{"id":37925,"date":"2019-09-25T16:18:16","date_gmt":"2019-09-25T16:18:16","guid":{"rendered":"\/forum\/forums\/topic\/pre-stress-from-static-analysis-possibly-not-being-taken-into-consideration-in-harmonic-analysis\/"},"modified":"2019-09-25T16:18:16","modified_gmt":"2019-09-25T16:18:16","slug":"pre-stress-from-static-analysis-possibly-not-being-taken-into-consideration-in-harmonic-analysis","status":"closed","type":"topic","link":"https:\/\/innovationspace.ansys.com\/forum\/forums\/topic\/pre-stress-from-static-analysis-possibly-not-being-taken-into-consideration-in-harmonic-analysis\/","title":{"rendered":"Pre-stress from static analysis possibly not being taken into consideration in harmonic analysis"},"content":{"rendered":"<p>Hello!<\/p>\n<p><\/p>\n<p>I am currently trying to understand how static structural results are used as pre-stress input in modal\/harmonic analyses, especially when it comes to stress calculation.<\/p>\n<p><\/p>\n<p>To do so, I created a static structural analysis with a beam clamped at one extremity, and a force (1000 kN) applied on the other extremity. The Von Mises stress distribution is just as expected, about 100 MPa (the cross section area of the beam is 100 mm x 100 mm).<\/p>\n<p><\/p>\n<p><img decoding=\"async\" src=\"https:\/\/us.v-cdn.net\/6032193\/uploads\/attachments\/026ab1ad-dee0-4efa-9975-aad300eeb9f2\/93cd223e-2846-4897-a060-aad300f566b0_capture-setup.jpg?width=690&amp;upscale=false\" alt=\"\"><\/p>\n<p><\/p>\n<p><img decoding=\"async\" src=\"https:\/\/us.v-cdn.net\/6032193\/uploads\/attachments\/026ab1ad-dee0-4efa-9975-aad300eeb9f2\/1c98a241-8cfb-4d17-8495-aad300f57cb3_capture-stress.jpg?width=690&amp;upscale=false\" alt=\"\"><\/p>\n<p><\/p>\n<p>Later on, I attached the results from this analysis to a modal analysis, and finally I did the same with the results from the modal analysis to a harmonic analysis, with a base excitation of 100 m\/s&sup2;.<\/p>\n<p><\/p>\n<p><img decoding=\"async\" src=\"https:\/\/us.v-cdn.net\/6032193\/uploads\/attachments\/026ab1ad-dee0-4efa-9975-aad300eeb9f2\/39dca277-590c-4551-884b-aad300f684fc_capture2.jpg?width=690&amp;upscale=false\" alt=\"\"><\/p>\n<p><\/p>\n<p>However, the stress distribution of the harmonic analysis is nowhere near 100 MPa, which is the stress from the static structural analysis.<\/p>\n<p><\/p>\n<p><img decoding=\"async\" src=\"https:\/\/us.v-cdn.net\/6032193\/uploads\/attachments\/026ab1ad-dee0-4efa-9975-aad300eeb9f2\/8034a4ea-a3d0-4224-8ccf-aad300f7f54a_capture3.jpg?width=690&amp;upscale=false\" alt=\"\"><\/p>\n<p><\/p>\n<p>Could anyone explain to me why this happens? Shouldn&#8217;t it be around 100 MPa?<\/p>\n<p><\/p>\n<p>Thank you in advance<\/p>\n<p><\/p>\n<p>Regards,<\/p>\n<p><\/p>\n<p>Lucas<\/p>\n<p><\/p>\n<p>&nbsp;<\/p>\n","protected":false},"template":"","class_list":["post-37925","topic","type-topic","status-closed","hentry"],"aioseo_notices":[],"acf":[],"custom_fields":[{"0":{"_bbp_old_topic_id":["10103"],"_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":["1854"],"_bbp_subscription":["243253"],"_bbp_topic_status":["unanswered"],"_bbp_status":["publish"],"_bbp_topic_id":["37925"],"_bbp_forum_id":["27791"],"_bbp_engagement":["240","168824"],"_bbp_voice_count":["2"],"_bbp_reply_count":["5"],"_bbp_last_reply_id":["95031"],"_bbp_last_active_id":["95031"],"_bbp_last_active_time":["2019-09-27 17:11:03"]},"test":"lpt19"}],"_links":{"self":[{"href":"https:\/\/innovationspace.ansys.com\/forum\/wp-json\/wp\/v2\/topics\/37925","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\/37925\/revisions"}],"wp:attachment":[{"href":"https:\/\/innovationspace.ansys.com\/forum\/wp-json\/wp\/v2\/media?parent=37925"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}