{"id":167873,"date":"2022-03-29T14:04:31","date_gmt":"2022-03-29T14:04:31","guid":{"rendered":"\/forum\/forums\/topic\/fatigue-analysis-which-stress\/"},"modified":"2022-03-29T21:23:10","modified_gmt":"2022-03-29T21:23:10","slug":"fatigue-analysis-which-stress","status":"closed","type":"topic","link":"https:\/\/innovationspace.ansys.com\/forum\/forums\/topic\/fatigue-analysis-which-stress\/","title":{"rendered":"Fatigue Analysis &#8212; Which stress?"},"content":{"rendered":"<div class=\"Item-Body\">\n<div class=\"Message userContent\">\n<p>Hello!<\/p>\n<p>I&#039;m doing a fatigue analysis, not the Fatigue Tool in Ansys, but a predefined fatigue method (&quot;hand calculations&quot;) where we use stresses from the static analysis in Ansys as input. It is ductile materials (aluminium alloys and stainless steels). I&#039;m wondering which stress that is the most correct to examine since it&#039;s not defined in the fatigue method. <\/p>\n<p>I&#039;ve read in other forums that Von Mises Stress be used for static analysis of ductile materials in general and that max principal stress can be used for brittle materials and for example only torque load. But regarding Fatigue Analysis it seems that the opinions differ, even though it seems that most recommend Max Principal Stress, for example: <\/p>\n<p><a href=\"https:\/\/www.eng-tips.com\/viewthread.cfm?qid=123897\" rel=\"nofollow\">https:\/\/www.eng-tips.com\/viewthread.cfm?qid=123897<\/a>, <\/p>\n<p><a href=\"https:\/\/www.fatec-engineering.com\/2018\/10\/19\/principal-stresses-vs-equivalent-stresses-in-fatigue\/\" rel=\"nofollow\">https:\/\/www.fatec-engineering.com\/2018\/10\/19\/principal-stresses-vs-equivalent-stresses-in-fatigue\/<\/a>, <\/p>\n<p><a href=\"http:\/\/fatiguetoolbox.org\/fatlab\/documentation\/theory-reference\" rel=\"nofollow\">http:\/\/fatiguetoolbox.org\/fatlab\/documentation\/theory-reference<\/a> &quot;This is probably the most commonly used fatigue effective stress and is therefore used as default. It is not fool-proof for multiaxial loading though&quot;<\/p>\n<p>So the question is <strong>Which stress should be examined for a Fatigue Analysis? Von Mises, Max Principal Stress, other or the favorite one &quot;it depends&quot;? <\/strong><\/p>\n<p>Thank you for your support!<\/p>\n","protected":false},"template":"","class_list":["post-167873","topic","type-topic","status-closed","hentry","topic-tag-fatigue","topic-tag-fatigue-analysis","topic-tag-fatiguefailure-1","topic-tag-max-principal-stress","topic-tag-von-mises-stress"],"aioseo_notices":[],"acf":[],"custom_fields":[{"0":{"_btv_view_count":["3874"],"_bbp_likes_count":["0"],"_bbp_subscription":["25148"],"_bbp_topic_status":["unanswered"],"_bbp_status":["publish"],"_bbp_topic_id":["167873"],"_bbp_forum_id":["27791"],"_bbp_engagement":["25148","252374"],"_bbp_voice_count":["2"],"_bbp_reply_count":["1"],"_bbp_last_reply_id":["210059"],"_bbp_last_active_id":["210059"],"_bbp_last_active_time":["2022-03-29 21:23:10"]},"test":"albin-linderstamsaabgroup-com"}],"_links":{"self":[{"href":"https:\/\/innovationspace.ansys.com\/forum\/wp-json\/wp\/v2\/topics\/167873","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\/167873\/revisions"}],"wp:attachment":[{"href":"https:\/\/innovationspace.ansys.com\/forum\/wp-json\/wp\/v2\/media?parent=167873"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}