{"id":161654,"date":"2021-08-26T21:13:22","date_gmt":"2021-08-26T21:13:22","guid":{"rendered":"\/forum\/forums\/topic\/bolts-as-line-bodies-with-shell-elements-thermal-modelling\/"},"modified":"2021-09-15T13:58:54","modified_gmt":"2021-09-15T13:58:54","slug":"bolts-as-line-bodies-with-shell-elements-thermal-modelling","status":"closed","type":"topic","link":"https:\/\/innovationspace.ansys.com\/forum\/forums\/topic\/bolts-as-line-bodies-with-shell-elements-thermal-modelling\/","title":{"rendered":"Bolts as Line Bodies with shell elements thermal modelling"},"content":{"rendered":"<div class=\"Item-Body\">\n<div class=\"Message userContent\">\n<p>We regularly run 3D thermal &#8211; mechanical simulations with hundreds of bolts. We have always used simplified cylindrical 3D bolt and nut bodies, but I would like to know if it is possible to achieve the same results with line bodies with shell\/beam elements. I believe the problem will be in the transient thermal side of the analysis. On our 3D models, we typically use convective heat transfer on all the exposed surfaces and a macro to apply the combined convection\/radiation effective heat transfer between the bolt holes and bolt shanks. I setup a simple model to start exploring whether its possible to do something similar on a line body, but even with only a convection applied to my block and all heat transfer coming through the contacts, I see a big difference in response between the 1D and 3D bolt elements. <\/p>\n<p>The line body is on left and coarse and fine 3D bodies are on the right. This is relatively slow heat transfer (.001 BTU\/s-sqin-F at 900F on all sides of the block for 30 min), but the line body is responding much faster than the 3D bodies (which are a decent match given the difference in mesh density). <\/p>\n<div class=\"embedExternal embedImage\">\n<div class=\"embedExternal-content\">\n<a class=\"embedImage-link\" href=\"\/forum\/wp-content\/uploads\/forum-uploads\/893\/957GO1QXEBMQ.png\" rel=\"nofollow noopener\" target=\"_blank\"><br \/>\n<img decoding=\"async\" class=\"embedImage-img\" src=\"\/forum\/wp-content\/uploads\/forum-uploads\/893\/957GO1QXEBMQ.png\" alt=\"image.png\" \/><br \/>\n<\/a><\/p>\n","protected":false},"template":"","class_list":["post-161654","topic","type-topic","status-closed","hentry","topic-tag-beams-and-shells","topic-tag-bolted-connectios-1","topic-tag-convection","topic-tag-heat-transfer","topic-tag-line-body"],"aioseo_notices":[],"acf":[],"custom_fields":[{"0":{"_bbp_author_ip":[""],"_bbp_old_reply_author_name_id":["Anonymous"],"_bbp_old_is_reply_anonymous_id":["false"],"_btv_view_count":["1350"],"_bbp_likes_count":["0"],"_bbp_topic_status":["unanswered"],"_bbp_status":["publish"],"_bbp_topic_id":["161654"],"_bbp_forum_id":["27791"],"_bbp_engagement":["99","71539"],"_bbp_voice_count":["2"],"_bbp_reply_count":["1"],"_bbp_last_reply_id":["190099"],"_bbp_last_active_id":["190099"],"_bbp_last_active_time":["2021-09-15 13:58:54"]},"test":"kyle1-bensonge-com"}],"_links":{"self":[{"href":"https:\/\/innovationspace.ansys.com\/forum\/wp-json\/wp\/v2\/topics\/161654","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\/161654\/revisions"}],"wp:attachment":[{"href":"https:\/\/innovationspace.ansys.com\/forum\/wp-json\/wp\/v2\/media?parent=161654"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}