","240","58821"],"_bbp_author_ip":["85.88.143.226"],"_bbp_last_reply_id":["407134"],"_bbp_last_active_id":["407134"],"_bbp_last_active_time":["2025-01-27 10:48:50"],"_bbp_reply_count":["4"],"_bbp_reply_count_hidden":["0"],"_bbp_voice_count":["3"],"_bbp_engagement":["507021","240","58821"],"_btv_view_count":["285"],"_bbp_topic_status":["unanswered"],"_edit_last":["52629"],"_bbp_revision_log":["a:1:{i:407168;a:2:{s:6:\"author\";i:52629;s:6:\"reason\";s:0:\"\";}}"]},"test":"26baf3e6e52126b655e2c9cd3cb8ff81c022fad8"}],"_links":{"self":[{"href":"https:\/\/innovationspace.ansys.com\/forum\/wp-json\/wp\/v2\/topics\/406978","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\/406978\/revisions"}],"predecessor-version":[{"id":407168,"href":"https:\/\/innovationspace.ansys.com\/forum\/wp-json\/wp\/v2\/topics\/406978\/revisions\/407168"}],"wp:attachment":[{"href":"https:\/\/innovationspace.ansys.com\/forum\/wp-json\/wp\/v2\/media?parent=406978"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}