{"id":42531,"date":"2020-04-07T10:39:46","date_gmt":"2020-04-07T10:39:46","guid":{"rendered":"\/forum\/forums\/topic\/mpc184-and-link180-connection-for-thermal-expansion\/"},"modified":"2020-04-07T10:39:46","modified_gmt":"2020-04-07T10:39:46","slug":"mpc184-and-link180-connection-for-thermal-expansion","status":"closed","type":"topic","link":"https:\/\/innovationspace.ansys.com\/forum\/forums\/topic\/mpc184-and-link180-connection-for-thermal-expansion\/","title":{"rendered":"MPC184 and LINK180 connection for thermal expansion"},"content":{"rendered":"

Hello everyone,<\/p>\n

<\/p>\n

I’m working on a complex project for my thesis using Ansys APDL involving cables and revolute joints.<\/p>\n

<\/p>\n

Since all my solutions didn’t work well, I tried to simplify the problem to find where I was wrong. <\/p>\n

<\/p>\n

This simplified model consists in a bar (modeled with LINK180) connected at its ends through pins on two wedged beams (modeled with BEAM188). This bar has tension only behaviour (reason why i choose LINK180 instead of another beam element) and can rotate on the beam’s axes. I need to find the displacement and stress on the stucture caused by an elongation on the bar (which I apply using a thermal expansion)<\/p>\n

<\/p>\n

Firstly I tried to connect directly link element with beams; applying a difference of Temperature DT, the bar expands and consequently beams bends on the external side. This is actually what I want but, since link180 nodes haven’t rotational dof, if one beam moves upward\/downwards this solution doesn’t work anymore.<\/p>\n

<\/p>\n

So I defined an MPC184 Revo Joint element on both side of the bar to conect it on the beams. In this case if I apply the same DT nothing happened, as if the relative displacement dof was constrained.<\/p>\n

<\/p>\n

Probably I’m wrong but it seems that the issue is related to the command NLGEOM,ON which is needed to use MPC elements.<\/p>\n

<\/p>\n

Here below I attach code files of both cases.<\/p>\n

<\/p>\n

Could you help me to find a solution and understand where am I doing wrong, please?<\/p>\n

<\/p>\n

 <\/p>\n

<\/p>\n

Thank you in advance.<\/p>\n

<\/p>\n

Best regards.<\/p>\n

<\/p>\n

 <\/p>\n

<\/p>\n

 <\/p>\n","protected":false},"template":"","class_list":["post-42531","topic","type-topic","status-closed","hentry"],"aioseo_notices":[],"acf":[],"custom_fields":[{"0":{"_bbp_old_topic_id":["14711"],"_bbp_old_topic_author_name_id":["Anonymous"],"_bbp_old_is_topic_anonymous_id":["false"],"_bbp_old_closed_status_id":["publish"],"_bbp_author_ip":[null],"_bbp_old_sticky_status_id":["normal"],"_bbp_likes_count":["0"],"_btv_view_count":["2939"],"_bbp_topic_status":["unanswered"],"_bbp_status":["publish"],"_bbp_topic_id":["42531"],"_bbp_forum_id":["27791"],"_bbp_engagement":["22","165504"],"_bbp_voice_count":["2"],"_bbp_reply_count":["14"],"_bbp_last_reply_id":["112267"],"_bbp_last_active_id":["112267"],"_bbp_last_active_time":["2020-04-23 17:25:40"]},"test":"matt92x"}],"_links":{"self":[{"href":"https:\/\/innovationspace.ansys.com\/forum\/wp-json\/wp\/v2\/topics\/42531","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\/42531\/revisions"}],"wp:attachment":[{"href":"https:\/\/innovationspace.ansys.com\/forum\/wp-json\/wp\/v2\/media?parent=42531"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}