{"id":43269,"date":"2020-04-26T18:00:27","date_gmt":"2020-04-26T18:00:27","guid":{"rendered":"\/forum\/forums\/topic\/contact-formulation-for-beam-with-bolted-joints-using-shell-elements\/"},"modified":"2020-04-26T18:00:27","modified_gmt":"2020-04-26T18:00:27","slug":"contact-formulation-for-beam-with-bolted-joints-using-shell-elements","status":"closed","type":"topic","link":"https:\/\/innovationspace.ansys.com\/forum\/forums\/topic\/contact-formulation-for-beam-with-bolted-joints-using-shell-elements\/","title":{"rendered":"Contact formulation for beam with bolted joints, using shell elements"},"content":{"rendered":"<p>Hi all, newcomer to the forums here with a bolt joining problem.&nbsp;<\/p>\n<p><\/p>\n<p>&nbsp;<\/p>\n<p><\/p>\n<p>I am trying to model a beam, split across the middle, joined with a top and bottom plate and 4 bolts through it. Geometry as seen in figure 1.&nbsp;<\/p>\n<p><img decoding=\"async\" src=\"https:\/\/us.v-cdn.net\/6032193\/uploads\/attachments\/3f85e3ec-a525-41cc-b822-aba9008c10d1\/3add113d-32c5-4471-8f06-aba90116a5a8_geometry.jpg?width=690&amp;upscale=false\" alt=\"Figure 1: Full Geometry of Experiment\"><\/p>\n<p><\/p>\n<p><strong>Figure 1 : Full geometry of experimental model<\/strong><\/p>\n<p><\/p>\n<p>I&#8217;ve made a 3D and 2D model and I am now making a model which models the beam and plates with shell elements and the bolts as full 3D. However, I&#8217;ve ran into some issues with establishing contact.&nbsp;<\/p>\n<p>I would like to establish a frictional\/frictionless contact between the bolt and the holes&nbsp;of the middle beams&nbsp;(the bolts are bonded to the top and bottom clamps and that works just fine) and also I would like to establish a frictional\/frictionless contact between the end faces of the beams.&nbsp;<\/p>\n<p><\/p>\n<p>&nbsp;<\/p>\n<p><\/p>\n<p><img decoding=\"async\" src=\"https:\/\/us.v-cdn.net\/6032193\/uploads\/attachments\/3f85e3ec-a525-41cc-b822-aba9008c10d1\/8e2a96ed-17e9-402d-974e-aba9011731b8_bolt-top-and-bottom-bonded.jpg?width=690&amp;upscale=false\" alt=\"Figure 2: Bonded connection with top and bottom of bolts\"><\/p>\n<p><\/p>\n<p><strong>Figure 2: Bonded connection for top and bottom of bolts with top and bottom clamps respectively<\/strong><\/p>\n<p><\/p>\n<p><img decoding=\"async\" src=\"https:\/\/us.v-cdn.net\/6032193\/uploads\/attachments\/3f85e3ec-a525-41cc-b822-aba9008c10d1\/3f3094a1-04d9-4442-a90e-aba901186b60_bolt-middle-frictionless.jpg?width=690&amp;upscale=false\" alt=\"Figure 3: Frictionless connection of mid-bolts to beam halves\"><\/p>\n<p><\/p>\n<p><strong>Figure 3: Frictionless connection of mid-bolts to beam halves<\/strong><\/p>\n<p><\/p>\n<p><img decoding=\"async\" src=\"https:\/\/us.v-cdn.net\/6032193\/uploads\/attachments\/3f85e3ec-a525-41cc-b822-aba9008c10d1\/89ba9c3d-a546-4957-a66b-aba90118c54b_frictionless-left-right.jpg?width=690&amp;upscale=false\" alt=\"Figure 4: Frictionless connection between plate halves\"><\/p>\n<p><\/p>\n<p><strong>Figure 4: Frictionless contact between beam halves<\/strong><\/p>\n<p><\/p>\n<p>My connections so far are pictured in figures 2-4 and the resulting issues displacement in a modal analysis is pictured in figure 5 and 6.&nbsp;<\/p>\n<p><\/p>\n<p><img decoding=\"async\" src=\"https:\/\/us.v-cdn.net\/6032193\/uploads\/attachments\/3f85e3ec-a525-41cc-b822-aba9008c10d1\/9dc3d2b3-8842-4c34-87a9-aba901194ba4_clip-issue-2.jpg?width=690&amp;upscale=false\" alt=\"Figure 5: Clipping issue of bolt holes not interacting with bolts\"><\/p>\n<p><\/p>\n<p><strong>Figure 5: Bolts not interacting with bolt holes<\/strong><\/p>\n<p><\/p>\n<p><img decoding=\"async\" src=\"https:\/\/us.v-cdn.net\/6032193\/uploads\/attachments\/3f85e3ec-a525-41cc-b822-aba9008c10d1\/67da998a-33c1-4c87-a4d3-aba901197e3a_clip-issue.jpg?width=690&amp;upscale=false\" alt=\"Figure 6: Beam halves clipping through each other\"><\/p>\n<p><\/p>\n<p><strong>Figure 6: Beam halves clipping through each other<\/strong><\/p>\n<p><\/p>\n<p>As seen, the problem is any other contact aside from &#8220;Bonded&#8221; between the bolts and the two beam halves results in invalid results (see figure 5) additionally&nbsp;the two beam halves clip through each other (figure 6).&nbsp;<\/p>\n<p><\/p>\n<p>How would I go about establishing effective frictionless contact between bolts &#8211; bolt holes and between the ends of the beams, in such a way it also allows pretension further down the line? Bearing in mind the beams are made of shells and are not solid.&nbsp;<\/p>\n<p><\/p>\n<p>Attached is my project archive, SGBJM Modal contains the model as seen above.&nbsp;<\/p>\n","protected":false},"template":"","class_list":["post-43269","topic","type-topic","status-closed","hentry"],"aioseo_notices":[],"acf":[],"custom_fields":[{"0":{"_bbp_old_topic_id":["15450"],"_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":["5350"],"_bbp_subscription":["250482"],"_bbp_topic_status":["unanswered"],"_bbp_status":["publish"],"_bbp_topic_id":["43269"],"_bbp_forum_id":["27791"],"_bbp_engagement":["240","176317"],"_bbp_voice_count":["2"],"_bbp_reply_count":["12"],"_bbp_last_reply_id":["112851"],"_bbp_last_active_id":["112851"],"_bbp_last_active_time":["2020-04-28 22:23:39"]},"test":"aren"}],"_links":{"self":[{"href":"https:\/\/innovationspace.ansys.com\/forum\/wp-json\/wp\/v2\/topics\/43269","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\/43269\/revisions"}],"wp:attachment":[{"href":"https:\/\/innovationspace.ansys.com\/forum\/wp-json\/wp\/v2\/media?parent=43269"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}