{"id":455661,"date":"2026-04-02T14:37:27","date_gmt":"2026-04-02T14:37:27","guid":{"rendered":"https:\/\/innovationspace.ansys.com\/forum\/forums\/topic\/mat275-smooth-viscoelastic-viscoplastic-material\/"},"modified":"2026-04-02T14:37:27","modified_gmt":"2026-04-02T14:37:27","slug":"mat275-smooth-viscoelastic-viscoplastic-material","status":"publish","type":"topic","link":"https:\/\/innovationspace.ansys.com\/forum\/forums\/topic\/mat275-smooth-viscoelastic-viscoplastic-material\/","title":{"rendered":"MAT275 Smooth Viscoelastic Viscoplastic material"},"content":{"rendered":"<p>&lt;p&gt;Hi all,&lt;\/p&gt;&lt;p&gt;I am trying to simulate a forming process for PET material. I am trying to use the MAT275 material model on LS DYNA V4.10.8. When I try to simulate the process, the part with MAT275 disappears from the simulation and the simulation immediately shows normal termination. I see no error messages in the .out or messag file. If i use another material model (say MAT124) then the simulation runs correctly. I am using ELFORM 15 shell elements. (Axisymmetric Solid)&lt;br&gt;&lt;br&gt;What could be the reason for this? Is it due to bad material parameter definition or is there another issue?&lt;\/p&gt;<\/p>\n","protected":false},"template":"","class_list":["post-455661","topic","type-topic","status-publish","hentry","topic-tag-2d-axisymmetric","topic-tag-viscoelastic-material-1"],"aioseo_notices":[],"acf":[],"custom_fields":[{"0":{"_bbp_forum_id":["27814"],"_bbp_topic_id":["455661"],"_bbp_subscription":["602739","13640"],"_bbp_author_ip":["129.247.247.240"],"_bbp_last_reply_id":["455677"],"_bbp_last_active_id":["455677"],"_bbp_last_active_time":["2026-04-02 16:33:36"],"_bbp_reply_count":["1"],"_bbp_reply_count_hidden":["0"],"_bbp_voice_count":["2"],"_bbp_engagement":["602739","13640"],"_btv_view_count":["37"],"_bbp_topic_status":["unanswered"]},"test":"parth-shingtedlr-de"}],"_links":{"self":[{"href":"https:\/\/innovationspace.ansys.com\/forum\/wp-json\/wp\/v2\/topics\/455661","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\/455661\/revisions"}],"wp:attachment":[{"href":"https:\/\/innovationspace.ansys.com\/forum\/wp-json\/wp\/v2\/media?parent=455661"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}