{"id":358679,"date":"2024-03-24T11:41:25","date_gmt":"2024-03-24T11:41:25","guid":{"rendered":"\/forum\/forums\/topic\/analyzing-displacement-strain-discrepancy-in-layered-shell-element\/"},"modified":"2024-03-26T11:07:59","modified_gmt":"2024-03-26T11:07:59","slug":"analyzing-displacement-strain-discrepancy-in-layered-shell-element","status":"closed","type":"topic","link":"https:\/\/innovationspace.ansys.com\/forum\/forums\/topic\/analyzing-displacement-strain-discrepancy-in-layered-shell-element\/","title":{"rendered":"Analyzing displacement-strain discrepancy in layered shell element."},"content":{"rendered":"<p>I am programming a finite element program on layered shell elements myself and using ansys apdl as my programming reference. I&#8217;m only interested in the relationship between displacement and strain.<\/p>\n<p>In a simple rectangular shell model consisting of SHELL181, one side is fixed and a pressure load is applied to form a cantilevered like structure. In 2 cases, the shell is modeled by a homogeneous material and a layered material (similar to a sandwich structure). The thickness of both (the thickness of the homogeneous shell, the total thickness of the sandwich shell) is the same, and the load is changed to achieve the same deflection (Uz) for both. The strains (epsi_x, epsi_y, tau_xy) of the top (or bottom) surface of the two shells were extracted respectively, and the results showed that they were quite different. This puzzled me, because in both cases, the displacement of the shell nodes and the thickness of the shell are the same, but the strain is different. If the first-order shear deformation theory is used in the SHELL181 element, I would like to ask what is the reason behind for such difference in the layered or homogeneous cases?<\/p>\n","protected":false},"template":"","class_list":["post-358679","topic","type-topic","status-closed","hentry","topic-tag-apdl","topic-tag-displacement","topic-tag-shell-elements","topic-tag-shell181","topic-tag-strain"],"aioseo_notices":[],"acf":[],"custom_fields":[{"0":{"_bbp_subscription":["342099","61162"],"_bbp_author_ip":["96.7.218.215"]," _bbp_last_reply_id":["0"]," _bbp_likes_count":["0"],"_bbp_likes_count":["1"],"_btv_view_count":["475"],"_bbp_topic_status":["unanswered"],"_edit_lock":["1711451215:283010"],"_bbp_topic_id":["358679"],"_bbp_forum_id":["27791"],"_bbp_engagement":["61162","342099"],"_bbp_voice_count":["2"],"_bbp_reply_count":["1"],"_bbp_last_reply_id":["359329"],"_bbp_last_active_id":["359329"],"_bbp_last_active_time":["2024-03-27 18:24:11"]},"test":"12234091zju-edu-cn"}],"_links":{"self":[{"href":"https:\/\/innovationspace.ansys.com\/forum\/wp-json\/wp\/v2\/topics\/358679","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\/358679\/revisions"}],"predecessor-version":[{"id":358999,"href":"https:\/\/innovationspace.ansys.com\/forum\/wp-json\/wp\/v2\/topics\/358679\/revisions\/358999"}],"wp:attachment":[{"href":"https:\/\/innovationspace.ansys.com\/forum\/wp-json\/wp\/v2\/media?parent=358679"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}