{"id":51996,"date":"2021-02-07T21:25:51","date_gmt":"2021-02-07T21:25:51","guid":{"rendered":"\/forum\/forums\/topic\/how-to-use-membrane-elements-in-workbench\/"},"modified":"2021-02-07T21:25:51","modified_gmt":"2021-02-07T21:25:51","slug":"how-to-use-membrane-elements-in-workbench","status":"closed","type":"topic","link":"https:\/\/innovationspace.ansys.com\/forum\/forums\/topic\/how-to-use-membrane-elements-in-workbench\/","title":{"rendered":"How to use membrane elements in Workbench"},"content":{"rendered":"<div class=\"Item-Body\">\n<div class=\"Message userContent\">\n<p>Dear all,<\/p>\n<p>I am a naive user, trying to model a circular pre-strained membrane using Ansys Workbench. I could model the circular membrane using a surface body, then using the static structural and modal analysis to find the effects of external pressure on the fundamental frequency. Everything is fine, but I found that the workbench uses shell181 elements, which, by default, incorporates bending stiffness in the analysis. I want to remove the effects of bending stiffness.<\/p>\n<p>I searched for that, and I found that I can add commands to the model as<\/p>\n<p>ET,matid,181<\/p>\n<p>KEYOPT,matid,1,1<\/p>\n<p>However, then running the model leads to a solver pivot error.<\/p>\n<p>When I also tried to use other shell elements other than the default shell181, like shell41 as<\/p>\n<p>ET,matid,41<\/p>\n<p>it ends in the same error. What should I do?<\/p>\n<div class=\"embedExternal embedImage\">\n<div class=\"embedExternal-content\">\n<a class=\"embedImage-link\" href=\"https:\/\/us.v-cdn.net\/6032193\/uploads\/UAFPUBUH3YCI\/ansys.png\" rel=\"nofollow noopener\" target=\"_blank\"><br \/>\n<img decoding=\"async\" class=\"embedImage-img\" src=\"https:\/\/us.v-cdn.net\/6032193\/uploads\/UAFPUBUH3YCI\/ansys.png\" alt=\"Ansys.png\" \/><br \/>\n<\/a><\/p>\n","protected":false},"template":"","class_list":["post-51996","topic","type-topic","status-closed","hentry","topic-tag-apdl-commands","topic-tag-mechanical","topic-tag-membrane","topic-tag-structural","topic-tag-workbench"],"aioseo_notices":[],"acf":[],"custom_fields":[{"0":{"_bbp_old_topic_id":["24276"],"_bbp_old_topic_author_name_id":["Anonymous"],"_bbp_old_is_topic_anonymous_id":["false"],"_bbp_old_closed_status_id":["publish"],"_bbp_author_ip":["???X"],"_bbp_old_sticky_status_id":["normal"],"_bbp_likes_count":["0"],"_btv_view_count":["4150"],"_bbp_subscription":["232376"],"_bbp_topic_status":["unanswered"],"_bbp_status":["publish"],"_bbp_topic_id":["51996"],"_bbp_forum_id":["27791"],"_bbp_engagement":["58821","185297","185851"],"_bbp_voice_count":["3"],"_bbp_reply_count":["9"],"_bbp_last_reply_id":["142067"],"_bbp_last_active_id":["142067"],"_bbp_last_active_time":["2021-02-11 11:24:17"]},"test":"a_sarafraz"}],"_links":{"self":[{"href":"https:\/\/innovationspace.ansys.com\/forum\/wp-json\/wp\/v2\/topics\/51996","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\/51996\/revisions"}],"wp:attachment":[{"href":"https:\/\/innovationspace.ansys.com\/forum\/wp-json\/wp\/v2\/media?parent=51996"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}