How can I define a cylindrical coordinate system in ANSYS mechanical where the radial coordinate is the z axis in the cylindrical system? I am trying to model a homogenized composite system where the radial component is lower effective modulus than the z and theta (which are equal). When I try to run the model using the x direction as the radial component (conventional cylindrical system), I get an error for the elasticity matrix not being positive definite. I can make the matrix positive definite by switching z and x, but I do not see a way in mechanical to orient a cylindrical coordinate system such that it considers z to be the radial component. Perhaps this can be done with APDL commands. Alternatively, I’m open to suggestions for making the matrix positive definite with x as the lower modulus direction, but I don’t see this as as possibility as this is a more fundamental constraint as opposed to the axis definition which I understand to be arbitrary.<\/p>\n
Thanks for any help you can give<\/p>\n","protected":false},"template":"","class_list":["post-246748","topic","type-topic","status-closed","hentry","topic-tag-ansysmechanical","topic-tag-complex-youngs-modulus","topic-tag-cylindrical-coordinates","topic-tag-elastic-modulus-1"],"aioseo_notices":[],"acf":[],"custom_fields":[{"0":{"_bbp_subscription":["223104","50680"],"_bbp_author_ip":["96.7.74.191"]," _bbp_last_reply_id":["0"]," _bbp_likes_count":["0"],"_btv_view_count":["2791"],"_edit_lock":["1673983018:128205"],"_bbp_topic_status":["unanswered"],"_bbp_status":["publish"],"_bbp_topic_id":["246748"],"_bbp_forum_id":["27791"],"_bbp_engagement":["50680","223104"],"_bbp_voice_count":["2"],"_bbp_reply_count":["3"],"_bbp_last_reply_id":["246931"],"_bbp_last_active_id":["246931"],"_bbp_last_active_time":["2023-01-18 17:23:42"]},"test":"kyleschnandrew-cmu-edu"}],"_links":{"self":[{"href":"https:\/\/innovationspace.ansys.com\/forum\/wp-json\/wp\/v2\/topics\/246748","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\/246748\/revisions"}],"wp:attachment":[{"href":"https:\/\/innovationspace.ansys.com\/forum\/wp-json\/wp\/v2\/media?parent=246748"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}