{"id":41140,"date":"2020-02-21T13:13:46","date_gmt":"2020-02-21T13:13:46","guid":{"rendered":"\/forum\/forums\/topic\/1m-thickness-3d-model-does-not-give-the-same-results-as-2d-plane-strain-one\/"},"modified":"2020-02-21T13:13:46","modified_gmt":"2020-02-21T13:13:46","slug":"1m-thickness-3d-model-does-not-give-the-same-results-as-2d-plane-strain-one","status":"closed","type":"topic","link":"https:\/\/innovationspace.ansys.com\/forum\/forums\/topic\/1m-thickness-3d-model-does-not-give-the-same-results-as-2d-plane-strain-one\/","title":{"rendered":"1m thickness 3d model does not give the same results as 2d-plane strain one"},"content":{"rendered":"<p>Hello&nbsp;<\/p>\n<p><\/p>\n<p>I am doing a transient structural analysis on a slope(Mohr-Coulomb soil material under a time history of acceleration). As the third dimension of the slope is greater than the other two, I am inclined to model it in 2 dimension to save time as I am going to use my FE model for validation(hundreds of analyses).<\/p>\n<p><\/p>\n<p>Accordingly, I should validate my 2d results with those of 3d to be sure that my 2d model is as accurate as 3d one. In this regard, I modelled a 3d slope( with 1 m thickness) and applied the desirable boundary conditions (fixed base, constant displacement in side boundaries in x direction, constant out of plane displacement for both front and back side of my model) and acceleration but the results differ from my&nbsp;2d plane strain model. I realised that the non-zero shear stress results (s(yz) and s(xz)) in 3d modelling(which is zero in 2d-plane strain case)might be the reason of difference.<\/p>\n<p><\/p>\n<p>P.S. I did the same modelling for elastic material and i could get the same result for both 2d-plane strain and 3d under the same loading and boundary condition as for Mohr-Coulomb material.<\/p>\n<p><\/p>\n<p>Could you please tell me what should i do in order to get the same results as 2d from my 3d Mohr-Coulomb material model??<\/p>\n<p><\/p>\n<p>so , I will be able to simplify my FE model to 2d model and save so much time!<\/p>\n<p><\/p>\n<p>Thanks<\/p>\n","protected":false},"template":"","class_list":["post-41140","topic","type-topic","status-closed","hentry"],"aioseo_notices":[],"acf":[],"custom_fields":[{"0":{"_bbp_old_topic_id":["13320"],"_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":["1486"],"_bbp_subscription":["245976"],"_bbp_topic_status":["unanswered"],"_bbp_status":["publish"],"_bbp_topic_id":["41140"],"_bbp_forum_id":["27791"],"_bbp_engagement":["200","240","171641"],"_bbp_voice_count":["3"],"_bbp_reply_count":["13"],"_bbp_last_reply_id":["108597"],"_bbp_last_active_id":["108597"],"_bbp_last_active_time":["2020-03-22 15:06:28"]},"test":"psh1988"}],"_links":{"self":[{"href":"https:\/\/innovationspace.ansys.com\/forum\/wp-json\/wp\/v2\/topics\/41140","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\/41140\/revisions"}],"wp:attachment":[{"href":"https:\/\/innovationspace.ansys.com\/forum\/wp-json\/wp\/v2\/media?parent=41140"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}