{"id":372516,"date":"2024-07-18T10:05:24","date_gmt":"2024-07-18T10:05:24","guid":{"rendered":"https:\/\/innovationspace.ansys.com\/forum\/forums\/topic\/calculation-of-stiffness-amp-mass-matrix\/"},"modified":"2024-07-18T10:05:24","modified_gmt":"2024-07-18T10:05:24","slug":"calculation-of-stiffness-amp-mass-matrix","status":"closed","type":"topic","link":"https:\/\/innovationspace.ansys.com\/forum\/forums\/topic\/calculation-of-stiffness-amp-mass-matrix\/","title":{"rendered":"Calculation of stiffness &amp; mass matrix"},"content":{"rendered":"<p>Is the shape function for the SOLID187 (10-node tetrahedron) determined solely by the given L1,L2,L3,L4?<\/p>\n<p><img loading=\"lazy\" decoding=\"async\" src=\"https:\/\/innovationspace.ansys.com\/forum\/wp-content\/uploads\/sites\/2\/2024\/07\/18-07-2024-1721297037-mceclip0.png\" width=\"682\" height=\"218\"><\/p>\n<p>I am trying to calculate the element stiffness and mass matrices using MATLAB, but the error becomes significant as the number of elements increases. Specifically, the mass matrix is calculated using &rho;&int;N&#8217;*N*dV, yet the error remains large. What could be the reason for this? (I have confirmed that the Gauss points are 4 through PRESOL and LOCI)<\/p>\n","protected":false},"template":"","class_list":["post-372516","topic","type-topic","status-closed","hentry","topic-tag-finite-element-method","topic-tag-mass-matrix-1","topic-tag-stiffness-matrix"],"aioseo_notices":[],"acf":[],"custom_fields":[{"0":{"_bbp_subscription":["80516","88"],"_bbp_author_ip":["166.104.168.157"]," _bbp_last_reply_id":["0"]," _bbp_likes_count":["0"],"_btv_view_count":["340"],"_bbp_topic_status":["unanswered"],"_bbp_topic_id":["372516"],"_bbp_forum_id":["27791"],"_bbp_engagement":["88","80516"],"_bbp_voice_count":["2"],"_bbp_reply_count":["1"],"_bbp_last_reply_id":["373227"],"_bbp_last_active_id":["373227"],"_bbp_last_active_time":["2024-07-23 12:34:57"]},"test":"dhjang4522gmail-com"}],"_links":{"self":[{"href":"https:\/\/innovationspace.ansys.com\/forum\/wp-json\/wp\/v2\/topics\/372516","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\/372516\/revisions"}],"wp:attachment":[{"href":"https:\/\/innovationspace.ansys.com\/forum\/wp-json\/wp\/v2\/media?parent=372516"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}