{"id":30399,"date":"2018-09-13T13:24:03","date_gmt":"2018-09-13T13:24:03","guid":{"rendered":"\/forum\/forums\/topic\/comparing-stresses-from-modal-analysis-and-static-analysis\/"},"modified":"2024-05-06T02:57:21","modified_gmt":"2024-05-06T02:57:21","slug":"comparing-stresses-from-modal-analysis-and-static-analysis","status":"closed","type":"topic","link":"https:\/\/innovationspace.ansys.com\/forum\/forums\/topic\/comparing-stresses-from-modal-analysis-and-static-analysis\/","title":{"rendered":"Comparing stresses from modal analysis and static analysis"},"content":{"rendered":"

Hello everyone,<\/span><\/p>\n

<\/p>\n

For my master thesis, I use the Mechanical APDL 15.0 with the help of which I would like to carry out a static or modal analysis of a piston rod.<\/span><\/p>\n

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My goal is to get the stresses at the nodes for the elements and modes of the piston rod.<\/span><\/p>\n

<\/p>\n

I define a txt. script with the necessary conditions to perform a modal analysis.<\/span><\/p>\n

<\/p>\n

ANSYS returns the nodal stresses.<\/span><\/p>\n

<\/p>\n

Now I would like to choose an alternative way for getting the stresses (in order to check if the stresses are equal):<\/span><\/p>\n

<\/p>\n

a static analysis with defining the shifts as constraints with the “d” command of the respective modes.<\/span><\/p>\n

<\/p>\n

If I choose the way of the static analysis, the values for the nodal stresses are different then the nodal stresses I got with the modal analysis.<\/span><\/p>\n

<\/p>\n

How can this be?<\/span><\/p>\n

<\/p>\n

Is this a constant factor between these two values of the modal analysis and the static analysis that ANSYS always includes in the calculation?<\/span><\/p>\n

<\/p>\n

And if so, how is this factor to be identified? How are nodal stresses normalized in ANSYS?<\/span><\/p>\n

<\/p>\n

Best regards<\/span><\/p>\n

<\/p>\n

Katerina<\/span><\/p>\n","protected":false},"template":"","class_list":["post-30399","topic","type-topic","status-closed","hentry"],"aioseo_notices":[],"acf":[],"custom_fields":[{"0":{"_bbp_old_topic_id":["2569"],"_bbp_old_topic_author_name_id":["Anonymous"],"_bbp_old_is_topic_anonymous_id":["false"],"_bbp_old_closed_status_id":["publish"],"_bbp_author_ip":[null],"_bbp_old_sticky_status_id":["normal"],"_bbp_likes_count":["0","0","0","0","0"],"_btv_view_count":["4431"],"_bbp_topic_status":["answered"],"_bbp_status":["publish"],"_bbp_topic_id":["30399"],"_bbp_forum_id":["27789"],"_bbp_engagement":["240","2302","158799","164971","173568","174629","181699","185255"],"_bbp_voice_count":["8"],"_bbp_last_reply_id":["225836"],"_bbp_last_active_id":["225836"],"_bbp_last_active_time":["2021-09-28 10:37:50"]},"test":"katerina"}],"_links":{"self":[{"href":"https:\/\/innovationspace.ansys.com\/forum\/wp-json\/wp\/v2\/topics\/30399","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":1,"href":"https:\/\/innovationspace.ansys.com\/forum\/wp-json\/wp\/v2\/topics\/30399\/revisions"}],"predecessor-version":[{"id":365593,"href":"https:\/\/innovationspace.ansys.com\/forum\/wp-json\/wp\/v2\/topics\/30399\/revisions\/365593"}],"wp:attachment":[{"href":"https:\/\/innovationspace.ansys.com\/forum\/wp-json\/wp\/v2\/media?parent=30399"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}