{"id":244432,"date":"2022-12-19T21:38:58","date_gmt":"2022-12-19T21:38:58","guid":{"rendered":"\/forum\/forums\/topic\/stress-strain-curve-with-negative-slope\/"},"modified":"2022-12-19T21:38:58","modified_gmt":"2022-12-19T21:38:58","slug":"stress-strain-curve-with-negative-slope","status":"closed","type":"topic","link":"https:\/\/innovationspace.ansys.com\/forum\/forums\/topic\/stress-strain-curve-with-negative-slope\/","title":{"rendered":"stress-strain curve with negative slope"},"content":{"rendered":"<p>Hi Ansys Community,<\/p>\n<p>I have a problem modeling the following strain-strain curves in ANSYS.<\/p>\n<p>From this curve, it is known that there is a negative stress-strain curve. I want to know how to model this material law in ANSYS.<\/p>\n<p>The purpose of using this stress-strain curve is to capture the buckling and post-buckling effects of the columns (I use beam188 element for the model).<\/p>\n<p>Are there any suggestions?<\/p>\n<p>&nbsp;<\/p>\n<p>Thanks,<\/p>\n<p>Xiao<\/p>\n<p><img decoding=\"async\" src=\"\/forum\/wp-content\/uploads\/sites\/2\/2022\/12\/19-12-2022-1671485743-mceclip0.png\"><\/p>\n","protected":false},"template":"","class_list":["post-244432","topic","type-topic","status-closed","hentry","topic-tag-ansys-apdl","topic-tag-beam188","topic-tag-material-properties"],"aioseo_notices":[],"acf":[],"custom_fields":[{"0":{"_bbp_subscription":["173800","99","6"],"_bbp_author_ip":["96.7.74.191"]," _bbp_last_reply_id":["0"]," _bbp_likes_count":["0"],"_btv_view_count":["1929"],"_bbp_topic_status":["unanswered"],"_bbp_status":["publish"],"_bbp_topic_id":["244432"],"_bbp_forum_id":["27815"],"_bbp_engagement":["6","99","173800"],"_bbp_voice_count":["3"],"_bbp_reply_count":["2"],"_bbp_last_reply_id":["244591"],"_bbp_last_active_id":["244591"],"_bbp_last_active_time":["2022-12-21 05:29:00"]},"test":"xiao"}],"_links":{"self":[{"href":"https:\/\/innovationspace.ansys.com\/forum\/wp-json\/wp\/v2\/topics\/244432","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\/244432\/revisions"}],"wp:attachment":[{"href":"https:\/\/innovationspace.ansys.com\/forum\/wp-json\/wp\/v2\/media?parent=244432"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}