{"id":427267,"date":"2025-03-28T20:09:44","date_gmt":"2025-03-28T20:09:44","guid":{"rendered":"https:\/\/innovationspace.ansys.com\/forum\/forums\/topic\/thermal-stress-cycling-analysis\/"},"modified":"2025-03-28T20:09:44","modified_gmt":"2025-03-28T20:09:44","slug":"thermal-stress-cycling-analysis","status":"publish","type":"topic","link":"https:\/\/innovationspace.ansys.com\/forum\/forums\/topic\/thermal-stress-cycling-analysis\/","title":{"rendered":"Thermal Stress cycling analysis"},"content":{"rendered":"

<p class=”MsoNormal”><span lang=”EN-US” style=”mso-ansi-language: EN-US;”>Hello Friends, <\/span><\/p><p class=”MsoNormal”><span lang=”EN-US” style=”mso-ansi-language: EN-US;”>I am solving a case, where I want to cycle the thermal loads 3 times(Hot to Ambient to Hot …so on), Like start-up shutdown scenario. I am using a NL material (BKIN) model to see accumulation of plastic strains at the end of these cycles. I am starting with 2 load step approach in ANSYS simulating 1 full cycle. If this works, I will cycle it as many times as I want.<\/span><\/p><p class=”MsoNormal”><span lang=”EN-US” style=”mso-ansi-language: EN-US;”>Now, I have a steady state thermal result which captures the hot condition ( The components are majorly in 400 deg C range .. but a small region is experiencing about 900 deg C). I am importing this load into my static structural at step1 as HOT CONDITION. <\/span><\/p><p class=”MsoNormal”><span lang=”EN-US” style=”mso-ansi-language: EN-US;”>Now for step 2 (COLD CONDITON), which is when the whole system cools down to ambient condition (25 deg C). I don’t have any steady state solution for this because the whole assembly is at 25 deg C. So, I am applying a direct temperature BC (25deg C) at step 2 on the full assembly. <\/span><\/p><p class=”MsoNormal”><span lang=”EN-US” style=”mso-ansi-language: EN-US;”>Please note, I am deactivating the imported temperature in Step2 and similarly the deactivating temperature BC (25 deg C) in step 1. <\/span><\/p><p class=”MsoNormal”><span lang=”EN-US” style=”mso-ansi-language: EN-US;”>Now the load step 1 solves very smoothly. But when the solution enters LS 2, I am getting as element distortion ERROR and solution stops. I checked the last saves solution and the elements in the 900deg C region are getting highly distorted probably because the temp. is jumping from 900 deg C to 25 degC. I am already using very small sub-steps. <\/span><\/p><p class=”MsoNormal”><span lang=”EN-US” style=”mso-ansi-language: EN-US;”>Does anyone in the here have any better ideas how I can Solve this problem. Is there anything which I am missing ?<\/span><\/p><\/p>\n","protected":false},"template":"","class_list":["post-427267","topic","type-topic","status-publish","hentry","topic-tag-mechanicalworkbench-1"],"aioseo_notices":[],"acf":[],"custom_fields":[{"0":{"_bbp_forum_id":["27791"],"_bbp_topic_id":["427267"],"_bbp_subscription":["475958","79"],"_bbp_author_ip":["167.103.7.22"],"_bbp_last_reply_id":["427446"],"_bbp_last_active_id":["427446"],"_bbp_last_active_time":["2025-03-31 19:05:51"],"_bbp_reply_count":["1"],"_bbp_reply_count_hidden":["0"],"_bbp_voice_count":["2"],"_bbp_engagement":["475958","79"],"_btv_view_count":["177"],"_bbp_topic_status":["unanswered"]},"test":"factooaairproducts-com"}],"_links":{"self":[{"href":"https:\/\/innovationspace.ansys.com\/forum\/wp-json\/wp\/v2\/topics\/427267","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\/427267\/revisions"}],"wp:attachment":[{"href":"https:\/\/innovationspace.ansys.com\/forum\/wp-json\/wp\/v2\/media?parent=427267"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}