{"id":285427,"date":"2023-05-24T05:57:47","date_gmt":"2023-05-24T05:57:47","guid":{"rendered":"\/forum\/forums\/topic\/tied_contact-for-shell-elements-gap-between-shell-shell-and-shell-solid\/"},"modified":"2023-05-24T05:57:47","modified_gmt":"2023-05-24T05:57:47","slug":"tied_contact-for-shell-elements-gap-between-shell-shell-and-shell-solid","status":"closed","type":"topic","link":"https:\/\/innovationspace.ansys.com\/forum\/forums\/topic\/tied_contact-for-shell-elements-gap-between-shell-shell-and-shell-solid\/","title":{"rendered":"TIED_CONTACT for Shell Elements &#8211; Gap between Shell-Shell and Shell-Solid"},"content":{"rendered":"<p><span style=\"font-size: 12pt\">Hello,<\/span><\/p>\n<p><span style=\"font-size: 12pt\">I have a 5 layered model with different materials. All layers should be bonded. I read, that when using shell elements, there should be a sufficient gap between shell and solid to consider the shell thickness (but I could not find how close &#8220;sufficient&#8221; is). In my model, all Shells have a thickness of 1 mm. I also read, that the algorithm searches for connecting nodes 1\/2 of the Shell thickness in normal direction appart from the midsurface line. So I left a gap of 0.5 mm to the respective tied surface. I also set SAST and SBST to -1 mm in order to control the thickness (-0.5 mm did not work). But when running the simulation, I get an error as well as in the message file it reads: &#8220;Warning 40538 (SOL+538) Slave node is not constrained no segment was found in bucket sort.&#8221; In the picture you can see on the left side the mesh on top (no overlapping elements) and the LS Dyna view at the bottom and right the solution after calculation -&gt; the nodes are not TIED together<\/span><\/p>\n<p><span style=\"font-size: 12pt\"><img decoding=\"async\" src=\"\/forum\/wp-content\/uploads\/sites\/2\/2023\/05\/24-05-2023-1684907268-mceclip0.png\"><\/span><\/p>\n<p><span style=\"font-size: 12pt\">However, when leaving no gap between Shell elements and the corresponding tied surface, there is no warning message and no error occurs:<\/span><\/p>\n<p><span style=\"font-size: 12pt\"><img decoding=\"async\" src=\"\/forum\/wp-content\/uploads\/sites\/2\/2023\/05\/24-05-2023-1684907511-mceclip1.png\"><\/span><\/p>\n<p><span style=\"font-size: 12pt\">This is the contact definition for the first case (gap between Shell and Error\/Warning messages):<\/span><\/p>\n<p><img decoding=\"async\" src=\"\/forum\/wp-content\/uploads\/sites\/2\/2023\/05\/24-05-2023-1684907658-mceclip2.png\"><\/p>\n<p><span style=\"font-size: 12pt\">How should the contact be defined correctly? Is case B (no gap) correct or how can I define the shell thickness for case A in order to tie the nodes together?<\/span><\/p>\n<p><span style=\"font-size: 12pt\">Thank you for your support and best wishes<\/span><\/p>\n","protected":false},"template":"","class_list":["post-285427","topic","type-topic","status-closed","hentry","topic-tag-bonded-contact","topic-tag-shell-thickness-1"],"aioseo_notices":[],"acf":[],"custom_fields":[{"0":{"_bbp_subscription":["269999","3136"],"_bbp_author_ip":["23.47.145.29"]," _bbp_last_reply_id":["0"]," _bbp_likes_count":["0"],"_btv_view_count":["3058"],"_bbp_topic_status":["unanswered"],"_bbp_status":["publish"],"_bbp_topic_id":["285427"],"_bbp_forum_id":["27814"],"_bbp_engagement":["3136","269999"],"_bbp_voice_count":["2"],"_bbp_reply_count":["9"],"_bbp_last_reply_id":["285801"],"_bbp_last_active_id":["285801"],"_bbp_last_active_time":["2023-05-25 17:55:34"]},"test":"luisa-hornungh-ka-de"}],"_links":{"self":[{"href":"https:\/\/innovationspace.ansys.com\/forum\/wp-json\/wp\/v2\/topics\/285427","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\/285427\/revisions"}],"wp:attachment":[{"href":"https:\/\/innovationspace.ansys.com\/forum\/wp-json\/wp\/v2\/media?parent=285427"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}