{"id":46280,"date":"2020-07-18T20:56:35","date_gmt":"2020-07-18T20:56:35","guid":{"rendered":"\/forum\/forums\/topic\/entering-material-model-for-a-polymer-using-multilinear-hardening-model\/"},"modified":"2020-07-18T20:56:35","modified_gmt":"2020-07-18T20:56:35","slug":"entering-material-model-for-a-polymer-using-multilinear-hardening-model","status":"closed","type":"topic","link":"https:\/\/innovationspace.ansys.com\/forum\/forums\/topic\/entering-material-model-for-a-polymer-using-multilinear-hardening-model\/","title":{"rendered":"Entering Material Model for a Polymer using Multilinear hardening model"},"content":{"rendered":"<p>Hello<\/p>\n<p><\/p>\n<p>I am trying to use the plastic strain failure model for a material with the below stress-strain curve.<\/p>\n<p><\/p>\n<p><img decoding=\"async\" src=\"https:\/\/us.v-cdn.net\/6032193\/uploads\/attachments\/fb70fc07-7f8f-4fca-afe1-ab34011355d5\/bd2ff561-0478-4af1-bdac-abfc015515b0_capture.jpg?width=690&amp;upscale=false\" alt=\"\"><\/p>\n<p><\/p>\n<p>I use the relation introduced in this thread (<a href=\"\/forums\/topic\/multilinear-kinematic-plasticity-material-model-create-from-a-stress-strain-graph\/\">\/forum\/forums\/topic\/multilinear-kinematic-plasticity-material-model-create-from-a-stress-strain-graph\/<\/a>)&nbsp;to obtain true stress-true strain curve and &#8220;plastic strain&#8221;. But the problem is that large value of strain in this polymeric material leads to a negative value for plastic strain. The below table:<\/p>\n<p><\/p>\n<p><img decoding=\"async\" src=\"https:\/\/us.v-cdn.net\/6032193\/uploads\/attachments\/fb70fc07-7f8f-4fca-afe1-ab34011355d5\/e6d25367-93e5-4def-8854-abfc015821ca_capture.jpg?width=690&amp;upscale=false\" alt=\"\"><\/p>\n<p><\/p>\n<p>I wonder how I can enter this data for my material model in a multilinear hardening? And if I use Plastic Strain Failure criteria for failure, what value I should set for maximum EPS?<\/p>\n<p><\/p>\n<p>(I have attached the excel datasheet to this thread).<\/p>\n<p><\/p>\n<p>Hamed<\/p>\n","protected":false},"template":"","class_list":["post-46280","topic","type-topic","status-closed","hentry"],"aioseo_notices":[],"acf":[],"custom_fields":[{"0":{"_bbp_old_topic_id":["18463"],"_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":["1932"],"_bbp_subscription":["246198","277832"],"_bbp_topic_status":["unanswered"],"_bbp_status":["publish"],"_bbp_topic_id":["46280"],"_bbp_forum_id":["27815"],"_bbp_engagement":["240","171867","277832"],"_bbp_voice_count":["3"],"_bbp_reply_count":["10"],"_bbp_last_reply_id":["253519"],"_bbp_last_active_id":["253519"],"_bbp_last_active_time":["2023-03-12 14:55:08"]},"test":"hamednik"}],"_links":{"self":[{"href":"https:\/\/innovationspace.ansys.com\/forum\/wp-json\/wp\/v2\/topics\/46280","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\/46280\/revisions"}],"wp:attachment":[{"href":"https:\/\/innovationspace.ansys.com\/forum\/wp-json\/wp\/v2\/media?parent=46280"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}