{"id":346767,"date":"2024-01-26T12:28:55","date_gmt":"2024-01-26T12:28:55","guid":{"rendered":"\/forum\/forums\/topic\/beam-elements-under-combined-bending-moment-not-giving-correct-max-stress\/"},"modified":"2024-01-26T12:28:55","modified_gmt":"2024-01-26T12:28:55","slug":"beam-elements-under-combined-bending-moment-not-giving-correct-max-stress","status":"closed","type":"topic","link":"https:\/\/innovationspace.ansys.com\/forum\/forums\/topic\/beam-elements-under-combined-bending-moment-not-giving-correct-max-stress\/","title":{"rendered":"Beam elements under combined bending moment not giving correct max stress"},"content":{"rendered":"<p>I am setting a question for my 2nd yr Mech Eng students to show them the effect of combined bending moments on asymetic beams and show them how the results of a beam model is compared against solid brick elements and the theory.&nbsp;<\/p>\n<p>Solid elements give correct deflection and max stress but beam elements, when under combined stress, gives wrong max stress. With another colleague, we guess this is because the location the stress is taken from is wrong but not sure how to change the location of max stress in a beam element. This seems to be something the software should pick automatically.&nbsp;<\/p>\n<p>The questions is below. If you have any feedback or suggestion, we will apprecaite so we can find the same max stress from all three methods.&nbsp;<\/p>\n<p><img loading=\"lazy\" decoding=\"async\" src=\"\/forum\/wp-content\/uploads\/sites\/2\/2024\/01\/26-01-2024-1706271265-mceclip0.png\" width=\"1110\" height=\"493\"><\/p>\n<p>The max stress of 534 MPa occurs at point B shown below. This is because this point has max distance from the neutral axis which is not completely aligned\/perpendicular to the sides of the cross sectoin.&nbsp;<\/p>\n<p><span style=\"font-size: 12.0pt;font-family: 'Aptos',sans-serif;color: black\"><img loading=\"lazy\" decoding=\"async\" src=\"\/forum\/wp-content\/uploads\/sites\/2\/2024\/01\/26-01-2024-1706271380-mceclip1.png\" width=\"154\" height=\"256\"><!--[endif]--><\/span><\/p>\n<p><span style=\"font-size: 12.0pt;font-family: 'Aptos',sans-serif;color: black\">It seems Ansys picks point A to report max stress. So, we found that if we pick point A, Ansys&#8217;s max stress point is matching analytical method&#8217;s prediction of stress of 347 MPa. But obviously this is value is not max stress. See belwo. Anysis beam element works fine if the cross section is not tilted and if the load is aligned with one of the sides.&nbsp;<\/span><\/p>\n<p><span style=\"font-size: 12.0pt;font-family: 'Aptos',sans-serif;color: black\"><img loading=\"lazy\" decoding=\"async\" src=\"\/forum\/wp-content\/uploads\/sites\/2\/2024\/01\/26-01-2024-1706271960-mceclip2.png\" width=\"347\" height=\"209\"><\/span><\/p>\n<p>Any comment or advice will be apprecaite.&nbsp;<\/p>\n<p>&nbsp;<\/p>\n","protected":false},"template":"","class_list":["post-346767","topic","type-topic","status-closed","hentry","topic-tag-ansysworkbench-ansys-staticstructural","topic-tag-beam-elements"],"aioseo_notices":[],"acf":[],"custom_fields":[{"0":{"_bbp_subscription":["337751","20905"],"_bbp_author_ip":["96.7.218.215"]," _bbp_last_reply_id":["0"]," _bbp_likes_count":["0"],"_btv_view_count":["971"],"_bbp_topic_status":["unanswered"],"_bbp_topic_id":["346767"],"_bbp_forum_id":["27791"],"_bbp_engagement":["20905","337751"],"_bbp_voice_count":["2"],"_bbp_reply_count":["2"],"_bbp_last_reply_id":["347149"],"_bbp_last_active_id":["347149"],"_bbp_last_active_time":["2024-01-29 22:14:50"]},"test":"m-jalalvandsoton-ac-uk"}],"_links":{"self":[{"href":"https:\/\/innovationspace.ansys.com\/forum\/wp-json\/wp\/v2\/topics\/346767","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\/346767\/revisions"}],"wp:attachment":[{"href":"https:\/\/innovationspace.ansys.com\/forum\/wp-json\/wp\/v2\/media?parent=346767"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}