{"id":369069,"date":"2024-05-29T14:05:04","date_gmt":"2024-05-29T14:05:04","guid":{"rendered":"\/forum\/forums\/topic\/which-beam-properties-to-use-to-build-a-beam-with-arbitrary-sections\/"},"modified":"2024-05-29T14:13:17","modified_gmt":"2024-05-29T14:13:17","slug":"which-beam-properties-to-use-to-build-a-beam-with-arbitrary-sections","status":"closed","type":"topic","link":"https:\/\/innovationspace.ansys.com\/forum\/forums\/topic\/which-beam-properties-to-use-to-build-a-beam-with-arbitrary-sections\/","title":{"rendered":"Which beam properties to use to build a beam with arbitrary sections"},"content":{"rendered":"<p>Hey gals and guys,<\/p>\n<p>I am about to build up a beam for a wind turbine blade. I have a cross sectional analysis tool that gives me the 6&#215;6 stiffness and mass matrices of the blade cross sections. These can be extracted for diferent reference systems.<\/p>\n<ol>\n<li>A coordinate system of the cross section with in a reference point in the cross section as I define it<\/li>\n<li>In the same coordinate system as defined by me but with the origin moved to the elastic center of the cross section (Additional output: location elastic center)<\/li>\n<li>In the principal axis system moved to the elastic center of the cross section. (Additional output: location elastic center and angle of principal axes)<\/li>\n<\/ol>\n<p>Which matrices should I use? And where do I put the element nodes &#8211; elastic center or reference point of cross section?<\/p>\n<p>&nbsp;<\/p>\n<p>I build the cross section in Ansys classic APDL with the below code. Here X1,Y1,Z1 would be the either the reference point or the elastic center of the cross sections. K is the stiffness matrix and M the mass matrix for the composite cross section.<\/p>\n<p>&nbsp; &nbsp; ! nodes<br \/>&nbsp; &nbsp; N,1,X1,Y1,Z1<br \/>&nbsp; &nbsp; N,2i,X2,Y2,Z2<br \/>&nbsp; &nbsp;&nbsp;<br \/>&nbsp; &nbsp; ! beam properties<br \/>&nbsp; &nbsp; SECTYPE, &nbsp; &nbsp; &nbsp;1,COMB,MATRIX, &nbsp; &nbsp;<br \/>&nbsp; &nbsp; CBMX,1, &nbsp;K(1,1), K(1,2), &nbsp;K(1,3), &nbsp;K(1,4), &nbsp;K(1,5), K(1,6)<br \/>&nbsp; &nbsp; CBMX,2,&nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; K(2,2), &nbsp;K(2,3), &nbsp;K(2,4), &nbsp;K(2,5), K(2,6)<br \/>&nbsp; &nbsp; CBMX,3,&nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp;K(3,3), &nbsp;K(3,4), &nbsp;K(3,5), K(3,6)<br \/>&nbsp; &nbsp; CBMX,4,&nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; K(4,4), &nbsp;K(4,5), K(4,6)<br \/>&nbsp; &nbsp; CBMX,5,&nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp;K(5,5), K(5,6)<br \/>&nbsp; &nbsp; CBMX,6,&nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp;K(6,6)<br \/>&nbsp; &nbsp;&nbsp;<br \/>&nbsp; &nbsp; CBMD,1, &nbsp;M(1,1), M(1,2), &nbsp;M(1,3), &nbsp;M(1,4),&nbsp; M(1,5), M(1,6)<br \/>&nbsp; &nbsp; CBMD,2,&nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; M(2,2), &nbsp;M(2,3), &nbsp;M(2,4), &nbsp;M(2,5), M(2,6)<br \/>&nbsp; &nbsp; CBMD,3,&nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp;M(3,3), &nbsp;M(3,4), &nbsp;M(3,5), M(3,6)<br \/>&nbsp; &nbsp; CBMD,4,&nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; M(4,4), &nbsp;M(4,5), M(4,6)<br \/>&nbsp; &nbsp; CBMD,5,&nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp;M(5,5), M(5,6)<br \/>&nbsp; &nbsp; CBMD,6,&nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp;M(6,6)<br \/>&nbsp; &nbsp;&nbsp;<br \/>&nbsp; &nbsp; ! elements<br \/>&nbsp; &nbsp; SECNUM,1<br \/>&nbsp; &nbsp; E,1,1,2<\/p>\n<p>&nbsp;<\/p>\n<p>Thank you for your help \ud83d\ude42<\/p>\n","protected":false},"template":"","class_list":["post-369069","topic","type-topic","status-closed","hentry","topic-tag-beam","topic-tag-beam-analysis-1","topic-tag-beam188","topic-tag-composite","topic-tag-cross-section"],"aioseo_notices":[],"acf":[],"custom_fields":[{"0":{"_bbp_subscription":["342810","58821"],"_bbp_author_ip":["184.24.96.207"]," _bbp_last_reply_id":["0"]," _bbp_likes_count":["0"],"_btv_view_count":["524"],"_bbp_topic_status":["unanswered"],"_edit_lock":["1716992868:294463"],"_bbp_topic_id":["369069"],"_bbp_forum_id":["27791"],"_bbp_engagement":["58821","342810"],"_bbp_voice_count":["2"],"_bbp_reply_count":["4"],"_bbp_last_reply_id":["369101"],"_bbp_last_active_id":["369101"],"_bbp_last_active_time":["2024-05-29 15:42:28"]},"test":"pnoevernorvento-com"}],"_links":{"self":[{"href":"https:\/\/innovationspace.ansys.com\/forum\/wp-json\/wp\/v2\/topics\/369069","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":1,"href":"https:\/\/innovationspace.ansys.com\/forum\/wp-json\/wp\/v2\/topics\/369069\/revisions"}],"predecessor-version":[{"id":369074,"href":"https:\/\/innovationspace.ansys.com\/forum\/wp-json\/wp\/v2\/topics\/369069\/revisions\/369074"}],"wp:attachment":[{"href":"https:\/\/innovationspace.ansys.com\/forum\/wp-json\/wp\/v2\/media?parent=369069"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}