{"id":301156,"date":"2023-08-12T14:16:26","date_gmt":"2023-08-12T14:16:26","guid":{"rendered":"\/forum\/?post_type=topic&p=301156"},"modified":"2023-08-12T15:20:45","modified_gmt":"2023-08-12T15:20:45","slug":"deviation-between-ansys-bolt-fea-results-and-analytical-solutions","status":"closed","type":"topic","link":"https:\/\/innovationspace.ansys.com\/forum\/forums\/topic\/deviation-between-ansys-bolt-fea-results-and-analytical-solutions\/","title":{"rendered":"Deviation between Ansys Bolt FEA Results and Analytical Solutions"},"content":{"rendered":"

Hi all, I’m currently assisting my colleague 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). The load and boundary condition can be seen below. The standard used for this case is EN 1993-1-8.<\/p>\n

 <\/p>\n

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

Problem Definition<\/span><\/em><\/p>\n

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

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

I modeled the bolts using beam elements and fixed joints applied to the beam vertex and plate bolt head-imprinted faces (MPC, Deformable Behavior).<\/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

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

Results<\/em><\/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? My colleague is confident with his analytical calculation (I already checked it) and he doesn’t have experimental data. Does analytical calculation assume the objects to have rigid behaviors? How can I convince my colleague that the FEA model is already modeled correctly? Thanks!<\/p>\n","protected":false},"template":"","class_list":["post-301156","topic","type-topic","status-closed","hentry","topic-tag-bolt","topic-tag-bolt-modelling-1","topic-tag-mechanical"],"aioseo_notices":[],"aioseo_head":"\n\t\t\n\t\n\t\n\t\n\t\n\t\t\n\t\t\n\t\t\n\t\t\n\t\t\n\t\t\n\t\t\n\t\t\n\t\t\n\t\t\n\t\t\n\t\t\n\t\t\n\t\t\n\t\t