{"id":440119,"date":"2025-08-26T15:20:37","date_gmt":"2025-08-26T15:20:37","guid":{"rendered":"https:\/\/innovationspace.ansys.com\/forum\/forums\/topic\/necking-in-ls-dyna\/"},"modified":"2025-08-26T15:20:37","modified_gmt":"2025-08-26T15:20:37","slug":"necking-in-ls-dyna","status":"publish","type":"topic","link":"https:\/\/innovationspace.ansys.com\/forum\/forums\/topic\/necking-in-ls-dyna\/","title":{"rendered":"Necking in LS-DYNA"},"content":{"rendered":"<p>&lt;p&gt;Good evening,&lt;\/p&gt;&lt;p&gt;I&#8217;m trying to characterize a polymeric material (POM) with 187 SAMP-1 material model. At the moment, Force-Displacement values from FEM are different from experimental ones. This because the simulations starts necking, and force values go down quicky.&lt;br&gt;At the moment, I can not understand what makes the material necking and how can calibrate this phenomena (in exp. values, force goes down slowly).&lt;br&gt;Can someone help me regarding how to handle with this issue? Thank you in advance.&lt;\/p&gt;<\/p>\n","protected":false},"template":"","class_list":["post-440119","topic","type-topic","status-publish","hentry","topic-tag-ls_dyna-1","topic-tag-polymer"],"aioseo_notices":[],"acf":[],"custom_fields":[{"0":{"_bbp_forum_id":["27814"],"_bbp_topic_id":["440119"],"_bbp_subscription":["587014","13468"],"_bbp_author_ip":["192.167.208.138"],"_bbp_last_reply_id":["440673"],"_bbp_last_active_id":["440673"],"_bbp_last_active_time":["2025-09-03 11:36:28"],"_bbp_reply_count":["1"],"_bbp_reply_count_hidden":["0"],"_bbp_voice_count":["2"],"_bbp_engagement":["587014","13468"],"_btv_view_count":["278"],"_bbp_topic_status":["unanswered"]},"test":"valerio-incocciatiunife-it"}],"_links":{"self":[{"href":"https:\/\/innovationspace.ansys.com\/forum\/wp-json\/wp\/v2\/topics\/440119","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\/440119\/revisions"}],"wp:attachment":[{"href":"https:\/\/innovationspace.ansys.com\/forum\/wp-json\/wp\/v2\/media?parent=440119"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}