{"id":242107,"date":"2022-11-26T00:51:48","date_gmt":"2022-11-26T00:51:48","guid":{"rendered":"\/forum\/forums\/topic\/tb-hill-orthotropic-plasticity-with-hills-criterion\/"},"modified":"2022-11-26T00:51:48","modified_gmt":"2022-11-26T00:51:48","slug":"tb-hill-orthotropic-plasticity-with-hills-criterion","status":"closed","type":"topic","link":"https:\/\/innovationspace.ansys.com\/forum\/forums\/topic\/tb-hill-orthotropic-plasticity-with-hills-criterion\/","title":{"rendered":"TB Hill-Orthotropic plasticity with Hill&#8217;s criterion"},"content":{"rendered":"<p>Hello everyone,<\/p>\n<p>I am trying to understand why and how the Hill&#8217;s model can be combined with Bilinear Isotropic (BISO) hardening rule. Since BISO can only define one yield strength and its tangent modulus, why Hill can be combined with it. If BISO was combined with Hill, in which direction of the yield strength the BISO defines?<\/p>\n<p>I am also thinking about the example given by Ansys that a Hill&#8217;s model is combined with BISO. Since Hill is for anisotropic material, why only the elastic properties of x axis is defined? Will that lead to an error?<\/p>\n<p><a title=\"Hill+BISO\" href=\"https:\/\/ansyshelp.ansys.com\/account\/secured?returnurl=\/Views\/Secured\/corp\/v201\/en\/ans_str\/Hlp_G_STR8_3.html%23strhilbis050701\" target=\"_blank\" rel=\"noopener\">https:\/\/ansyshelp.ansys.com\/account\/secured?returnurl=\/Views\/Secured\/corp\/v201\/en\/ans_str\/Hlp_G_STR8_3.html%23strhilbis050701<\/a><img decoding=\"async\" src=\"\/forum\/wp-content\/uploads\/sites\/2\/2022\/11\/26-11-2022-1669423873-hill BISO.png\" alt=\"\"><\/p>\n<p>&nbsp;<\/p>\n<p>If i wanna define the hardening rule for all directions, can anyone advise me what to make it happen?<\/p>\n<p>Thank you all in advance!<\/p>\n<p>&nbsp;<\/p>\n","protected":false},"template":"","class_list":["post-242107","topic","type-topic","status-closed","hentry","topic-tag-hardening","topic-tag-hill-1","topic-tag-orthotropic-materials","topic-tag-plasticity"],"aioseo_notices":[],"acf":[],"custom_fields":[{"0":{"_bbp_subscription":["241178","18229"],"_bbp_author_ip":["23.220.96.181"]," _bbp_last_reply_id":["0"]," _bbp_likes_count":["0"],"_btv_view_count":["2681"],"_bbp_topic_status":["unanswered"],"_bbp_status":["publish"],"_bbp_topic_id":["242107"],"_bbp_forum_id":["27791"],"_bbp_engagement":["18229","241178"],"_bbp_voice_count":["2"],"_bbp_reply_count":["5"],"_bbp_last_reply_id":["242252"],"_bbp_last_active_id":["242252"],"_bbp_last_active_time":["2022-11-28 20:39:19"]},"test":"gao13mail-ubc-ca"}],"_links":{"self":[{"href":"https:\/\/innovationspace.ansys.com\/forum\/wp-json\/wp\/v2\/topics\/242107","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\/242107\/revisions"}],"wp:attachment":[{"href":"https:\/\/innovationspace.ansys.com\/forum\/wp-json\/wp\/v2\/media?parent=242107"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}