{"id":41734,"date":"2020-03-12T09:38:49","date_gmt":"2020-03-12T09:38:49","guid":{"rendered":"\/forum\/forums\/topic\/fixed-joints-instead-of-bonded-contacts-why-the-weird-similar-but-not-similar-result\/"},"modified":"2020-03-12T09:38:49","modified_gmt":"2020-03-12T09:38:49","slug":"fixed-joints-instead-of-bonded-contacts-why-the-weird-similar-but-not-similar-result","status":"closed","type":"topic","link":"https:\/\/innovationspace.ansys.com\/forum\/forums\/topic\/fixed-joints-instead-of-bonded-contacts-why-the-weird-similar-but-not-similar-result\/","title":{"rendered":"Fixed Joints instead of Bonded Contacts, why the weird (similar but not similar) result?"},"content":{"rendered":"

Hello everyone,<\/p>\n

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I am a beginner in Ansys. My problem might seem very basic, but I have not been able to find a solution in older posts, so I hope someone would be kind enough to answer my doubts.<\/p>\n

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I am working on a concrete gridshell structure. In my first attempt, I tried to model the connections (nodes between the different “bar\/rod elements”) of the gridshell by bonded contact <\/strong>(edge to edge). The solution for total deformation showed that the connection between one of the parts fails and “swings like a pendulum”.<\/p>\n

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However, that is not what I wanted. I want the nodes in the structure to be rigid and remain fixed. So I tried adding fixed joints<\/strong>. I was having trouble ‘automatically creating’ joints (as I did for the contact elements) because in the joints tab, there is no option for edge-to-edge joints (the automatically created joints were not the edge to edge joints I wanted, but edge to face). So, after creating contacts as previously, I inserted the joints tab, but kept it empty. As can be seen from the picture below, the joints tab has ‘0 connections’. <\/p>\n

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I knew this was most probably wrong, but after the solution, I got the exact same result as before (same max\/min deformation and position), except that this time, the connection of the part did not fail. It remained intact even though it had the same deformation and same principal stresses.<\/p>\n

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I want to know whether in the second attempt, joint connections were created in my structure replacing the contact elements (as I wanted)? If not, then why the change in results? If yes, then why the remaining results are exactly the same as before?<\/p>\n

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I would be extremely grateful for your reply. Thank you.<\/p>\n","protected":false},"template":"","class_list":["post-41734","topic","type-topic","status-closed","hentry"],"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