{"id":369134,"date":"2024-05-29T20:08:44","date_gmt":"2024-05-29T20:08:44","guid":{"rendered":"\/forum\/forums\/topic\/transient-and-static-strain-analysis-different-result\/"},"modified":"2024-05-29T20:08:44","modified_gmt":"2024-05-29T20:08:44","slug":"transient-and-static-strain-analysis-different-result","status":"closed","type":"topic","link":"https:\/\/innovationspace.ansys.com\/forum\/forums\/topic\/transient-and-static-strain-analysis-different-result\/","title":{"rendered":"Transient and Static strain analysis &#8211; different result"},"content":{"rendered":"<p>I am currently doing a transient response, and view the Timehistory strain in Ansys APDL based on a shell181 element.&nbsp;<\/p>\n<p>The shape is a hollow cylinder, and it is fixed in one end. When i take the transient z-direction strain i notice that the value does not correspond to the difference between the z-displacement difference divided by the length between the nodes (see formula in picture #1 + see transient strain response in picture #2).&nbsp;<\/p>\n<p>However, when a similar analysis is done with the same forces in a static analysis, then the strain correspond to the upper and lower z-displacement difference divided by the length. It seems like the transient response time history has a scale difference on 3.4, but it still has the same z-displacements, when the static state in picture #2 is reached. &nbsp;What causes the strain the strain formula to be correct for the static case and not the transient case? Maybe i use the wrong transient settings?<\/p>\n<p>The transient response uses these settings in APDL:<br \/>\/SOL &nbsp; &nbsp; &nbsp; &nbsp;! Enter the solution module<br \/>ANTYPE, 4 &nbsp; &nbsp;! Analysis type: Transient<br \/>TRNOPT,FULL ! Solution method<br \/>LUMPM,0 &nbsp; &nbsp; ! Lumped mass approximation<\/p>\n<p>OUTRES,ERASE<br \/>OUTRES,NSOL,LAST<\/p>\n<p>DELTIM,1 &nbsp; &nbsp; &nbsp; &nbsp;! Time step size<br \/>TIME,StartTime &nbsp; &nbsp;! Start time<br \/>MIDTOL,0,0,1 &nbsp; &nbsp;! Include response frequency<br \/>TINTP,0.005 &nbsp; &nbsp; ! Amplitude decay option, 0.5% damping<br \/>LSWRITE,1, &nbsp;! Write &#8216;LoadStep&#8217; file 1<\/p>\n<p><img loading=\"lazy\" decoding=\"async\" src=\"\/forum\/wp-content\/uploads\/sites\/2\/2024\/05\/29-05-2024-1717012963-ansys_transient.PNG\" alt=\"\" width=\"923\" height=\"510\"><img loading=\"lazy\" decoding=\"async\" src=\"\/forum\/wp-content\/uploads\/sites\/2\/2024\/05\/29-05-2024-1717013004-ansys_transient2.PNG\" alt=\"\" width=\"673\" height=\"507\"><\/p>\n","protected":false},"template":"","class_list":["post-369134","topic","type-topic","status-closed","hentry","topic-tag-ANSYSTransient-1","topic-tag-apdl-ansys-1","topic-tag-elasticstrain-1","topic-tag-static","topic-tag-transient"],"aioseo_notices":[],"acf":[],"custom_fields":[{"0":{"_bbp_subscription":["349964","20905"],"_bbp_author_ip":["23.216.133.166"]," _bbp_last_reply_id":["0"]," _bbp_likes_count":["0"],"_btv_view_count":["486"],"_bbp_topic_status":["unanswered"],"_bbp_likes_count":["1"],"_bbp_topic_id":["369134"],"_bbp_forum_id":["27796"],"_bbp_engagement":["20905","349964"],"_bbp_voice_count":["2"],"_bbp_reply_count":["1"],"_bbp_last_reply_id":["370735"],"_bbp_last_active_id":["370735"],"_bbp_last_active_time":["2024-07-05 14:30:32"]},"test":"s214863dtu-dk"}],"_links":{"self":[{"href":"https:\/\/innovationspace.ansys.com\/forum\/wp-json\/wp\/v2\/topics\/369134","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\/369134\/revisions"}],"wp:attachment":[{"href":"https:\/\/innovationspace.ansys.com\/forum\/wp-json\/wp\/v2\/media?parent=369134"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}