{"id":32760,"date":"2019-01-21T08:28:46","date_gmt":"2019-01-21T08:28:46","guid":{"rendered":"\/forum\/forums\/topic\/plasticity-damage\/"},"modified":"2019-01-21T08:28:46","modified_gmt":"2019-01-21T08:28:46","slug":"plasticity-damage","status":"closed","type":"topic","link":"https:\/\/innovationspace.ansys.com\/forum\/forums\/topic\/plasticity-damage\/","title":{"rendered":"Plasticity &#8211; Damage"},"content":{"rendered":"<p>Hello all,<\/p>\n<p><\/p>\n<p>I&#8217;m working on reinforced concrete joint behavior under cyclic effects. I have experienced convergence issues with solid65 &#8211; conc table combination and now I&#8217;d like to look for some alternatives now.&nbsp;<\/p>\n<p><\/p>\n<p>Using Menetrey-Willam plasticity (WM + HSD6) model, I had no problem obtaining good-matching results including the softening branch, however under cyclic loads, unloading stiffness is equal to elastic state of material since there is no damage formulation in this model.<\/p>\n<p><\/p>\n<p>I wonder if it is possible to introduce a cumulative damage formulation to reduce stiffness in each loading step.&nbsp;A simple damage parameter (or separate parameters for compression and tension) which is a function of plastic strains and reduces the elements stiffness in each step of reversal loading procedure would help me I think. A possible compression damage formulation is seen in the figure below.<\/p>\n<p><\/p>\n<p><img loading=\"lazy\" decoding=\"async\" src=\"https:\/\/us.v-cdn.net\/6032193\/uploads\/attachments\/8d0e973d-719e-4566-9a32-a9dc007fd23d\/5bf5b089-0ac7-4a3a-ad33-a9dc0086cac0_damage-2.jpg?width=690&amp;upscale=false\" alt=\"\" width=\"466\" height=\"161\"><\/p>\n<p><\/p>\n<p>So, I would like to keep solution in implicit scheme and tell to the code that it should calculate a damage scalar based on strain state and modify constitutive equations. Should I use usermats or a built-in feature may help in this issue? I would be really happy if you would suggest a solution for this problem.<\/p>\n<p><\/p>\n<p>Best regards<\/p>\n<p><\/p>\n<p>&nbsp;<\/p>\n","protected":false},"template":"","class_list":["post-32760","topic","type-topic","status-closed","hentry"],"aioseo_notices":[],"acf":[],"custom_fields":[{"0":{"_bbp_old_topic_id":["4932"],"_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","0","0","0","0"],"_btv_view_count":["794"],"_bbp_subscription":["238419"],"_bbp_topic_status":["unanswered"],"_bbp_status":["publish"],"_bbp_topic_id":["32760"],"_bbp_forum_id":["27791"],"_bbp_engagement":["240","160648","161880"],"_bbp_voice_count":["3"],"_bbp_reply_count":["2"],"_bbp_last_reply_id":["75443"],"_bbp_last_active_id":["75443"],"_bbp_last_active_time":["2019-01-21 13:18:42"]},"test":"moyilmaz"}],"_links":{"self":[{"href":"https:\/\/innovationspace.ansys.com\/forum\/wp-json\/wp\/v2\/topics\/32760","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\/32760\/revisions"}],"wp:attachment":[{"href":"https:\/\/innovationspace.ansys.com\/forum\/wp-json\/wp\/v2\/media?parent=32760"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}