{"id":301151,"date":"2023-08-12T13:29:53","date_gmt":"2023-08-12T13:29:53","guid":{"rendered":"\/forum\/forums\/topic\/bolt-force-reaction-ansys-vs-analytical-result\/"},"modified":"2023-08-12T15:20:18","modified_gmt":"2023-08-12T15:20:18","slug":"bolt-force-reaction-ansys-vs-analytical-result","status":"closed","type":"topic","link":"https:\/\/innovationspace.ansys.com\/forum\/forums\/topic\/bolt-force-reaction-ansys-vs-analytical-result\/","title":{"rendered":"Bolt Force Reaction (Ansys vs Analytical Result)"},"content":{"rendered":"

Hi all, I’m currently assisting a customer to solve a simple problem where I-beam and a plate are joined by 16 bolts (bolts at the 1st row from the bottom have a different diameter) like this. The customer uses EN 1993:1-8 standard.<\/p>\n

 <\/p>\n

\n
\"r\/ANSYS<\/a><\/div>\n<\/div>\n

Problem Definition (not a confidential model)<\/em><\/span><\/p>\n

\n
\"r\/ANSYS<\/a><\/div>\n<\/div>\n

Bolt Configuration<\/em><\/span><\/p>\n

The load itself is a moment about the Z axis applied to the plate, while the other side of the I-beam is fixed. The bolts are modeled using beam elements and fixed joints applied to the beam vertex and plate bolt head-imprinted faces (MPC, Deformable Behavior). I also applied appropriate contact definitions (frictional contact applied between the plates and plate edges to flange surfaces).<\/p>\n

The goal is to evaluate the Total Force Reaction<\/strong> for each bolt<\/strong> and compare it to the analytical solution using methods from Shigley’s Mechanical Engineering Design<\/strong><\/em> book. However, the results look like this<\/p>\n

 <\/p>\n

\n
\"r\/ANSYS<\/a><\/div>\n<\/div>\n

Results<\/span><\/p>\n

As we can see, most of the bolts’ reaction forces calculated by Ansys have deviation, with a maximum deviation of 19% compared to the analytical calculation.<\/p>\n

What causes these deviations? Is my FEA model correct? The customer is confident with their analytical calculation (they are using a spreadsheet as a calculator) and they don’t have experimental data. Does analytical calculation assume the objects to have rigid behaviors? How can I convince the customer that the FEA model is already modeled correctly? Thanks.<\/p>\n","protected":false},"template":"","class_list":["post-301151","topic","type-topic","status-closed","hentry","topic-tag-mechanical-3","topic-tag-analytical-1","topic-tag-bolt","topic-tag-bolt-modelling-1","topic-tag-boltresultsbendingmomentaxialandshearforces-1"],"aioseo_notices":[],"acf":[],"custom_fields":[{"0":{"_bbp_subscription":["34322"],"_bbp_author_ip":["168.143.243.14"]," _bbp_last_reply_id":["0"]," _bbp_likes_count":["0"],"_btv_view_count":["457"],"_edit_lock":["1691853550:206317"],"_bbp_topic_status":["unanswered"],"_bbp_status":["publish"],"_bbp_topic_id":["301151"],"_bbp_forum_id":["217733"],"_bbp_engagement":["34322"],"_bbp_voice_count":["1"],"_bbp_reply_count":["0"],"_bbp_last_reply_id":["0"],"_bbp_last_active_id":["301151"],"_bbp_last_active_time":["2023-08-12 13:29:53"]},"test":"raihan-lcadfem-sea-com"}],"_links":{"self":[{"href":"https:\/\/innovationspace.ansys.com\/forum\/wp-json\/wp\/v2\/topics\/301151","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\/301151\/revisions"}],"wp:attachment":[{"href":"https:\/\/innovationspace.ansys.com\/forum\/wp-json\/wp\/v2\/media?parent=301151"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}