{"id":162205,"date":"2023-01-25T07:34:37","date_gmt":"2023-01-25T07:34:37","guid":{"rendered":"\/knowledge\/forums\/topic\/is-viscoelasticity-tbprony-equivalent-to-frequency-dependent-structural-damping-tbsdamp-in-a-harmonic-response-analysis-2\/"},"modified":"2023-07-31T12:36:34","modified_gmt":"2023-07-31T12:36:34","slug":"is-viscoelasticity-tbprony-equivalent-to-frequency-dependent-structural-damping-tbsdamp-in-a-harmonic-response-analysis-2","status":"publish","type":"topic","link":"https:\/\/innovationspace.ansys.com\/knowledge\/forums\/topic\/is-viscoelasticity-tbprony-equivalent-to-frequency-dependent-structural-damping-tbsdamp-in-a-harmonic-response-analysis-2\/","title":{"rendered":"Is viscoelasticity (TB,PRONY) equivalent to frequency-dependent structural damping (TB,SDAMP) in a harmonic response analysis?"},"content":{"rendered":"<p>It is possible to define complex moduli with TB,PRONY that gives the same displacement response as frequency-dependent stiffness (TB,ELASTIC) and damping (TB,SDAMP).  However, the stress results will differ since viscoelasticity considers the complex moduli in its stress calculations &#8211; in the ANSYS Help Viewer, see Section 4.7.3.4 &#8220;Stress&#8221; in &#8220;Mechanical APDL > Material Reference > 4. Nonlinear Material Properties > 4.7 Viscoelasticity > 4.7.3 Harmonic Viscoelasticity&#8221; for details.  With frequency-dependent stiffness and damping, the elastic modulus is considered to be a real quantity, so there will not be any phase difference between stress and strain.<\/p>\n","protected":false},"template":"","class_list":["post-162205","topic","type-topic","status-publish","hentry","topic-tag-17-2","topic-tag-harmonic","topic-tag-mechanical-apdl","topic-tag-modal-harmonic-response","topic-tag-structural-dynamics","topic-tag-structural-mechanics","topic-tag-viscoelasticity"],"aioseo_notices":[],"acf":[],"custom_fields":[{"0":{"_wp_page_template":["default"],"_bbp_forum_id":["27792"],"_bbp_last_active_time":["1-24-2023  20:20:11"],"_bbp_author_ip":["23.56.168.180"],"_btv_view_count":["1027"],"siebel_km_number":["2043165"],"product_version":["17.2"],"km_published_date":["2016-09-12T00:33:46.000Z"],"family":["Structural Mechanics"],"application_name":["Mechanical APDL"]},"test":"articlesansys-com"}],"_links":{"self":[{"href":"https:\/\/innovationspace.ansys.com\/knowledge\/wp-json\/wp\/v2\/topics\/162205","targetHints":{"allow":["GET"]}}],"collection":[{"href":"https:\/\/innovationspace.ansys.com\/knowledge\/wp-json\/wp\/v2\/topics"}],"about":[{"href":"https:\/\/innovationspace.ansys.com\/knowledge\/wp-json\/wp\/v2\/types\/topic"}],"version-history":[{"count":0,"href":"https:\/\/innovationspace.ansys.com\/knowledge\/wp-json\/wp\/v2\/topics\/162205\/revisions"}],"wp:attachment":[{"href":"https:\/\/innovationspace.ansys.com\/knowledge\/wp-json\/wp\/v2\/media?parent=162205"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}