{"id":302982,"date":"2023-08-24T01:34:29","date_gmt":"2023-08-24T01:34:29","guid":{"rendered":"\/forum\/forums\/topic\/undetectable-error-mostly-combat-instabilities\/"},"modified":"2023-08-24T01:34:29","modified_gmt":"2023-08-24T01:34:29","slug":"undetectable-error-mostly-combat-instabilities","status":"closed","type":"topic","link":"https:\/\/innovationspace.ansys.com\/forum\/forums\/topic\/undetectable-error-mostly-combat-instabilities\/","title":{"rendered":"Undetectable Error &#8211; mostly combat instabilities"},"content":{"rendered":"<p>Hello,<\/p>\n<p>I&#8217;m trying to model a full RC bridge using LS-DYNA. In this model, one of the pier columns is subjected to the impact of a Single Unit Truck. After that, an explosion charge is detonated.&nbsp;<\/p>\n<p>I&#8217;m using the ALE approach to model the Air, Soil, and Explosive, and all structural elements are modeled using solid elements (except steel reinforcement which is modeled using beam elements). Unfortunately, I&#8217;m encountering some issues that I couldn&#8217;t resolve over the last two weeks.&nbsp;<\/p>\n<p>All Lagrangian solid elements are deleted at the very beginning (first two to three time steps), and I get error termination even without an explicit error message. I&#8217;ve tried several things to resolve the problem, as summarized below, but nothing changes:<br \/>1- reducing time step scaling factor (TSSF) and (DT2MS).<br \/>2- Changing solid element type to constant stress (Elform = 1).<br \/>3- Using Types 4 and 5 hourglass controls with a coefficient ranging between 0.01 and 0.05.<br \/>4- Reconstructing the mesh.<br \/>5- Using IMASCL = 2 in the Control ALE option.<\/p>\n<p>Any recommendations?<\/p>\n","protected":false},"template":"","class_list":["post-302982","topic","type-topic","status-closed","hentry","topic-tag-an-unknown-error-occured-1","topic-tag-ansys-ls-dyna-1","topic-tag-instability","topic-tag-negative-volume-detected","topic-tag-warnings"],"aioseo_notices":[],"acf":[],"custom_fields":[{"0":{"_bbp_subscription":["292063","290865","3136"],"_bbp_author_ip":["23.206.193.154"]," _bbp_last_reply_id":["0"]," _bbp_likes_count":["0"],"_btv_view_count":["821"],"_bbp_topic_status":["unanswered"],"_bbp_status":["publish"],"_bbp_topic_id":["302982"],"_bbp_forum_id":["27814"],"_bbp_engagement":["3136","290865","292063"],"_bbp_voice_count":["3"],"_bbp_reply_count":["12"],"_bbp_last_reply_id":["304231"],"_bbp_last_active_id":["304231"],"_bbp_last_active_time":["2023-08-31 00:38:54"]},"test":"qalomari2huskers-unl-edu"}],"_links":{"self":[{"href":"https:\/\/innovationspace.ansys.com\/forum\/wp-json\/wp\/v2\/topics\/302982","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\/302982\/revisions"}],"wp:attachment":[{"href":"https:\/\/innovationspace.ansys.com\/forum\/wp-json\/wp\/v2\/media?parent=302982"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}