{"id":305286,"date":"2023-09-07T11:32:34","date_gmt":"2023-09-07T11:32:34","guid":{"rendered":"\/forum\/forums\/topic\/problem-with-bolt-pretensioning-and-simulation\/"},"modified":"2023-09-07T11:32:34","modified_gmt":"2023-09-07T11:32:34","slug":"problem-with-bolt-pretensioning-and-simulation","status":"closed","type":"topic","link":"https:\/\/innovationspace.ansys.com\/forum\/forums\/topic\/problem-with-bolt-pretensioning-and-simulation\/","title":{"rendered":"Problem with bolt pretensioning and simulation"},"content":{"rendered":"<p>Hello everybody, I am doing a project for my thesis.<\/p>\n<p>I need to simulate three plates being hold together by 6 bolts.<\/p>\n<p>The bolts are cylindrical and threaded on the top and on the bottom part, they are secured by a 600Nm torque and by calculations (given the M24, so the diameter) the preload should be around 125kN.<\/p>\n<p>Now this being said, as contacs I put as bonded the bottom part because it is blind and goes into a thread of the lower plate, and bounded with the nut on the top thread.<\/p>\n<p>Regarding the rest of contact, so between nut and washer and washer and plate as weel as between plates i used frictional contacts with coefficient 0,2.<\/p>\n<p>If I mesh and run the simulation I get values over the strenght of the steel which seems not reasonable with high peaks in random spots regarding on the type of mesh I use.<\/p>\n<p>So I was thinking i may be applying the pretension in the wrong way, or am I wrong anywhere else?<\/p>\n<p>Any type of help is welcome.<\/p>\n<p>Attached are screenshots.<\/p>\n<p>&nbsp;<\/p>\n<p>Thank you in advance,<\/p>\n<p>Alessio<img decoding=\"async\" src=\"\/forum\/wp-content\/uploads\/sites\/2\/2023\/09\/07-09-2023-1694085934-IMG_1747_2_11zon.jpg\" alt=\"\"><img decoding=\"async\" src=\"\/forum\/wp-content\/uploads\/sites\/2\/2023\/09\/07-09-2023-1694085984-IMG_1748_2_11zon.jpg\" alt=\"\"><\/p>\n","protected":false},"template":"","class_list":["post-305286","topic","type-topic","status-closed","hentry"],"aioseo_notices":[],"acf":[],"custom_fields":[{"0":{"_bbp_subscription":["292998","200","17573"],"_bbp_author_ip":["23.206.193.146"]," _bbp_last_reply_id":["0"]," _bbp_likes_count":["0"],"_btv_view_count":["366"],"_bbp_topic_status":["unanswered"],"_bbp_status":["publish"],"_bbp_topic_id":["305286"],"_bbp_forum_id":["27791"],"_bbp_engagement":["200","17573","292998"],"_bbp_voice_count":["3"],"_bbp_reply_count":["8"],"_bbp_last_reply_id":["306100"],"_bbp_last_active_id":["306100"],"_bbp_last_active_time":["2023-09-11 13:26:52"]},"test":"pasqualealessio-lentinimail-polimi-it"}],"_links":{"self":[{"href":"https:\/\/innovationspace.ansys.com\/forum\/wp-json\/wp\/v2\/topics\/305286","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\/305286\/revisions"}],"wp:attachment":[{"href":"https:\/\/innovationspace.ansys.com\/forum\/wp-json\/wp\/v2\/media?parent=305286"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}