{"id":54356,"date":"2021-04-17T08:44:58","date_gmt":"2021-04-17T08:44:58","guid":{"rendered":"\/forum\/forums\/topic\/the-eigenvalue-buckling-analysis-and-the-nonlinear-buckling-analysis\/"},"modified":"2021-04-17T08:44:58","modified_gmt":"2021-04-17T08:44:58","slug":"the-eigenvalue-buckling-analysis-and-the-nonlinear-buckling-analysis","status":"closed","type":"topic","link":"https:\/\/innovationspace.ansys.com\/forum\/forums\/topic\/the-eigenvalue-buckling-analysis-and-the-nonlinear-buckling-analysis\/","title":{"rendered":"The eigenvalue Buckling Analysis and the nonlinear buckling analysis"},"content":{"rendered":"<p>Hi, I want to get the critical load for the structure below. This is a cylindrical shell,with  both ends are connected with the shell through **** threads. The second page is the scheme in WB.Both The eigenvalue Buckling Analysis and the nonlinear buckling analysis have been done. nHere is the setting of the analysis:n1 the third and fourth page is the material property.And the connection in both is bonded.n2 the boundary condition is one end with fixed support. And the force is normal to all the faces.n3 In nonlinear analysis, the load is Linearly increasing from 0 to 60MPa in 10 steps, in which the time of every step is 1s.n4 The failure criterion is the equivalent stress(Von-mise).When the stress exceeds the limit(290MPa),the load this step is the critical load.nQuestion:n1 In eigenvalue Buckling, I get the critical load is 384MPa.But in nonlinear analysis, the result is only 42MPa. I want to konw why the results differ so much.n2 From the contour of the equivalent stress in fifth picture, the max stress appears in the connection between the end and the shell. The result is not in line with reality.How should I solve the problem?nThank you for your reply.n<img loading=\"lazy\" decoding=\"async\" src=\"\/forum\/wp-content\/uploads\/forum-uploads\/855\/HHTZKQE3DUK9.png\" width=\"832\" height=\"297\" \/><img loading=\"lazy\" decoding=\"async\" src=\"\/forum\/wp-content\/uploads\/forum-uploads\/697\/827067TO6RE7.png\" width=\"537\" height=\"491\" \/><img loading=\"lazy\" decoding=\"async\" src=\"\/forum\/wp-content\/uploads\/forum-uploads\/512\/QA4QTEXS6J1F.jpg\" width=\"1022\" height=\"206\" \/><img loading=\"lazy\" decoding=\"async\" src=\"\/forum\/wp-content\/uploads\/forum-uploads\/474\/SXDVVCZO1KTN.png\" width=\"974\" height=\"298\" \/><img loading=\"lazy\" decoding=\"async\" src=\"\/forum\/wp-content\/uploads\/forum-uploads\/668\/HJGIK0NNODDF.png\" width=\"1344\" height=\"478\" \/><img loading=\"lazy\" decoding=\"async\" src=\"\/forum\/wp-content\/uploads\/forum-uploads\/544\/I2X4AHI1NWVC.jpg\" width=\"476\" height=\"226\" \/>n<\/p>\n","protected":false},"template":"","class_list":["post-54356","topic","type-topic","status-closed","hentry","topic-tag-ansys-workbench","topic-tag-static-structural"],"aioseo_notices":[],"acf":[],"custom_fields":[{"0":{"_bbp_old_topic_id":["26686"],"_bbp_old_topic_author_name_id":["Anonymous"],"_bbp_old_is_topic_anonymous_id":["false"],"_bbp_old_closed_status_id":["publish"],"_bbp_author_ip":["g~??"],"_bbp_old_sticky_status_id":["normal"],"_bbp_likes_count":["0"],"_btv_view_count":["4826"],"_bbp_subscription":["255569"],"_bbp_topic_status":["unanswered"],"_bbp_status":["publish"],"_bbp_topic_id":["54356"],"_bbp_forum_id":["27791"],"_bbp_engagement":["181447","185297"],"_bbp_voice_count":["2"],"_bbp_reply_count":["2"],"_bbp_last_reply_id":["150229"],"_bbp_last_active_id":["150229"],"_bbp_last_active_time":["2021-04-21 12:37:33"]},"test":"taozhanping"}],"_links":{"self":[{"href":"https:\/\/innovationspace.ansys.com\/forum\/wp-json\/wp\/v2\/topics\/54356","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\/54356\/revisions"}],"wp:attachment":[{"href":"https:\/\/innovationspace.ansys.com\/forum\/wp-json\/wp\/v2\/media?parent=54356"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}