{"id":186393,"date":"2021-07-26T13:43:09","date_gmt":"2021-07-26T13:43:09","guid":{"rendered":"\/forum\/forums\/reply\/186393\/"},"modified":"2021-07-26T13:43:09","modified_gmt":"2021-07-26T13:43:09","slug":"186393","status":"publish","type":"reply","link":"https:\/\/innovationspace.ansys.com\/forum\/forums\/reply\/186393\/","title":{"rendered":"Reply To: quasi static compression test"},"content":{"rendered":"<p>Dear <a href=\"\/forum\/profile\/ram_gopisetti\" target=\"blank\">ram_gopisett<\/a><br \/>\nMay I ask you to do a favor for me?  to guide me step by step to solve my problem, I want to be sure that I am going it correctly. <br \/>\n2.At first, I defined my material. I extract the true stress and true strain from tensile test data. and add them as a Multilinear Isotropic Hardening. <br \/>\nI read that, If we want to use LS-Dyna for simulation and use Johnson cook failure criteria, we have to use the plasticity and failure criteria the same. I mean both of them should be based on Johnson cook. Is it true? Because here I used Multilinear Isotropic Hardening and Johnson cook failure as the below image :<br \/>\nI have a question about &#8220;Reference Strain Rate&#8221;,  should I use ZERO?  because I have just three damage constant. and melting temperature is important?<br \/>\n<img loading=\"lazy\" decoding=\"async\" src=\"\/forum\/wp-content\/uploads\/forum-uploads\/496\/5VI48YS2O9F5.png\" width=\"1275\" height=\"861\" \/><br \/>\n2.But here before starting to do anything ansys gives me an error that:<br \/>\n<img loading=\"lazy\" decoding=\"async\" src=\"\/forum\/wp-content\/uploads\/forum-uploads\/391\/JDAZ9ILF1DEH.png\" width=\"412\" height=\"173\" \/><br \/>\nIf I clean 22 from temperature, it shows me this error again. I searched for this error but I could not find anything to how can I solve it. Please guide me.<br \/>\n3.I import my geometry and meshed it. In both mesh and body size, I added &#8220;0.003 mm&#8221; as the size of elements; and meshed it. should I use this size to calculate CFL?<br \/>\n4.the main problem for me is related to Analysis settings. Can you help me to fill it?<\/p>\n<p>I found CFL from a video in Ansys youtube and  it is defined by the below equation <br \/>\n<img loading=\"lazy\" decoding=\"async\" src=\"\/forum\/wp-content\/uploads\/forum-uploads\/462\/YR6AELZ24LC5.png\" width=\"547\" height=\"551\" \/><br \/>\nI calculated my CFL time and it is equal to 5.31e-7. I should mention it I consider f=1 in the above equation. is it true?<br \/>\nCan you guid me about :<br \/>\nNumber of steps?<br \/>\nInitial, minimum and maximum time steps?<br \/>\nEnd time ?<br \/>\nStatic Dampin ?<\/p>\n<p>Thank you. dear @<a href=\"\/forum\/profile\/ram_gopisetti\" target=\"blank\">ram_gopisett<\/a>.<\/p>\n<p><\/p>\n","protected":false},"template":"","class_list":["post-186393","reply","type-reply","status-publish","hentry"],"aioseo_notices":[],"acf":[],"_links":{"self":[{"href":"https:\/\/innovationspace.ansys.com\/forum\/wp-json\/wp\/v2\/replies\/186393","targetHints":{"allow":["GET"]}}],"collection":[{"href":"https:\/\/innovationspace.ansys.com\/forum\/wp-json\/wp\/v2\/replies"}],"about":[{"href":"https:\/\/innovationspace.ansys.com\/forum\/wp-json\/wp\/v2\/types\/reply"}],"version-history":[{"count":0,"href":"https:\/\/innovationspace.ansys.com\/forum\/wp-json\/wp\/v2\/replies\/186393\/revisions"}],"wp:attachment":[{"href":"https:\/\/innovationspace.ansys.com\/forum\/wp-json\/wp\/v2\/media?parent=186393"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}